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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2017	Jul. 31, 2017
Document Information [Line Items]
Entity Registrant Name	CASELLA WASTE SYSTEMS INC
Entity Central Index Key	0000911177
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
Amendment Flag	false
Trading Symbol	CWST
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		41,047,965
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		988,200

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 2,685	$ 2,544
Accounts receivable - trade, net of allowance for doubtful accounts $601 and $1,069, respectively	65,766	61,196
Refundable income taxes	718	654
Prepaid expenses	7,208	7,989
Inventory	5,309	4,915
Other current assets	967	1,290
Total current assets	82,653	78,588
Property, plant, and equipment, net of accumulated depreciation and amortization of $865,595 and $837,122, respectively	349,345	398,466
Goodwill	121,700	119,899
Intangible assets, net	8,169	7,696
Restricted assets	1,065	1,002
Cost method investments	12,333	12,333
Other non-current assets	13,612	13,528
Total assets	588,877	631,512
CURRENT LIABILITIES:
Current maturities of long-term debt and capital leases	5,016	4,686
Accounts payable	43,539	44,997
Accrued payroll and related expenses	5,910	12,505
Accrued interest	2,039	4,654
Current accrued capping, closure and post-closure costs	943	668
Other accrued liabilities	20,597	14,916
Total current liabilities	78,044	82,426
Long-term debt and capital leases, less current portion	497,592	503,961
Accrued capping, closure and post-closure costs, less current portion	55,804	43,539
Deferred income taxes	6,462	6,178
Other long-term liabilities	25,608	19,958
COMMITMENTS AND CONTINGENCIES
Casella Waste Systems, Inc. stockholders' deficit
Additional paid-in capital	352,441	348,434
Accumulated deficit	(427,208)	(373,308)
Accumulated other comprehensive loss	(286)	(68)
Total Casella Waste Systems, Inc. stockholders' deficit	(74,633)	(24,526)
Noncontrolling interests	0	(24)
Total stockholders' deficit	(74,633)	(24,550)
Total liabilities and stockholders' deficit	588,877	631,512
Class A Common Stock
Casella Waste Systems, Inc. stockholders' deficit
Common stock	410	406
Class B Common Stock
Casella Waste Systems, Inc. stockholders' deficit
Common stock	$ 10	$ 10

CONSOLIDATED BALANCE SHEETS (Parenthetical) $ in Thousands	Jun. 30, 2017 USD ($) vote $ / shares shares	Dec. 31, 2016 USD ($) vote $ / shares shares
Accounts receivable - trade, allowance for doubtful accounts \| $	$ 601	$ 1,069
Property, plant and equipment, accumulated depreciation and amortization \| $	$ 783,128	$ 837,122
Class A Common Stock
Common stock, par value (in USD per share) \| $ / shares	$ 0.01	$ 0.01
Common stock, authorized shares (in shares)	100,000,000	100,000,000
Common stock, issued shares (in shares)	41,042,000	40,572,000
Common stock, outstanding shares (in shares)	41,042,000	40,572,000
Class B Common Stock
Common stock, par value (in USD per share) \| $ / shares	$ 0.01	$ 0.01
Common stock, authorized shares (in shares)	1,000,000	1,000,000
Common stock, issued shares (in shares)	988,000	988,000
Common stock, outstanding shares (in shares)	988,000	988,000
Common stock, votes (in votes per share) \| vote	10	10

CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenues	$ 154,016	$ 144,670	$ 287,818	$ 270,103
Operating expenses:
Cost of operations	102,519	95,188	197,063	185,606
General and administration	18,794	18,084	37,638	36,672
Depreciation and amortization	15,868	15,802	29,717	30,255
Southbridge landfill closure charge	64,114	0	64,114	0
Total operating expenses	201,295	129,074	328,532	252,533
Operating (loss) income	(47,279)	15,596	(40,714)	17,570
Other expense (income):
Interest income	(52)	(60)	(121)	(164)
Interest expense	6,334	10,004	12,784	20,034
Loss on debt extinguishment	46	593	517	545
Other income	(326)	(363)	(405)	(504)
Other expense, net	6,002	10,174	12,775	19,911
(Loss) income before income taxes	(53,281)	5,422	(53,489)	(2,341)
Provision for income taxes	394	230	411	81
Net (loss) income	(53,675)	5,192	(53,900)	(2,422)
Less: Net loss attributable to noncontrolling interests	0	(3)	0	(9)
Net (loss) income attributable to common stockholders	$ (53,675)	$ 5,195	$ (53,900)	$ (2,413)
Basic earnings per share attributable to common stockholders:
Weighted average common shares outstanding (in shares)	41,811	41,132	41,698	41,064
Basic earnings per common share (in dollars per share)	$ (1.28)	$ 0.13	$ (1.29)	$ (0.06)
Diluted earnings per share attributable to common stockholders:
Weighted average common shares outstanding (in shares)	41,811	41,598	41,698	41,064
Diluted earnings per common share (in dollars per share)	$ (1.28)	$ 0.12	$ (1.29)	$ (0.06)

CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (53,675)	$ 5,192	$ (53,900)	$ (2,422)
Hedging activity:
Interest rate swap settlements	(149)	0	(194)	0
Interest rate swap amounts reclassified into interest expense	138	0	208	0
Unrealized loss resulting from changes in fair value of derivative instruments	(212)	0	(278)	0
Unrealized gain (loss) resulting from changes in fair value of marketable securities	23	44	46	(39)
Other comprehensive (loss) income, before tax	(200)	44	(218)	(39)
Income tax expense related to items of other comprehensive loss	0	0	0	0
Other comprehensive (loss) income, net of tax	(200)	44	(218)	(39)
Comprehensive (loss) income	(53,875)	5,236	(54,118)	(2,461)
Less: Comprehensive loss attributable to noncontrolling interests	0	(3)	0	(9)
Comprehensive (loss) income attributable to common stockholders	$ (53,875)	$ 5,239	$ (54,118)	$ (2,452)

CONSOLIDATED STATEMENT OF STOCKHOLDERS' DEFICIT (Unaudited) - 6 months ended Jun. 30, 2017 - USD ($) shares in Thousands, $ in Thousands	Total	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Noncontrolling Interests	Class A Common Stock	Class A Common Stock Common Stock	Class B Common Stock	Class B Common Stock Common Stock
Beginning balance at Dec. 31, 2016	$ (24,550)	$ 348,434	$ (373,308)	$ (68)	$ (24)		$ 406		$ 10
Beginning balance (in shares) at Dec. 31, 2016						40,572	40,572	988	988
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(53,900)		(53,900)		0
Other comprehensive loss	(218)			(218)
Issuances of Class A common stock	1,099	1,095					$ 4
Issuances of Class A common stock (in shares)							470
Stock-based compensation	2,912	2,912
Other	24				24
Ending balance at Jun. 30, 2017	$ (74,633)	$ 352,441	$ (427,208)	$ (286)	$ 0		$ 410		$ 10
Ending balance (in shares) at Jun. 30, 2017						41,042	41,042	988	988

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash Flows from Operating Activities:
Net loss	$ (53,900)	$ (2,422)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	29,717	30,255
Depletion of landfill operating lease obligations	4,173	4,443
Interest accretion on landfill and environmental remediation liabilities	1,939	1,782
Amortization of debt issuance costs and discount on long-term debt	1,320	2,079
Stock-based compensation	2,912	1,622
Gain on sale of property and equipment	(97)	(520)
Southbridge landfill non-cash closure charge	63,526	0
Loss on debt extinguishment	517	545
Deferred income taxes	284	303
Changes in assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable	(4,570)	(916)
Accounts payable	(1,458)	1,116
Prepaid expenses, inventories and other assets	517	(782)
Accrued expenses and other liabilities	(4,871)	(1,920)
Net cash provided by operating activities	40,009	35,585
Cash Flows from Investing Activities:
Acquisitions, net of cash acquired	(2,694)	(2,439)
Acquisition related additions to property, plant and equipment	(176)	(38)
Additions to property, plant and equipment	(24,372)	(23,460)
Payments on landfill operating lease contracts	(3,177)	(3,326)
Proceeds from sale of property and equipment	382	957
Net cash used in investing activities	(30,037)	(28,306)
Cash Flows from Financing Activities:
Proceeds from long-term borrowings	117,000	126,000
Principal payments on long-term debt	(126,238)	(132,716)
Payments of debt issuance costs	(1,451)	(682)
Payments of debt extinguishment costs	0	(310)
Proceeds from the exercise of share based awards	858	0
Change in restricted cash	0	499
Net cash used in financing activities	(9,831)	(7,209)
Net increase in cash and cash equivalents	141	70
Cash and cash equivalents, beginning of period	2,544	2,312
Cash and cash equivalents, end of period	2,685	2,382
Cash paid during the period for:
Interest	14,079	18,394
Income taxes, net of refunds	189	203
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Non-current assets obtained through long-term obligations	$ 2,813	$ 866

BASIS OF PRESENTATION	6 Months Ended
BASIS OF PRESENTATION	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION Casella Waste Systems, Inc. (“Parent”), and its consolidated subsidiaries (collectively, “we”, “us” or “our”), is a regional, vertically integrated solid waste services company that provides collection, transfer, disposal, landfill, landfill gas-to-energy, recycling and organics services in the northeastern United States. We market recyclable metals, aluminum, plastics, paper and corrugated cardboard, which have been processed at our recycling facilities, as well as recyclables purchased from third-parties. We manage our solid waste operations on a geographic basis through two regional operating segments, the Eastern and Western regions, each of which provides a full range of solid waste services, and our larger-scale recycling and commodity brokerage operations through our Recycling segment. Organics services, ancillary operations, major account and industrial services, discontinued operations and earnings from equity method investees, as applicable, are included in our Other segment. The accompanying unaudited consolidated financial statements, which include the accounts of the Parent, our wholly-owned subsidiaries and any partially owned entities over which we have a controlling financial interest, have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). All significant intercompany accounts and transactions are eliminated in consolidation. Investments in entities in which we do not have a controlling financial interest are accounted for under either the equity method or the cost method of accounting, as appropriate. Our significant accounting policies are more fully discussed in Item 8 of our Annual Report on Form 10-K for the fiscal year ended December 31, 2016, which was filed with the SEC on March 2, 2017. Preparation of our consolidated financial statements in accordance with GAAP requires management to make certain estimates and assumptions. These estimates and assumptions affect the accounting for and recognition and disclosure of assets, liabilities, equity, revenues and expenses. We must make these estimates and assumptions because certain information that we use is dependent on future events, cannot be calculated with a high degree of precision given the available data, or simply cannot be readily calculated. In the opinion of management, these consolidated financial statements include all adjustments, which include normal recurring and nonrecurring adjustments, necessary for a fair presentation of the financial position, results of operations and cash flows for the periods presented. The results for the three and six months ended June 30, 2017 may not be indicative of the results for any other interim period or the entire fiscal year. The consolidated financial statements presented herein should be read in conjunction with our audited consolidated financial statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2016. Subsequent Events We have evaluated subsequent events or transactions that have occurred after the consolidated balance sheet date of June 30, 2017 through the date of filing of the consolidated financial statements with the SEC on this Quarterly Report on Form 10-Q. We have determined that there are no subsequent events that require disclosure in this Quarterly Report on Form 10-Q.

ACCOUNTING CHANGES

6 Months Ended

Jun. 30, 2017

Accounting Changes and Error Corrections [Abstract]

ACCOUNTING CHANGES

A table providing a brief description of recent Accounting Standards Updates (“ASU”) to the Accounting Standards Codification (“ASC”) issued by the Financial Accounting Standards Board (“FASB”) that may have a material effect on our consolidated financial statements upon adoption follows:



Standard	Description	Effect on the Financial Statements or Other Significant Matters
Accounting standards that are pending adoption
ASU 2017-09: Compensation - Stock Compensation (Topic 718)	Requires that an entity should account for the effects of a modification to an award unless all of the following conditions are met: the fair value of the modified award is the same as the fair value of the original award immediately before the original award is modified; the vesting conditions of the modified award are the same as the vesting conditions immediately before the original award is modified; and the classification of modified award as an equity instrument or a liability instrument is the same as the classification of the original award immediately before the original award is modified.	The adoption of this guidance could effect equity compensation expense and net income if there is a modification of an award. This guidance is effective January 1, 2018 with early adoption permitted.

ASU 2017-04: Intangibles - Goodwill and Other (Topic 350)	Requires that when an entity is performing its annual, or interim, goodwill impairment test, it should compare the fair value of the reporting unit with its carrying amount when calculating its impairment charge, noting that the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. Additionally, if applicable, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when calculating its impairment charge.	As of December 31, 2016, we did not record a goodwill impairment charge related to our annual goodwill impairment test because at that time the fair value of each reporting unit exceeded its respective carrying value. If the carrying value of any of these reporting units exceeds the fair value when we perform a goodwill impairment test, we would record an impairment charge equal to the amount by which the carrying value exceeds its fair value. This guidance is effective January 1, 2020 with early adoption permitted for interim or annual goodwill impairment tests performed after January 1, 2017.

ASU 2016-02: Leases (Topic 842)	Requires that a lessee recognize at the commencement date: a lease liability, which is the obligation of the lessee to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term.	We are currently assessing the provisions of this guidance and evaluating the timing and impact the guidance will have on our consolidated financial statements and related disclosures. We are also in the process of aggregating operating lease documentation for review. The adoption of this ASU primarily impacts the balance sheet through the recognition of a right-of-use asset and a lease liability for all leases with terms in excess of 12 months and currently classified as operating leases. This guidance is effective January 1, 2019 using a modified retrospective transition approach with early adoption permitted.

ASU 2016-01: Financial Instruments - Overall (Topic 825-10)	Requires the following: (1) equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income; (2) entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; (3) separate presentation of financial assets and financial liabilities by measurement category and form of financial asset; and (4) the elimination of the disclosure requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost.	The adoption of this guidance results in a cumulative-effect adjustment to the balance sheet, the recognition of changes in fair value of certain equity investments in net income, and enhanced disclosure. This guidance is effective January 1, 2018 with a cumulative-effect adjustment.

ASU 2014-09, as amended through May 2017: Revenue from Contracts with Customers (Topic 606)	The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.	We are currently evaluating the alternative methods of adoption and the effect of this guidance on our consolidated financial statements and related disclosures. To assess the impact of this standard, internal resources have reviewed the amended guidance and attended training to assist with the interpretation and implementation of the amended guidance. We have also consulted with outside resources to assist in applying and implementing this guidance. We are currently in the process of identifying, reviewing and documenting material contracts and revenue streams that are impacted by this guidance. This guidance is effective January 1, 2018 using a full or modified retrospective approach with early adoption permitted January 1, 2017.

- Definition

The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

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+ Details

BUSINESS COMBINATIONS

6 Months Ended

Jun. 30, 2017

Business Combinations [Abstract]

BUSINESS COMBINATIONS

We acquired one solid waste collection business in our Eastern region and one solid waste collection business in our Western region during the six months ended June 30, 2017. We acquired three transfer stations in our Western region during the three months ended June 30, 2016. The operating results of each acquired business is included in the accompanying unaudited consolidated statements of operations from the date of acquisition, and the purchase price has been allocated to the net assets acquired based on fair values at the date of acquisition, with the residual amount recorded as goodwill.

A summary of the purchase price for these acquisitions and the allocation of the purchase price for these acquisitions follows:



	Six Months Ended June 30,
	2017			2016
Purchase Price:
Cash paid for acquisitions	$	2,664		$	2,439
Notes payable	2,400			—
Other non-cash considerations	100			—
Holdbacks	196			400
Total	5,360			2,839
Allocated as follows:
Current assets	—			40
Land	—			353
Building	—			1,360
Equipment	2,291			269
Intangible assets	1,317			—
Other liabilities, net	(49		)	(106		)
Fair value of assets acquired and liabilities assumed	3,559			1,916
Excess purchase price allocated to goodwill	$	1,801		$	923

Unaudited pro forma combined information that shows our operational results as though each acquisition completed since the beginning of the prior fiscal year had occurred as of January 1, 2016 follows:



	Three Months Ended June 30,					Six Months Ended June 30,
	2017			2016		2017			2016
Revenue	$	154,729		$	145,911	$	289,715		$	273,408
Operating (loss) income	$	(47,273	)	$	15,625	$	(40,685	)	$	17,548
Net (loss) income attributable to common stockholders	$	(53,673	)	$	5,208	$	(53,889	)	$	(2,435	)
Basic weighted average common shares outstanding	41,811			41,132		41,698			41,064
Basic earnings per share attributable to common stockholders	$	(1.28	)	$	0.13	$	(1.29	)	$	(0.06	)
Diluted weighted average shares outstanding	41,811			41,598		41,698			41,064
Diluted earnings per share attributable to common stockholders	$	(1.28	)	$	0.13	$	(1.29	)	$	(0.06	)

The pro forma results set forth in the table above have been prepared for comparative purposes only and are not necessarily indicative of the actual results of operations had the acquisitions occurred as of January 1, 2016 or of the results of our future operations. Furthermore, the pro forma results do not give effect to all cost savings or incremental costs that may occur as a result of the integration and consolidation of the completed acquisitions.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1383-128463

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6996-128479

+ Details

GOODWILL AND INTANGIBLE ASSETS

6 Months Ended

Jun. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND INTANGIBLE ASSETS

A summary of the activity and balances related to goodwill by operating segment follows:



	December 31, 2016		Acquisitions		June 30, 2017
Eastern region	$	17,429	$	1,764	$	19,193
Western region	88,426		37		88,463
Recycling	12,315		—		12,315
Other	1,729		—		1,729
Total	$	119,899	$	1,801	$	121,700

A summary of intangible assets by intangible asset type follows:



	Covenants Not-to-Compete			Client Lists			Total
Balance, June 30, 2017
Intangible assets	$	17,941		$	17,189		$	35,130
Less accumulated amortization	(16,627		)	(10,334		)	(26,961		)
	$	1,314		$	6,855		$	8,169



	Covenants Not-to-Compete			Client Lists			Total
Balance, December 31, 2016
Intangible assets	$	17,594		$	16,071		$	33,665
Less accumulated amortization	(16,402		)	(9,567		)	(25,969		)
	$	1,192		$	6,504		$	7,696

Intangible amortization expense was $505 and $991 during the three and six months ended June 30, 2017, respectively, as compared to $519 and $1,043 during the three and six months ended June 30, 2016, respectively.

A summary of intangible amortization expense estimated for the five fiscal years following the fiscal year ended December 31, 2016 and thereafter follows:



Estimated Future Amortization Expense as of June 30, 2017
Fiscal year ending December 31, 2017	$	1,048
Fiscal year ending December 31, 2018	$	1,925
Fiscal year ending December 31, 2019	$	1,563
Fiscal year ending December 31, 2020	$	1,359
Fiscal year ending December 31, 2021	$	1,094
Thereafter	$	1,180

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE

6 Months Ended

Jun. 30, 2017

Asset Retirement Obligation Disclosure [Abstract]

ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE

Accrued final capping, closure and post-closure costs include the current and non-current portion of costs associated with obligations for final capping, closure and post-closure of our landfills. We estimate our future final capping, closure and post-closure costs in order to determine the final capping, closure and post-closure expense per ton of waste placed into each landfill. The anticipated time frame for paying these costs varies based on the remaining useful life of each landfill, as well as the duration of the post-closure monitoring period.

A summary of the changes to accrued final capping, closure and post-closure liabilities follows:



	Six Months Ended June 30,
	2017			2016
Beginning balance	$	44,207		$	41,041
Obligations incurred	1,310			1,143
Revisions in estimates (1)	9,598			(56		)
Accretion expense	1,939			1,782
Obligations settled (2)	(307		)	(432		)
Ending balance	$	56,747		$	43,478


(1)	Relates to changes in estimates and assumptions concerning anticipated waste flow, cost and timing of future final capping, closure and post-closure activities at our Southbridge landfill associated with the Southbridge landfill closure. See Note 8, Commitments and Contingencies and Note 11, Other Items and Charges for disclosure regarding the matter.


(2)	Includes amounts that are being processed through accounts payable as a part of our disbursement cycle.

OTHER ACCRUED LIABILITIES

6 Months Ended

Jun. 30, 2017

Other Liabilities Disclosure [Abstract]

OTHER ACCRUED LIABILITIES

A summary of other accrued liabilities, classified as current liabilities, follows:



	June 30, 2017		December 31, 2016
Self insurance reserve - current portion	$	4,229	$	3,836
Other accrued liabilities	16,368		11,080
Total other accrued liabilities	$	20,597	$	14,916

LONG-TERM DEBT

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

LONG-TERM DEBT

A summary of long-term debt and capital leases by debt instrument follows:



	June 30, 2017		December 31, 2016
Senior Secured Credit Facility:
Revolving Credit Facility due October 2021; bearing interest at LIBOR plus 2.75% and 3.00%, respectively	$	55,600	$	62,600
Term Loan B Facility due October 2023; bearing interest at LIBOR plus 2.75% and 3.00%, respectively	348,250		350,000
Tax-Exempt Bonds:
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 due December 2044 - fixed rate interest period through 2019; bearing interest at 3.75%	25,000		25,000
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2 due December 2044 - fixed rate interest period through 2026; bearing interest at 3.125%	15,000		15,000
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3 due January 2025 - fixed rate interest period through 2025; bearing interest at 5.25%	25,000		—
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015 due August 2035 - fixed rate interest period through 2025; bearing interest at 5.125%	15,000		15,000
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 due April 2036 - fixed rate interest period through 2018; bearing interest at 4.75%	16,000		16,000
Business Finance Authority of the State of New Hampshire Solid Waste Disposal Revenue Bonds Series 2013 due April 2029 - fixed rate interest period through 2019; bearing interest at 4.00%	11,000		11,000
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-2 due January 2025 - fixed rate interest period through 2017; bore interest at 6.25%	—		21,400
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-1; letter of credit backed due January 2025 - bore interest at SIFMA Index	—		3,600
Other:
Capital leases maturing through April 2023; bearing interest at up to 7.70%	5,363		5,534
Notes payable maturing through June 2027; bearing interest at up to 7.00%	2,945		449
Principal amount of long-term debt and capital leases	519,158		525,583
Less—unamortized discount and debt issuance costs (1)	16,550		16,936
Long-term debt and capital leases less unamortized discount and debt issuance costs	502,608		508,647
Less—current maturities of long-term debt	5,016		4,686
	$	497,592	$	503,961


(1)	A summary of unamortized discount and debt issuance costs by debt instrument follows:



	June 30, 2017		December 31, 2016
Revolving Credit Facility	$	4,452	$	4,965
Term Loan B Facility (including unamortized discount of $1,598 and $1,712)	7,970		7,718
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014	1,128		1,221
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2	541		571
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3	645		—
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015	726		760
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013	589		605
Business Finance Authority of the State of New Hampshire Solid Waste Disposal Revenue Bonds Series 2013	499		563
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-1	—		31
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-2	—		502
	$	16,550	$	16,936

Financing Activities

Term Loan B Facility

In the three months ended June 30, 2017, we entered into the first amendment (“Repricing Amendment”) to our $350,000 aggregate principal amount term loan B facility ("Term Loan B Facility") and $160,000 revolving line of credit facility (“Revolving Credit Facility” and, together with the Term Loan B Facility, the "Credit Facility"). The Repricing Amendment decreased the applicable interest margin for our Term Loan B Facility by 25 basis points for both LIBOR borrowings and base rate borrowings. The applicable interest rate margin will continue to be determined based on our consolidated net leverage ratio, with the interest currently set at 2.75% for LIBOR borrowings (with a 1.00% LIBOR floor), and 1.75% for base rate borrowings. The applicable interest rate will be reduced to 2.50% for LIBOR borrowings (with a 1.00% LIBOR floor), and 1.50% for base rate borrowings upon us reaching a consolidated net leverage ratio of 3.75x or less.

Maine Bonds

In the quarter ended March 31, 2017, we completed the remarketing of $3,600 aggregate principal amount of Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-1 (“FAME Bonds 2005R-1”) and $21,400 aggregate principal amount of Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-2 (“FAME Bonds 2005R-2”) into one series of $25,000 aggregate principal amount Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3 (“FAME Bonds 2005R-3”). The FAME Bonds 2005R-3, which are unsecured and guaranteed jointly and severally, fully and unconditionally by all of our significant wholly-owned subsidiaries, accrue interest at 5.25% per annum until they mature on January 1, 2025.

Loss on Debt Extinguishment

We recorded a loss on debt extinguishment of $46 and $517 in the three and six months ended June 30, 2017, respectively, as compared to a loss on debt extinguishment of $593 and $545 during the three and six months ended June 30, 2016, respectively, associated with the following:


•	the write-off of debt issuance costs in connection with the amendment and repricing of our Term Loan B Facility in the three months ended June 30, 2017;


•	the write-off of debt issuance costs in connection with the remarketing of the FAME Bonds 2005R-1 and the FAME Bonds 2005R-2 into the FAME Bonds 2005R-3 in the quarter ended March 31, 2017; and


•	the write-off of debt issuance costs and unamortized original issue discount in proportion with the settlement amount, and the premium related to the redemption or repurchase price associated with the early retirement of $19,730 of our 7.75% senior subordinated notes due February 2019 in the three and six months ended June 30, 2016.

Cash Flow Hedges

In the quarter ended March 31, 2017, we entered into three interest rate derivative agreements to hedge interest rate risk associated with the variable rate portion of our long-term debt. The total notional amount of these agreements is $60,000 and requires us to receive interest based on changes in the 1-month LIBOR index with a 1.0% floor and pay interest at a weighted average rate of approximately 1.95%. Two of the agreements, with a total notional amount of $35,000, mature in February 2021, and the final agreement, with a total notional amount of $25,000, matures in February 2022. We have designated these derivative instruments as cash flow hedges.

In accordance with the derivatives and hedging guidance in FASB ASC 815 - Derivatives and Hedging, the effective portions of the changes in fair values of interest rate swaps have been recorded in equity as a component of accumulated other comprehensive loss, net of tax. As the critical terms of the interest rate swaps match the underlying debt being hedged, no ineffectiveness is recognized on these swaps and, therefore, all unrealized changes in fair value are recorded in accumulated other comprehensive loss, net of tax. Amounts are reclassified from accumulated other comprehensive loss, net of tax into earnings in the same period or periods during which the hedged transaction effects earnings.

As of June 30, 2017, we have recorded a derivative asset with a fair value of $95 in other non-current assets and a derivative liability with a fair value of $373 in other accrued liabilities associated with these cash flow hedges.

COMMITMENTS AND CONTINGENCIES

6 Months Ended

Jun. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

Legal Proceedings

In the ordinary course of our business and as a result of the extensive governmental regulation of the solid waste industry, we are subject to various judicial and administrative proceedings involving state and local agencies. In these proceedings, an agency may seek to impose fines or to revoke or deny renewal of an operating permit held by us. From time to time, we may also be subject to actions brought by special interest or other groups, adjacent landowners or residents in connection with the permitting and licensing of landfills and transfer stations, or allegations of environmental damage or violations of the permits and licenses pursuant to which we operate. In addition, we may be named defendants in various claims and suits pending for alleged damages to persons and property, alleged violations of certain laws and alleged liabilities arising out of matters occurring during the ordinary operation of a waste management business.

In accordance with FASB ASC 450 - Contingencies, we accrue for legal proceedings, inclusive of legal costs, when losses become probable and reasonably estimable. As of the end of each applicable reporting period, we review each of our legal proceedings to determine whether it is probable, reasonably possible or remote that a liability has been incurred and, if it is at least reasonably possible, whether a range of loss can be reasonably estimated under the provisions of FASB ASC 450-20. In instances where we determine that a loss is probable and we can reasonably estimate a range of loss we may incur with respect to such a matter, we record an accrual for the amount within the range that constitutes our best estimate of the possible loss. If we are able to reasonably estimate a range, but no amount within the range appears to be a better estimate than any other, we record an accrual in the amount that is the low end of such range. When a loss is reasonably possible, but not probable, we will not record an accrual, but we will disclose our estimate of the possible range of loss where such estimate can be made in accordance with FASB ASC 450-20.

Environmental Remediation Liability

We are subject to liability for environmental damage, including personal injury and property damage, that our solid waste, recycling and power generation facilities may cause to neighboring property owners, particularly as a result of the contamination of drinking water sources or soil, possibly including damage resulting from conditions that existed before we acquired the facilities. We may also be subject to liability for similar claims arising from off-site environmental contamination caused by pollutants or hazardous substances if we or our predecessors arrange or arranged to transport, treat or dispose of those materials. The following matters represent our material outstanding claims.

Southbridge Recycling & Disposal Park, Inc.

In October 2015, our Southbridge Recycling and Disposal Park, Inc. (“SRD”) subsidiary reported to the Massachusetts Department of Environmental Protection (“MADEP”) results of analysis of samples collected pursuant to our existing permit from private drinking water wells located near the Town of Southbridge, Massachusetts (“Town”) Landfill (“Southbridge Landfill”), which is operated by SRD. Those results indicated the presence of contaminants above the levels triggering notice and response obligations under MADEP regulations. In response to those results, we are carrying out an Immediate Response Action pursuant to Massachusetts General Law Chapter 21E (the "Charlton 21E Obligations") pursuant to state law. Further, we have implemented a plan to analyze and better understand the groundwater near the Southbridge Landfill and we are investigating with the objective of identifying the source or sources of the elevated levels of contamination measured in the well samples. If it is determined that some or all of the contamination originated at the Southbridge Landfill, we will work with the Town, the Southbridge Landfill owner and the former operator of an unlined portion of the Southbridge Landfill, which was used prior to our operation of a double-lined portion of the Southbridge Landfill commencing in 2004, to evaluate and allocate the liabilities related to the Charlton 21E Obligations. In July 2016, we sent correspondence to the Town pursuant to Chapter 21E of Massachusetts General Laws ("Chapter 21E") demanding that the Town reimburse us for the environmental response costs we had spent and that the Town be responsible for all such costs in the future, as well as any other costs or liabilities resulting from the release of contaminants from the unlined portion of the Southbridge Landfill. The Town responded in September 2016, denying that the Southbridge Landfill is the source of such contamination, and claiming that if it is, that we may owe an indemnity to the Town pursuant to the Operating Agreement between us and the Town dated May 29, 2007, as amended. As of June 30, 2017, we have incurred total costs of approximately $3,745. We entered into a Tolling Agreement with the Town to delay any further administrative or legal actions until our work with MADEP more specifically defines the parties’ responsibilities for the Charlton 21E Obligations, if any. Please see below for further discussion of our relationship with the Town regarding the Charlton 21E Obligations. See also Note11, Other Items and Charges for information regarding the Southbridge landfill closure charge.

In February 2016, we and the Town received a Notice of Intent to Sue under the Resource Conservation and Recovery Act ("RCRA") from a law firm purporting to represent residents proximate to the Southbridge Landfill (“Residents”), indicating its intent to file suit against us on behalf of the Residents alleging the groundwater contamination originated from the Southbridge Landfill. In February 2017, we received an additional Notice of Intent to Sue from the National Environmental Law Center under the Federal Clean Water Act ("CWA") and RCRA (collectively the “Acts”) on behalf of Environment America, Inc., d/b/a Environment Massachusetts, and Toxics Action Center, Inc., which have referred to themselves as the Citizen Groups. The Citizen Groups alleged that we had violated the Acts, and that they intended to seek appropriate relief in federal court for those alleged violations. On or about June 9, 2017, a lawsuit was filed against us, SRD and the Town in the United States District Court for the District of Massachusetts by the Citizen Groups and the Residents alleging violations of the Acts (the “Litigation”), and demanding a variety of remedies under the Acts, including fines, remediation, mitigation and costs of litigation, and remedies for violations of Massachusetts civil law related to personal and property damages, including remediation, diminution of property values, compensation for lost use and enjoyment of properties, enjoinment of further operation of the Southbridge Landfill, and costs of litigation, plus interest on any damage award, on behalf of the Residents. We believe the Litigation to be factually inaccurate, and without legal merit, and we and SRD intend to vigorously defend the Litigation. Nevertheless, we believe it is reasonably possible that a loss will occur as a result of the Litigation although an estimate of loss cannot be reasonably provided at this time due to the infancy of this matter. We also continue to believe the Town should be responsible for costs or liabilities associated with the Litigation relative to alleged contamination originating from the unlined portion of the Southbridge Landfill, although there can be no assurance that we will not be required to incur some or all of such costs and liabilities.

We entered into an Administrative Consent Order on April 26, 2017 (the “ACO”), with MADEP, the Town, and the Town of Charlton, committing us to equally share the costs with MADEP, of up to $10,000 ($5,000 each) for the Town to install a municipal waterline in the Town of Charlton ("Waterline"). Upon satisfactory completion of that Waterline, and other matters covered by the ACO, we and the Town will be released by MADEP from any future responsibilities for the Charlton Chapter 21E Obligations. We also entered into an agreement with the Town on April 28, 2017 entitled the “21E Settlement and Water System Construction Funding Agreement” (the “Waterline Agreement”), wherein we and the Town released each other from claims arising from the Charlton 21E Obligations. Pursuant to the Waterline Agreement, the Town will issue a twenty (20) year bond for our portion of the Waterline costs (up to $5,000). We have agreed to reimburse the Town for periodic payments under such bond. As of June 30, 2017, we have recorded an environmental remediation liability of $6,379 associated with the future installation of the Waterline in other accrued liabilities and other long-term liabilities. We inflated the estimated costs in current dollars to the expected time of payment and discount the total cost to present value using a risk free interest rate of 2.6%. Our expenditures could be significantly higher if costs exceed estimates. See Note11, Other Items and Charges for information regarding the Southbridge landfill closure charge.

In August 2016, we filed a complaint against Steadfast Insurance Company (“Steadfast”) in the Superior Court of Suffolk County, Massachusetts, alleging among other things, that Steadfast breached its Pollution Liability Policy (“Policy”) purchased by us in April 2015, by refusing to acknowledge coverage under the Policy, and refusing to cover any of the costs and liabilities incurred by us as described above as well as costs and liabilities that we may incur in the future. Steadfast filed an answer and counterclaim in September 2016, denying that it has any obligations to us under the Policy, and seeking a declaratory judgment of Steadfast’s obligations under the Policy. We are in the discovery phase of this litigation. Steadfast has filed a Motion to Dismiss our litigation against it, and we filed our response on July 11, 2017.

The costs and liabilities we may be required to incur in connection with the foregoing Southbridge Landfill matters could be material to our results of operations, our cash flows and our financial condition. On June 13, 2017, Town voters rejected a non-binding ballot initiative intended to provide guidance to Town officials with respect to our pursuit of other landfill development opportunities at the Southbridge Landfill. Following such rejection by the Town voters, our board of directors and senior management determined after due consideration of all facts and circumstances that it is no longer likely that further development at the existing landfill site will generate an adequate risk adjusted return at the Southbridge Landfill, and accordingly we expect to cease operations at the Southbridge Landfill when no further capacity is available, expected by no later than December 31, 2018. We have delivered correspondence to the Town to this effect on August 3, 2017, citing events of Change in Law and Force Majeure pursuant to our May 29, 2007 Extension Agreement with the Town ("Extension Agreement") and the impacts of such events on further expansion of the Southbridge Landfill. We have advised the Town that we see no economically feasible way to operate the Southbridge Landfill beyond its current permitted life. Following cessation of operations, we will proceed to conduct proper closure and other activities at the Southbridge Landfill in accordance with the Extension Agreement with the Town, and Federal, state and local law. We reached this conclusion after carefully evaluating the estimated future costs associated with the permitting, engineering and construction activities for the planned expansion of the Southbridge Landfill against the possible outcomes of the permitting process and the anticipated future benefits of successful expansions. Under the Extension Agreement, which we account for as an operating lease, there are potential contractual obligations and commitments, including future cash payments of $3,069 and services that extend beyond the current useful life of the Southbridge Landfill. In accordance with ASC 420 - Exit or Disposal Cost Obligations, a liability for costs to be incurred under a contract for its remaining term without economic benefit shall be recognized when we cease using the right conveyed by the contract. We may incur a loss associated with these potential contractual obligations upon ceasation of operations at the Southbridge Landfill, when remaining capacity is exhausted by the placement of waste at the site.

Potsdam Environmental Remediation Liability

On December 20, 2000, the State of New York Department of Environmental Conservation (“DEC”) issued an Order on Consent (“Order”) which named Waste-Stream, Inc. (“WSI”), our subsidiary, General Motors Corporation (“GM”) and Niagara Mohawk Power Corporation (“NiMo”) as Respondents. The Order required that the Respondents undertake certain work on a 25-acre scrap yard and solid waste transfer station owned by WSI in Potsdam, New York, including the preparation of a Remedial Investigation and Feasibility Study (“Study”). A draft of the Study was submitted to the DEC in January 2009 (followed by a final report in May 2009). The Study estimated that the undiscounted costs associated with implementing the preferred remedies would be approximately $10,219. On February 28, 2011, the DEC issued a Proposed Remedial Action Plan for the site and accepted public comments on the proposed remedy through March 29, 2011. We submitted comments to the DEC on this matter. In April 2011, the DEC issued the final Record of Decision (“ROD”) for the site. The ROD was subsequently rescinded by the DEC for failure to respond to all submitted comments. The preliminary ROD, however, estimated that the present cost associated with implementing the preferred remedies would be approximately $12,130. The DEC issued the final ROD in June 2011 with proposed remedies consistent with its earlier ROD. An Order on Consent and Administrative Settlement naming WSI and NiMo as Respondents was executed by the Respondents and DEC with an effective date of October 25, 2013. On January 29, 2016, a Cost-Sharing Agreement was executed between WSI, NiMo, Alcoa Inc. (“Alcoa”) and Reynolds Metal Company (“Reynolds”) whereby Alcoa and Reynolds elected to voluntarily participate in the onsite remediation activities at a 15% participant share. It is unlikely that any significant expenditures relating to onsite remediation will be incurred until the fiscal year ending December 31, 2018. WSI is jointly and severally liable with NiMo, Alcoa and Reynolds for the total cost to remediate.

We have recorded an environmental remediation liability associated with the Potsdam site based on incurred costs to date and estimated costs to complete the remediation in other accrued liabilities and other long-term liabilities. Our expenditures could be significantly higher if costs exceed estimates. We inflate the estimated costs in current dollars to the expected time of payment and discount the total cost to present value using a risk free interest rate of 1.5%. The changes to the environmental remediation liability associated with the Potsdam site are as follows:




	Six Months Ended June 30,
	2017			2016
Beginning balance	$	5,866		$	5,221
Obligations settled (1)	(5		)	—
Ending balance	$	5,861		$	5,221


(1)	Includes amounts that are being processed through accounts payable as a part of our disbursement cycle.

STOCKHOLDERS' EQUITY

6 Months Ended

Jun. 30, 2017

Equity [Abstract]

STOCKHOLDERS' EQUITY

Stock Based Compensation

Shares Available For Issuance

In the fiscal year ended December 31, 2016, we adopted the 2016 Incentive Plan (“2016 Plan”). Under the 2016 Plan, we may grant awards up to an aggregate amount of shares equal to the sum of: (i) 2,250 shares of Class A common stock (subject to adjustment in the event of stock splits and other similar events), plus (ii) such additional number of shares of Class A common stock (up to 2,723 shares) as is equal to the sum of the number of shares of Class A common stock that remained available for grant under the 2006 Stock Incentive Plan (“2006 Plan”) immediately prior to the expiration of the 2006 Plan and the number of shares of Class A common stock subject to awards granted under the 2006 Plan that expire, terminate or are otherwise surrendered, canceled, forfeited or repurchased by us. As of June 30, 2017, there were 1,897 Class A common stock equivalents available for future grant under the 2016 Plan.

Stock Options

Stock options are granted at a price equal to the prevailing fair value of our Class A common stock at the date of grant. Generally, stock options granted have a term not to exceed ten years and vest over a one year to four year period from the date of grant.

The fair value of each stock option granted, with the exception of market-based performance stock option grants, is estimated using a Black-Scholes option-pricing model, which requires extensive use of accounting judgment and financial estimation, including estimates of the expected term stock option holders will retain their vested stock options before exercising them and the estimated volatility of our Class A common stock price over the expected term. The fair value of each market-based performance stock option granted is estimated using a Monte Carlo option-pricing model, which also requires extensive use of accounting judgment and financial estimation, including estimates of the expected term stock option holders will retain their vested stock options before exercising them and the estimated volatility of our Class A common stock price over the expected term, but also including estimates of share price appreciation plus the value of dividends of our Class A common stock as compared to the Russell 2000 Index over the requisite service period.

A summary of stock option activity follows:



	Stock Options (1)		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Outstanding, December 31, 2016	1,115		$	6.13
Granted	—		$	—
Exercised	(78	)	$	11.01
Forfeited	(2	)	$	4.06
Outstanding, June 30, 2017	1,035		$	5.76	5.7	$	11,020
Exercisable, June 30, 2017	702		$	5.15	4.6	$	7,897
Unvested, June 30, 2017	373		$	7.62	8.2	$	3,280


(1)	Market-based performance stock options are included at the 100% attainment level. Attainment of the maximum performance targets and market achievements would result in the issuance of an additional 40 shares of Class A common stock currently included in unvested.

Stock-based compensation expense for stock options was $176 and $347 during the three and six months ended June 30, 2017, respectively, as compared to $146 and $292 during the three and six months ended June 30, 2016, respectively.

During the three and six months ended June 30, 2017, the aggregate intrinsic value of stock options exercised was $153 and $206, respectively.

As of June 30, 2017, total unrecognized stock-based compensation expense related to outstanding stock options, including market-based performance stock options assuming the attainment of maximum performance targets, was $771, which will be recognized over a weighted average period of 0.8 years.

Other Stock Awards

Restricted stock awards, restricted stock units and performance stock units, with the exception of market-based performance stock units, are granted at a price equal to the fair value of our Class A common stock at the date of grant. The fair value of each market-based performance stock unit is estimated using a Monte Carlo pricing model, which requires extensive use of accounting judgment and financial estimation, including the estimated share price appreciation plus the value of dividends of our Class A common stock as compared to the Russell 2000 Index over the requisite service period.

Restricted stock awards granted to non-employee directors vest incrementally over a three year period beginning on the first anniversary of the date of grant. Restricted stock units granted to non-employee directors vest in full on the first anniversary of the grant date. Restricted stock units granted to employees vest incrementally over an identified service period beginning on the grant date based on continued employment. Performance stock units granted to employees, including market-based performance stock units, vest at a future date following the grant date and are based on the attainment of performance targets and market achievements, as applicable.

A summary of restricted stock, restricted stock unit and performance stock unit activity follows:



	Restricted Stock, Restricted Stock Units, and Performance Stock Units (1)		Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Outstanding, December 31, 2016	1,099		$	7.03
Granted	438		$	12.32
Class A Common Stock Vested	(370	)	$	5.07
Forfeited	(18	)	$	5.99
Outstanding, June 30, 2017	1,149		$	9.63	1.8	$	7,784
Unvested, June 30, 2017	1,512		$	10.32	1.9	$	9,190


(1)	Market-based performance stock unit grants are included at the 100% attainment level. Attainment of the maximum performance targets and market achievements would result in the issuance of an additional 363 shares of Class A common stock currently included in unvested.

Stock-based compensation expense related to restricted stock, restricted stock units and performance stock units was $1,441 and $2,499 during the three and six months ended June 30, 2017, respectively, as compared to $729 and $1,278 during the three and six months ended June 30, 2016, respectively.

During the three and six months ended June 30, 2017, the total fair value of other stock awards vested was $1,362 and $4,770, respectively.

As of June 30, 2017, total unrecognized stock-based compensation expense related to outstanding restricted stock and restricted stock units was $4,437, which will be recognized over a weighted average period of 1.6 years. As of June 30, 2017, maximum unrecognized stock-based compensation expense related to outstanding performance stock units, assuming the attainment of maximum performance targets, was $6,980 to be recognized over a weighted average period of 2.0 years.

The weighted average fair value of market-based performance stock units granted during the six months ended June 30, 2017 was $12.51 per award, which was calculated using a Monte Carlo pricing model assuming a risk free interest rate of 1.45% and an expected volatility of 32.80% assuming no expected dividend yield. The risk-free interest rate is based on the U.S. Treasury yield curve for the expected service period of the award. Expected volatility is calculated using the daily volatility of our Class A common stock over the expected service period of the award.

The Monte Carlo pricing model requires extensive use of accounting judgment and financial estimation. Application of alternative assumptions could produce significantly different estimates of the fair value of stock-based compensation and consequently, the related amounts recognized in the consolidated statements of operations.

We also recorded $37 and $65 of stock-based compensation expense related to our Amended and Restated 1997 Employee Stock Purchase Plan during the three and six months ended June 30, 2017, respectively, as compared to $26 and $52 during the three and six months ended June 30, 2016, respectively.

Accumulated Other Comprehensive Loss

A summary of the changes in the balances of each component of accumulated other comprehensive loss, net of tax follows:




	Marketable Securities			Interest Rate Swaps
Balance, December 31, 2016	$	(68	)	$	—
Other comprehensive income (loss) before reclassifications	46			(472		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			208
Net current-period other comprehensive income (loss)	46			(264		)
Balance, June 30, 2017	$	(22	)	$	(264	)

A summary of reclassifications out of accumulated other comprehensive loss, net of tax follows:



	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
Details About Accumulated Other Comprehensive Loss Components	Amounts Reclassified Out of Accumulated Other Comprehensive Loss								Affected Line Item in the Consolidated Statements of Operations
Interest rate swaps	$	138	$	—	$	208	$	—	Interest expense
	138		—		208		—		(Loss) income before income taxes
	—		—		—		—		Provision for income taxes
	$	138	$	—	$	208	$	—	Net (loss) income

EARNINGS PER SHARE

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

EARNINGS PER SHARE

Basic earnings per share is computed by dividing the net (loss) income from continuing operations attributable to common stockholders by the weighted average number of common shares outstanding during the period. Diluted earnings per share is calculated based on the combined weighted average number of common shares and potentially dilutive shares, which include the assumed exercise of employee stock options, including market-based performance stock options based on the expected achievement of performance targets, unvested restricted stock awards, unvested restricted stock units and unvested performance stock units, including market-based performance units based on the expected achievement of performance targets. In computing diluted earnings per share, we utilize the treasury stock method.

A summary of the numerator and denominators used in the computation of earnings per share follows:



	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
Numerator:
Net (loss) income attributable to common stockholders	$	(53,675	)	$	5,195		$	(53,900	)	$	(2,413	)
Denominators:
Number of shares outstanding, end of period:
Class A common stock	41,042			40,500			41,042			40,500
Class B common stock	988			988			988			988
Unvested restricted stock	(88		)	(115		)	(88		)	(115		)
Effect of weighted average shares outstanding	(131		)	(241		)	(244		)	(309		)
Basic weighted average common shares outstanding	41,811			41,132			41,698			41,064
Impact of potentially dilutive securities:
Dilutive effect of stock options and other stock awards	—			466			—			—
Diluted weighted average common shares outstanding	41,811			41,598			41,698			41,064
Anti-dilutive potentially issuable shares	2,586			473			2,586			2,211

OTHER ITEMS AND CHARGES

6 Months Ended

Jun. 30, 2017

Environmental Remediation Obligations [Abstract]

Other Items and Charges

Southbridge Landfill Closure Charge

In June 2017, we initiated the plan to cease operations of our Southbridge landfill as disclosed in Note 8, Commitments and Contingencies. Accordingly, in the three months ended June 30, 2017, we recorded a charge associated with the closure of our Southbridge landfill as follows:



	Three Months Ended June 30,					Six Months Ended June 30,
	2017		2016			2017		2016
Asset impairment charge (1)	$	47,999	$	—		$	47,999	$	—
Project development charge (2)	9,148		—			9,148		—
Environmental remediation charge (3)	6,379		—			6,379		—
Legal and transaction costs (4)	588		—			588		—
Southbridge landfill closure charge	$	64,114	$	—	—	$	64,114	$	—

(1)

We performed a test of recoverability under FASB ASC 360 - Property, Plant, and Equipment, which indicated that the carrying value of our asset group that includes the Southbridge landfill was no longer recoverable and, as a result, the asset group was assessed for impairment with an impairment charge allocated to the long-lived assets of Southbridge landfill in accordance with FASB ASC 360 - Property, Plant, and Equipment. See Note 12, Fair Value of Financial Instruments for additional disclosure.


(2)	We wrote-off deferred costs associated with landfill permitting activities no longer deemed viable.


(3)	We recorded an environmental remediation charge associated with the future installation of a municipal waterline. See Note 8, Commitments and Contingencies for additional disclosure.


(4)	We incurred legal and other transaction costs associated with various matters as part of the Southbridge landfill closure. See Note 8, Commitments and Contingencies for additional disclosure.

FAIR VALUE OF FINANCIAL INSTRUMENTS

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

FAIR VALUE OF FINANCIAL INSTRUMENTS

We use a three-tier fair value hierarchy to classify and disclose all assets and liabilities measured at fair value on a recurring basis, as well as assets and liabilities measured at fair value on a non-recurring basis, in periods subsequent to their initial measurement. These tiers include: Level 1, defined as quoted market prices in active markets for identical assets or liabilities; Level 2, defined as inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; and Level 3, defined as unobservable inputs that are not corroborated by market data.

We use valuation techniques that maximize the use of market prices and observable inputs and minimize the use of unobservable inputs. In measuring the fair value of our financial assets and liabilities, we rely on market data or assumptions that we believe market participants would use in pricing an asset or a liability.

Assets and Liabilities Accounted for at Fair Value

Our financial instruments include cash and cash equivalents, accounts receivable-trade, restricted cash and investments held in trust on deposit with various banks as collateral for our obligations relative to our landfill final capping, closure and post-closure costs, interest rate derivatives, trade payables and long-term debt. The carrying values of cash and cash equivalents, accounts receivable - trade and trade payables approximate their respective fair values due to their short-term nature. The fair value of restricted cash and investments held in trust, which are valued using quoted market prices, are included as restricted assets in the Level 1 tier below. The fair value of the interest rate derivatives included in the Level 2 tier below was calculated using discounted cash flow valuation methodologies based upon the one month LIBOR yield curves that are observable at commonly quoted intervals for the full term of the swaps.

Recurring Fair Value Measurements

Summaries of our financial assets and liabilities that are measured at fair value on a recurring basis follow:



	Fair Value Measurement at June 30, 2017 Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Interest rate derivatives	$	—	$	95	$	—
Restricted investments - landfill closure	1,065		—		—
Total	$	1,065	$	95	$	—
Liabilities:
Interest rate derivatives	$	—	$	373	$	—



	Fair Value Measurement at December 31, 2016 Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Restricted investments - landfill closure	$	1,002	$	—	$	—

Non-Recurring Fair Value Measurements

A summary of our financial assets and liabilities that are measured at fair value on a non-recurring basis follows:



	Fair Value Measurement at June 30, 2017 Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Southbridge landfill asset group - long-lived assets	$	—	$	—	$	8,017

As of June 30, 2017, our financial assets and liabilities recorded at fair value on a non-recurring basis include our asset group that includes the Southbridge landfill. The fair value of our asset group that includes the Southbridge landfill was measured by a third-party valuation specialist who completed a valuation analysis using an income approach based on discounted cash flows. See Note 8, Commitments and Contingencies and Note 11, Other Items and Charges for additional disclosure regarding the Southbridge landfill.

Fair Value of Debt

As of June 30, 2017, the fair value of our fixed rate debt, including our FAME Bonds 2005R-3, Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015 (“FAME Bonds 2015”), Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 (“Vermont Bonds”), New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 (“New York Bonds 2014”), New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2 (“New York Bonds 2016”) and Solid Waste Disposal Revenue Bonds Series 2013 issued by the Business Finance Authority of the State of New Hampshire (“New Hampshire Bonds”) was approximately $106,183 and the carrying value was $107,000. The fair value of the FAME Bonds 2005R-3, the FAME Bonds 2015, the Vermont Bonds, the New York Bonds 2014, the New York Bonds 2016 and the New Hampshire Bonds is considered to be Level 2 within the fair value hierarchy as the fair value is determined using market approach pricing provided by a third-party that utilizes pricing models and pricing systems, mathematical tools and judgment to determine the evaluated price for the security based on the market information of each of the bonds or securities with similar characteristics.

As of June 30, 2017, the fair value of our Term Loan B Facility was approximately $349,556 and the carrying value was $348,250. The fair value of the Term Loan B Facility is considered to be Level 2 within the fair value hierarchy as its fair value is based off of quoted market prices in a principal to principal market with limited public information. As of June 30, 2017, the fair value of our Revolving Credit Facility approximated its carrying value of $55,600 based on current borrowing rates for similar types of borrowing arrangements, or Level 2 inputs.

Although we have determined the estimated fair value amounts of the Term Loan B Facility, FAME Bonds 2005R-3, FAME Bonds 2015, Vermont Bonds, New York Bonds 2014, New York Bonds 2016 and New Hampshire Bonds using available market information and commonly accepted valuation methodologies, a change in available market information, and/or the use of different assumptions and/or estimation methodologies could have a material effect on the estimated fair values. These amounts have not been revalued, and current estimates of fair value could differ significantly from the amounts presented.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

SEGMENT REPORTING

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

SEGMENT REPORTING

We report selected information about operating segments in a manner consistent with that used for internal management reporting. We classify our solid waste operations on a geographic basis through regional operating segments, our Western and Eastern regions. Revenues associated with our solid waste operations are derived mainly from solid waste collection and disposal, landfill, landfill gas-to-energy, transfer and recycling services in the northeastern United States. Our revenues in the Recycling segment are derived from municipalities and customers in the form of processing fees, tipping fees and commodity sales. Organics services, ancillary operations, major account and industrial services, discontinued operations, and earnings from equity method investees, as applicable, are included in our Other segment.

Three Months Ended June 30, 2017



Segment	Outside revenues		Inter-company revenue			Depreciation and amortization		Operating income (loss)			Total assets
Eastern	$	46,574	$	13,202		$	6,423	$	(60,324	)	$	158,042
Western	64,372		18,625			7,586		10,770			328,207
Recycling	16,211		(245		)	1,019		1,064			50,398
Other	26,859		611			840		1,211			52,230
Eliminations	—		(32,193		)	—		—			—
Total	$	154,016	$	—		$	15,868	$	(47,279	)	$	588,877

Three Months Ended June 30, 2016



Segment	Outside revenues		Inter-company revenue			Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	45,405	$	11,692		$	7,138	$	3,079	$	208,316
Western	59,460		17,889			6,908		10,175		319,480
Recycling	12,816		302			1,040		468		48,782
Other	26,989		404			716		1,874		55,043
Eliminations	—		(30,287		)	—		—		—
Total	$	144,670	$	—		$	15,802	$	15,596	$	631,621

Six Months Ended June 30, 2017




Segment	Outside revenues		Inter-company revenue			Depreciation and amortization		Operating income (loss)			Total assets
Eastern	$	85,260	$	22,724		$	11,827	$	(60,304	)	$	158,042
Western	118,515		34,407			14,191		14,859			328,207
Recycling	32,846		(489		)	2,022		2,647			50,398
Other	51,197		985			1,677		2,084			52,230
Eliminations	—		(57,627		)	—		—			—
Total	$	287,818	$	—		$	29,717	$	(40,714	)	$	588,877

Six Months Ended June 30, 2016




Segment	Outside revenues		Inter-company revenue			Depreciation and amortization		Operating income (loss)			Total assets
Eastern	$	84,392	$	21,229		$	13,327	$	2,291		$	208,316
Western	111,922		32,740			13,398		13,169			319,480
Recycling	23,454		933			2,132		(606		)	48,782
Other	50,335		684			1,398		2,716			55,043
Eliminations	—		(55,586		)	—		—			—
Total	$	270,103	$	—		$	30,255	$	17,570		$	631,621

A summary of our revenues attributable to services provided follows:



	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
Collection	$	66,308	$	63,685	$	126,145	$	121,536
Disposal	42,172		39,384		73,454		71,637
Power generation	1,554		1,460		2,906		3,167
Processing	2,137		1,747		3,796		2,720
Solid waste operations	112,171		106,276		206,301		199,060
Organics	11,005		12,171		20,219		21,106
Customer solutions	14,629		13,407		28,452		26,483
Recycling	16,211		12,816		32,846		23,454
Total revenues	$	154,016	$	144,670	$	287,818	$	270,103

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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+ Details

ACCOUNTING CHANGES (Policies)

6 Months Ended

Jun. 30, 2017

Accounting Changes and Error Corrections [Abstract]

Basis of Presentation

Casella Waste Systems, Inc. (“Parent”), and its consolidated subsidiaries (collectively, “we”, “us” or “our”), is a regional, vertically integrated solid waste services company that provides collection, transfer, disposal, landfill, landfill gas-to-energy, recycling and organics services in the northeastern United States. We market recyclable metals, aluminum, plastics, paper and corrugated cardboard, which have been processed at our recycling facilities, as well as recyclables purchased from third-parties. We manage our solid waste operations on a geographic basis through two regional operating segments, the Eastern and Western regions, each of which provides a full range of solid waste services, and our larger-scale recycling and commodity brokerage operations through our Recycling segment. Organics services, ancillary operations, major account and industrial services, discontinued operations and earnings from equity method investees, as applicable, are included in our Other segment.

The accompanying unaudited consolidated financial statements, which include the accounts of the Parent, our wholly-owned subsidiaries and any partially owned entities over which we have a controlling financial interest, have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). All significant intercompany accounts and transactions are eliminated in consolidation. Investments in entities in which we do not have a controlling financial interest are accounted for under either the equity method or the cost method of accounting, as appropriate. Our significant accounting policies are more fully discussed in Item 8 of our Annual Report on Form 10-K for the fiscal year ended December 31, 2016, which was filed with the SEC on March 2, 2017.

Use of Estimates

Preparation of our consolidated financial statements in accordance with GAAP requires management to make certain estimates and assumptions. These estimates and assumptions affect the accounting for and recognition and disclosure of assets, liabilities, equity, revenues and expenses. We must make these estimates and assumptions because certain information that we use is dependent on future events, cannot be calculated with a high degree of precision given the available data, or simply cannot be readily calculated. In the opinion of management, these consolidated financial statements include all adjustments, which include normal recurring and nonrecurring adjustments, necessary for a fair presentation of the financial position, results of operations and cash flows for the periods presented. The results for the three and six months ended June 30, 2017 may not be indicative of the results for any other interim period or the entire fiscal year. The consolidated financial statements presented herein should be read in conjunction with our audited consolidated financial statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2016.

Subsequent Events

We have evaluated subsequent events or transactions that have occurred after the consolidated balance sheet date of June 30, 2017 through the date of filing of the consolidated financial statements with the SEC on this Quarterly Report on Form 10-Q. We have determined that there are no subsequent events that require disclosure in this Quarterly Report on Form 10-Q.

Accounting Standards that are Pending Adoption



Standard	Description	Effect on the Financial Statements or Other Significant Matters
Accounting standards that are pending adoption
ASU 2017-09: Compensation - Stock Compensation (Topic 718)	Requires that an entity should account for the effects of a modification to an award unless all of the following conditions are met: the fair value of the modified award is the same as the fair value of the original award immediately before the original award is modified; the vesting conditions of the modified award are the same as the vesting conditions immediately before the original award is modified; and the classification of modified award as an equity instrument or a liability instrument is the same as the classification of the original award immediately before the original award is modified.	The adoption of this guidance could effect equity compensation expense and net income if there is a modification of an award. This guidance is effective January 1, 2018 with early adoption permitted.

ASU 2017-04: Intangibles - Goodwill and Other (Topic 350)	Requires that when an entity is performing its annual, or interim, goodwill impairment test, it should compare the fair value of the reporting unit with its carrying amount when calculating its impairment charge, noting that the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. Additionally, if applicable, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when calculating its impairment charge.	As of December 31, 2016, we did not record a goodwill impairment charge related to our annual goodwill impairment test because at that time the fair value of each reporting unit exceeded its respective carrying value. If the carrying value of any of these reporting units exceeds the fair value when we perform a goodwill impairment test, we would record an impairment charge equal to the amount by which the carrying value exceeds its fair value. This guidance is effective January 1, 2020 with early adoption permitted for interim or annual goodwill impairment tests performed after January 1, 2017.

ASU 2016-02: Leases (Topic 842)	Requires that a lessee recognize at the commencement date: a lease liability, which is the obligation of the lessee to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term.	We are currently assessing the provisions of this guidance and evaluating the timing and impact the guidance will have on our consolidated financial statements and related disclosures. We are also in the process of aggregating operating lease documentation for review. The adoption of this ASU primarily impacts the balance sheet through the recognition of a right-of-use asset and a lease liability for all leases with terms in excess of 12 months and currently classified as operating leases. This guidance is effective January 1, 2019 using a modified retrospective transition approach with early adoption permitted.

ASU 2016-01: Financial Instruments - Overall (Topic 825-10)	Requires the following: (1) equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income; (2) entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; (3) separate presentation of financial assets and financial liabilities by measurement category and form of financial asset; and (4) the elimination of the disclosure requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost.	The adoption of this guidance results in a cumulative-effect adjustment to the balance sheet, the recognition of changes in fair value of certain equity investments in net income, and enhanced disclosure. This guidance is effective January 1, 2018 with a cumulative-effect adjustment.

ASU 2014-09, as amended through May 2017: Revenue from Contracts with Customers (Topic 606)	The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.	We are currently evaluating the alternative methods of adoption and the effect of this guidance on our consolidated financial statements and related disclosures. To assess the impact of this standard, internal resources have reviewed the amended guidance and attended training to assist with the interpretation and implementation of the amended guidance. We have also consulted with outside resources to assist in applying and implementing this guidance. We are currently in the process of identifying, reviewing and documenting material contracts and revenue streams that are impacted by this guidance. This guidance is effective January 1, 2018 using a full or modified retrospective approach with early adoption permitted January 1, 2017.

Accrued Final Capping, Closure and Post Closure

Legal Proceedings

Fair Value of Financial Instruments

Assets and Liabilities Accounted for at Fair Value

Segment Reporting

ACCOUNTING CHANGES (Tables)

6 Months Ended

Jun. 30, 2017

Accounting Changes and Error Corrections [Abstract]

Description of Recent Accounting Standards Updates ("ASU") Not Yet Adopted



Standard	Description	Effect on the Financial Statements or Other Significant Matters
Accounting standards that are pending adoption
ASU 2017-09: Compensation - Stock Compensation (Topic 718)	Requires that an entity should account for the effects of a modification to an award unless all of the following conditions are met: the fair value of the modified award is the same as the fair value of the original award immediately before the original award is modified; the vesting conditions of the modified award are the same as the vesting conditions immediately before the original award is modified; and the classification of modified award as an equity instrument or a liability instrument is the same as the classification of the original award immediately before the original award is modified.	The adoption of this guidance could effect equity compensation expense and net income if there is a modification of an award. This guidance is effective January 1, 2018 with early adoption permitted.

ASU 2017-04: Intangibles - Goodwill and Other (Topic 350)	Requires that when an entity is performing its annual, or interim, goodwill impairment test, it should compare the fair value of the reporting unit with its carrying amount when calculating its impairment charge, noting that the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. Additionally, if applicable, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when calculating its impairment charge.	As of December 31, 2016, we did not record a goodwill impairment charge related to our annual goodwill impairment test because at that time the fair value of each reporting unit exceeded its respective carrying value. If the carrying value of any of these reporting units exceeds the fair value when we perform a goodwill impairment test, we would record an impairment charge equal to the amount by which the carrying value exceeds its fair value. This guidance is effective January 1, 2020 with early adoption permitted for interim or annual goodwill impairment tests performed after January 1, 2017.

ASU 2016-02: Leases (Topic 842)	Requires that a lessee recognize at the commencement date: a lease liability, which is the obligation of the lessee to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term.	We are currently assessing the provisions of this guidance and evaluating the timing and impact the guidance will have on our consolidated financial statements and related disclosures. We are also in the process of aggregating operating lease documentation for review. The adoption of this ASU primarily impacts the balance sheet through the recognition of a right-of-use asset and a lease liability for all leases with terms in excess of 12 months and currently classified as operating leases. This guidance is effective January 1, 2019 using a modified retrospective transition approach with early adoption permitted.

ASU 2016-01: Financial Instruments - Overall (Topic 825-10)	Requires the following: (1) equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income; (2) entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; (3) separate presentation of financial assets and financial liabilities by measurement category and form of financial asset; and (4) the elimination of the disclosure requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost.	The adoption of this guidance results in a cumulative-effect adjustment to the balance sheet, the recognition of changes in fair value of certain equity investments in net income, and enhanced disclosure. This guidance is effective January 1, 2018 with a cumulative-effect adjustment.

ASU 2014-09, as amended through May 2017: Revenue from Contracts with Customers (Topic 606)	The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.	We are currently evaluating the alternative methods of adoption and the effect of this guidance on our consolidated financial statements and related disclosures. To assess the impact of this standard, internal resources have reviewed the amended guidance and attended training to assist with the interpretation and implementation of the amended guidance. We have also consulted with outside resources to assist in applying and implementing this guidance. We are currently in the process of identifying, reviewing and documenting material contracts and revenue streams that are impacted by this guidance. This guidance is effective January 1, 2018 using a full or modified retrospective approach with early adoption permitted January 1, 2017.

BUSINESS COMBINATIONS (Tables)

6 Months Ended

Jun. 30, 2017

Business Combinations [Abstract]

Summary of Purchase Price Paid for Acquisitions

A summary of the purchase price for these acquisitions and the allocation of the purchase price for these acquisitions follows:



	Six Months Ended June 30,
	2017			2016
Purchase Price:
Cash paid for acquisitions	$	2,664		$	2,439
Notes payable	2,400			—
Other non-cash considerations	100			—
Holdbacks	196			400
Total	5,360			2,839
Allocated as follows:
Current assets	—			40
Land	—			353
Building	—			1,360
Equipment	2,291			269
Intangible assets	1,317			—
Other liabilities, net	(49		)	(106		)
Fair value of assets acquired and liabilities assumed	3,559			1,916
Excess purchase price allocated to goodwill	$	1,801		$	923

Schedule of Unaudited Pro forma Combined Information



	Three Months Ended June 30,					Six Months Ended June 30,
	2017			2016		2017			2016
Revenue	$	154,729		$	145,911	$	289,715		$	273,408
Operating (loss) income	$	(47,273	)	$	15,625	$	(40,685	)	$	17,548
Net (loss) income attributable to common stockholders	$	(53,673	)	$	5,208	$	(53,889	)	$	(2,435	)
Basic weighted average common shares outstanding	41,811			41,132		41,698			41,064
Basic earnings per share attributable to common stockholders	$	(1.28	)	$	0.13	$	(1.29	)	$	(0.06	)
Diluted weighted average shares outstanding	41,811			41,598		41,698			41,064
Diluted earnings per share attributable to common stockholders	$	(1.28	)	$	0.13	$	(1.29	)	$	(0.06	)

GOODWILL AND INTANGIBLE ASSETS (Tables)

6 Months Ended

Jun. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Activity and Balances Related to Goodwill by Operating Segment

A summary of the activity and balances related to goodwill by operating segment follows:



	December 31, 2016		Acquisitions		June 30, 2017
Eastern region	$	17,429	$	1,764	$	19,193
Western region	88,426		37		88,463
Recycling	12,315		—		12,315
Other	1,729		—		1,729
Total	$	119,899	$	1,801	$	121,700

Summary of Intangible Assets by Intangible Asset Type

A summary of intangible assets by intangible asset type follows:



	Covenants Not-to-Compete			Client Lists			Total
Balance, June 30, 2017
Intangible assets	$	17,941		$	17,189		$	35,130
Less accumulated amortization	(16,627		)	(10,334		)	(26,961		)
	$	1,314		$	6,855		$	8,169



	Covenants Not-to-Compete			Client Lists			Total
Balance, December 31, 2016
Intangible assets	$	17,594		$	16,071		$	33,665
Less accumulated amortization	(16,402		)	(9,567		)	(25,969		)
	$	1,192		$	6,504		$	7,696

Summary of Intangible Amortization Expense Estimated

A summary of intangible amortization expense estimated for the five fiscal years following the fiscal year ended December 31, 2016 and thereafter follows:



Estimated Future Amortization Expense as of June 30, 2017
Fiscal year ending December 31, 2017	$	1,048
Fiscal year ending December 31, 2018	$	1,925
Fiscal year ending December 31, 2019	$	1,563
Fiscal year ending December 31, 2020	$	1,359
Fiscal year ending December 31, 2021	$	1,094
Thereafter	$	1,180

ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE (Tables)

6 Months Ended

Jun. 30, 2017

Asset Retirement Obligation Disclosure [Abstract]

Summary of Changes to Accrued Capping, Closure and Post-Closure Liabilities

A summary of the changes to accrued final capping, closure and post-closure liabilities follows:



	Six Months Ended June 30,
	2017			2016
Beginning balance	$	44,207		$	41,041
Obligations incurred	1,310			1,143
Revisions in estimates (1)	9,598			(56		)
Accretion expense	1,939			1,782
Obligations settled (2)	(307		)	(432		)
Ending balance	$	56,747		$	43,478


(1)	Relates to changes in estimates and assumptions concerning anticipated waste flow, cost and timing of future final capping, closure and post-closure activities at our Southbridge landfill associated with the Southbridge landfill closure. See Note 8, Commitments and Contingencies and Note 11, Other Items and Charges for disclosure regarding the matter.


(2)	Includes amounts that are being processed through accounts payable as a part of our disbursement cycle.

OTHER ACCRUED LIABILITIES (Tables)

6 Months Ended

Jun. 30, 2017

Other Liabilities Disclosure [Abstract]

Other Accrued Liabilities

A summary of other accrued liabilities, classified as current liabilities, follows:



	June 30, 2017		December 31, 2016
Self insurance reserve - current portion	$	4,229	$	3,836
Other accrued liabilities	16,368		11,080
Total other accrued liabilities	$	20,597	$	14,916

LONG-TERM DEBT (Tables)

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

Summary of Components of Long-Term Debt and Capital Leases by Debt Instrument

A summary of long-term debt and capital leases by debt instrument follows:



	June 30, 2017		December 31, 2016
Senior Secured Credit Facility:
Revolving Credit Facility due October 2021; bearing interest at LIBOR plus 2.75% and 3.00%, respectively	$	55,600	$	62,600
Term Loan B Facility due October 2023; bearing interest at LIBOR plus 2.75% and 3.00%, respectively	348,250		350,000
Tax-Exempt Bonds:
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 due December 2044 - fixed rate interest period through 2019; bearing interest at 3.75%	25,000		25,000
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2 due December 2044 - fixed rate interest period through 2026; bearing interest at 3.125%	15,000		15,000
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3 due January 2025 - fixed rate interest period through 2025; bearing interest at 5.25%	25,000		—
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015 due August 2035 - fixed rate interest period through 2025; bearing interest at 5.125%	15,000		15,000
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 due April 2036 - fixed rate interest period through 2018; bearing interest at 4.75%	16,000		16,000
Business Finance Authority of the State of New Hampshire Solid Waste Disposal Revenue Bonds Series 2013 due April 2029 - fixed rate interest period through 2019; bearing interest at 4.00%	11,000		11,000
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-2 due January 2025 - fixed rate interest period through 2017; bore interest at 6.25%	—		21,400
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-1; letter of credit backed due January 2025 - bore interest at SIFMA Index	—		3,600
Other:
Capital leases maturing through April 2023; bearing interest at up to 7.70%	5,363		5,534
Notes payable maturing through June 2027; bearing interest at up to 7.00%	2,945		449
Principal amount of long-term debt and capital leases	519,158		525,583
Less—unamortized discount and debt issuance costs (1)	16,550		16,936
Long-term debt and capital leases less unamortized discount and debt issuance costs	502,608		508,647
Less—current maturities of long-term debt	5,016		4,686
	$	497,592	$	503,961


(1)	A summary of unamortized discount and debt issuance costs by debt instrument follows:



	June 30, 2017		December 31, 2016
Revolving Credit Facility	$	4,452	$	4,965
Term Loan B Facility (including unamortized discount of $1,598 and $1,712)	7,970		7,718
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014	1,128		1,221
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2	541		571
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3	645		—
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015	726		760
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013	589		605
Business Finance Authority of the State of New Hampshire Solid Waste Disposal Revenue Bonds Series 2013	499		563
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-1	—		31
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-2	—		502
	$	16,550	$	16,936

COMMITMENTS AND CONTINGENCIES (Tables)

6 Months Ended

Jun. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Summary of Environmental Liability Associated with Potsdam

The changes to the environmental remediation liability associated with the Potsdam site are as follows:




	Six Months Ended June 30,
	2017			2016
Beginning balance	$	5,866		$	5,221
Obligations settled (1)	(5		)	—
Ending balance	$	5,861		$	5,221


(1)	Includes amounts that are being processed through accounts payable as a part of our disbursement cycle.

STOCKHOLDERS' EQUITY (Tables)

6 Months Ended

Jun. 30, 2017

Equity [Abstract]

Summary of Stock Option Activity

A summary of stock option activity follows:



	Stock Options (1)		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Outstanding, December 31, 2016	1,115		$	6.13
Granted	—		$	—
Exercised	(78	)	$	11.01
Forfeited	(2	)	$	4.06
Outstanding, June 30, 2017	1,035		$	5.76	5.7	$	11,020
Exercisable, June 30, 2017	702		$	5.15	4.6	$	7,897
Unvested, June 30, 2017	373		$	7.62	8.2	$	3,280


(1)	Market-based performance stock options are included at the 100% attainment level. Attainment of the maximum performance targets and market achievements would result in the issuance of an additional 40 shares of Class A common stock currently included in unvested.

Summary of Restricted Stock, Restricted Stock Unit and Performance-based Stock Unit Activity

A summary of restricted stock, restricted stock unit and performance stock unit activity follows:



	Restricted Stock, Restricted Stock Units, and Performance Stock Units (1)		Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Outstanding, December 31, 2016	1,099		$	7.03
Granted	438		$	12.32
Class A Common Stock Vested	(370	)	$	5.07
Forfeited	(18	)	$	5.99
Outstanding, June 30, 2017	1,149		$	9.63	1.8	$	7,784
Unvested, June 30, 2017	1,512		$	10.32	1.9	$	9,190


(1)	Market-based performance stock unit grants are included at the 100% attainment level. Attainment of the maximum performance targets and market achievements would result in the issuance of an additional 363 shares of Class A common stock currently included in unvested.

Summary of Changes in Balances of Each Component of Accumulated Other Comprehensive Loss

A summary of the changes in the balances of each component of accumulated other comprehensive loss, net of tax follows:




	Marketable Securities			Interest Rate Swaps
Balance, December 31, 2016	$	(68	)	$	—
Other comprehensive income (loss) before reclassifications	46			(472		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			208
Net current-period other comprehensive income (loss)	46			(264		)
Balance, June 30, 2017	$	(22	)	$	(264	)

Summary of Reclassifications Out of Accumulated Other Comprehensive Loss

A summary of reclassifications out of accumulated other comprehensive loss, net of tax follows:



	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
Details About Accumulated Other Comprehensive Loss Components	Amounts Reclassified Out of Accumulated Other Comprehensive Loss								Affected Line Item in the Consolidated Statements of Operations
Interest rate swaps	$	138	$	—	$	208	$	—	Interest expense
	138		—		208		—		(Loss) income before income taxes
	—		—		—		—		Provision for income taxes
	$	138	$	—	$	208	$	—	Net (loss) income

EARNINGS PER SHARE (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Summary of Numerator and Denominators Used in Computation of Earnings Per Share

A summary of the numerator and denominators used in the computation of earnings per share follows:



	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
Numerator:
Net (loss) income attributable to common stockholders	$	(53,675	)	$	5,195		$	(53,900	)	$	(2,413	)
Denominators:
Number of shares outstanding, end of period:
Class A common stock	41,042			40,500			41,042			40,500
Class B common stock	988			988			988			988
Unvested restricted stock	(88		)	(115		)	(88		)	(115		)
Effect of weighted average shares outstanding	(131		)	(241		)	(244		)	(309		)
Basic weighted average common shares outstanding	41,811			41,132			41,698			41,064
Impact of potentially dilutive securities:
Dilutive effect of stock options and other stock awards	—			466			—			—
Diluted weighted average common shares outstanding	41,811			41,598			41,698			41,064
Anti-dilutive potentially issuable shares	2,586			473			2,586			2,211

OTHER ITEMS AND CHARGES (Tables)

6 Months Ended

Jun. 30, 2017

Environmental Remediation Obligations [Abstract]

Environmental Exit Costs by Cost



	Three Months Ended June 30,					Six Months Ended June 30,
	2017		2016			2017		2016
Asset impairment charge (1)	$	47,999	$	—		$	47,999	$	—
Project development charge (2)	9,148		—			9,148		—
Environmental remediation charge (3)	6,379		—			6,379		—
Legal and transaction costs (4)	588		—			588		—
Southbridge landfill closure charge	$	64,114	$	—	—	$	64,114	$	—

(1)


(2)	We wrote-off deferred costs associated with landfill permitting activities no longer deemed viable.


(3)	We recorded an environmental remediation charge associated with the future installation of a municipal waterline. See Note 8, Commitments and Contingencies for additional disclosure.


(4)	We incurred legal and other transaction costs associated with various matters as part of the Southbridge landfill closure. See Note 8, Commitments and Contingencies for additional disclosure.

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis

Summaries of our financial assets and liabilities that are measured at fair value on a recurring basis follow:



	Fair Value Measurement at June 30, 2017 Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Interest rate derivatives	$	—	$	95	$	—
Restricted investments - landfill closure	1,065		—		—
Total	$	1,065	$	95	$	—
Liabilities:
Interest rate derivatives	$	—	$	373	$	—



	Fair Value Measurement at December 31, 2016 Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Restricted investments - landfill closure	$	1,002	$	—	$	—

Fair Value Measurements, Nonrecurring

A summary of our financial assets and liabilities that are measured at fair value on a non-recurring basis follows:



	Fair Value Measurement at June 30, 2017 Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Southbridge landfill asset group - long-lived assets	$	—	$	—	$	8,017

SEGMENT REPORTING (Tables)

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Summary of Financial Information by Reportable Segment

Three Months Ended June 30, 2017



Segment	Outside revenues		Inter-company revenue			Depreciation and amortization		Operating income (loss)			Total assets
Eastern	$	46,574	$	13,202		$	6,423	$	(60,324	)	$	158,042
Western	64,372		18,625			7,586		10,770			328,207
Recycling	16,211		(245		)	1,019		1,064			50,398
Other	26,859		611			840		1,211			52,230
Eliminations	—		(32,193		)	—		—			—
Total	$	154,016	$	—		$	15,868	$	(47,279	)	$	588,877

Three Months Ended June 30, 2016



Segment	Outside revenues		Inter-company revenue			Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	45,405	$	11,692		$	7,138	$	3,079	$	208,316
Western	59,460		17,889			6,908		10,175		319,480
Recycling	12,816		302			1,040		468		48,782
Other	26,989		404			716		1,874		55,043
Eliminations	—		(30,287		)	—		—		—
Total	$	144,670	$	—		$	15,802	$	15,596	$	631,621

Six Months Ended June 30, 2017




Segment	Outside revenues		Inter-company revenue			Depreciation and amortization		Operating income (loss)			Total assets
Eastern	$	85,260	$	22,724		$	11,827	$	(60,304	)	$	158,042
Western	118,515		34,407			14,191		14,859			328,207
Recycling	32,846		(489		)	2,022		2,647			50,398
Other	51,197		985			1,677		2,084			52,230
Eliminations	—		(57,627		)	—		—			—
Total	$	287,818	$	—		$	29,717	$	(40,714	)	$	588,877

Six Months Ended June 30, 2016




Segment	Outside revenues		Inter-company revenue			Depreciation and amortization		Operating income (loss)			Total assets
Eastern	$	84,392	$	21,229		$	13,327	$	2,291		$	208,316
Western	111,922		32,740			13,398		13,169			319,480
Recycling	23,454		933			2,132		(606		)	48,782
Other	50,335		684			1,398		2,716			55,043
Eliminations	—		(55,586		)	—		—			—
Total	$	270,103	$	—		$	30,255	$	17,570		$	631,621

Summary of Revenues Attributable to Services Provided by Company

A summary of our revenues attributable to services provided follows:



	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
Collection	$	66,308	$	63,685	$	126,145	$	121,536
Disposal	42,172		39,384		73,454		71,637
Power generation	1,554		1,460		2,906		3,167
Processing	2,137		1,747		3,796		2,720
Solid waste operations	112,171		106,276		206,301		199,060
Organics	11,005		12,171		20,219		21,106
Customer solutions	14,629		13,407		28,452		26,483
Recycling	16,211		12,816		32,846		23,454
Total revenues	$	154,016	$	144,670	$	287,818	$	270,103

BASIS OF PRESENTATION (Details)	6 Months Ended
BASIS OF PRESENTATION (Details)	Jun. 30, 2017 regional_operating_segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of regional operating segments	2

BUSINESS COMBINATIONS - Additional Information (Details) - transfer_station	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2017
Eastern \| Collection Business
Business Acquisition [Line Items]
Number of transfer stations acquired		1
Western \| Solid Waste Collection
Business Acquisition [Line Items]
Number of transfer stations acquired		1
Western \| Transfer Stations Acquisition
Business Acquisition [Line Items]
Number of transfer stations acquired	3

BUSINESS COMBINATIONS - Summary of Purchase Price Paid for Acquisitions (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Allocated as follows:
Excess purchase price allocated to goodwill	$ 121,700		$ 119,899
Transfer Stations Acquisition
Purchase Price:
Cash paid for acquisitions	2,664	$ 2,439
Notes payable	2,400	0
Other non-cash considerations	100	0
Holdbacks	196	400
Total	5,360	2,839
Allocated as follows:
Current assets	0	40
Land	0	353
Building	0	1,360
Equipment	2,291	269
Intangible assets	1,317	0
Other liabilities, net	(49)	(106)
Fair value of assets acquired and liabilities assumed	3,559	1,916
Excess purchase price allocated to goodwill	$ 1,801	$ 923

BUSINESS COMBINATIONS - Schedule of Unaudited Pro forma Combined Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Business Combinations [Abstract]
Revenue	$ 154,729	$ 145,911	$ 289,715	$ 273,408
Operating (loss) income	(47,273)	15,625	(40,685)	17,548
Net (loss) income attributable to common stockholders	$ (53,673)	$ 5,208	$ (53,889)	$ (2,435)
Basic weighted average common shares outstanding (in shares)	41,811	41,132	41,698	41,064
Basic earnings per share attributable to common stockholders (in USD per share)	$ (1.28)	$ 0.13	$ (1.29)	$ (0.06)
Diluted weighted average shares outstanding (in shares)	41,811	41,598	41,698	41,064
Diluted earnings per share attributable to common stockholders (in USD per share)	$ (1.28)	$ 0.13	$ (1.29)	$ (0.06)

GOODWILL AND INTANGIBLE ASSETS - Schedule of Activity and Balances Related to Goodwill by Operating Segment (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 119,899
Acquisitions	1,801
Goodwill, ending balance	121,700
Eastern
Goodwill [Roll Forward]
Goodwill, beginning balance	17,429
Acquisitions	1,764
Goodwill, ending balance	19,193
Western
Goodwill [Roll Forward]
Goodwill, beginning balance	88,426
Acquisitions	37
Goodwill, ending balance	88,463
Recycling
Goodwill [Roll Forward]
Goodwill, beginning balance	12,315
Acquisitions	0
Goodwill, ending balance	12,315
Other
Goodwill [Roll Forward]
Goodwill, beginning balance	1,729
Acquisitions	0
Goodwill, ending balance	$ 1,729

GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets by Intangible Asset Type (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 35,130	$ 33,665
Less accumulated amortization	(26,961)	(25,969)
Intangible assets, net	8,169	7,696
Covenants Not-to-Compete
Finite-Lived Intangible Assets [Line Items]
Intangible assets	17,941	17,594
Less accumulated amortization	(16,627)	(16,402)
Intangible assets, net	1,314	1,192
Client Lists
Finite-Lived Intangible Assets [Line Items]
Intangible assets	17,189	16,071
Less accumulated amortization	(10,334)	(9,567)
Intangible assets, net	$ 6,855	$ 6,504

GOODWILL AND INTANGIBLE ASSETS - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible amortization expenses	$ 505	$ 519	$ 991	$ 1,043

GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Amortization Expense Estimated (Detail) $ in Thousands	Jun. 30, 2017 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Estimated Future Amortization Expense, For the fiscal year ending December 31, 2017	$ 1,048
Estimated Future Amortization Expense, For the fiscal year ending December 31, 2018	1,925
Estimated Future Amortization Expense, For the fiscal year ending December 31, 2019	1,563
Estimated Future Amortization Expense, For the fiscal year ending December 31, 2020	1,359
Estimated Future Amortization Expense, For the fiscal year ending December 31, 2021	1,094
Estimated Future Amortization Expense, Thereafter	$ 1,180

ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE - Summary of Changes to Accrued Capping, Closure and Post-Closure Liabilities (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	$ 44,207	$ 41,041
Obligations incurred	1,310	1,143
Revisions in estimates	9,598	(56)
Accretion expense	1,939	1,782
Obligations settled	(307)	(432)
Ending balance	$ 56,747	$ 43,478

OTHER ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
Self insurance reserve - current portion	$ 4,229	$ 3,836
Other accrued liabilities	16,368	11,080
Total other accrued liabilities	$ 20,597	$ 14,916

LONG-TERM DEBT - Summary of Components of Long-Term Debt and Capital Leases by Debt Instrument (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt and capital lease	$ 519,158	$ 525,583
Less—unamortized discount and debt issuance costs	16,550	16,936
Long-term debt and capital leases less unamortized discount and debt issuance costs	502,608	508,647
Less—current maturities of long-term debt	5,016	4,686
Non current portion of long term debt and capital lease obligation	497,592	503,961
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt and capital lease	55,600	62,600
Less—unamortized discount and debt issuance costs	4,452	4,965
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 due December 2044 - fixed rate interest period through 2019; bearing interest at 3.75%
Debt Instrument [Line Items]
Long-term debt and capital lease	25,000	25,000
Less—unamortized discount and debt issuance costs	1,128	1,221
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2 due December 2044 - fixed rate interest period through 2026; bearing interest at 3.125%
Debt Instrument [Line Items]
Long-term debt and capital lease	15,000	15,000
Less—unamortized discount and debt issuance costs	541	571
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3 due January 2025 - fixed rate interest period through 2025; bearing interest at 5.25%
Debt Instrument [Line Items]
Long-term debt and capital lease	25,000	0
Less—unamortized discount and debt issuance costs	645	0
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015 due August 2035 - fixed rate interest period through 2025; bearing interest at 5.125%
Debt Instrument [Line Items]
Long-term debt and capital lease	15,000	15,000
Less—unamortized discount and debt issuance costs	726	760
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 due April 2036 - fixed rate interest period through 2018; bearing interest at 4.75%
Debt Instrument [Line Items]
Long-term debt and capital lease	16,000	16,000
Less—unamortized discount and debt issuance costs	589	605
Business Finance Authority of the State of New Hampshire Solid Waste Disposal Revenue Bonds Series 2013 due April 2029 - fixed rate interest period through 2019; bearing interest at 4.00%
Debt Instrument [Line Items]
Long-term debt and capital lease	11,000	11,000
Less—unamortized discount and debt issuance costs	499	563
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-2 due January 2025 - fixed rate interest period through 2017; bore interest at 6.25%
Debt Instrument [Line Items]
Long-term debt and capital lease	0	21,400
Less—unamortized discount and debt issuance costs	0	502
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-1; letter of credit backed due January 2025 - bore interest at SIFMA Index
Debt Instrument [Line Items]
Long-term debt and capital lease	0	3,600
Less—unamortized discount and debt issuance costs	0	31
Capital leases maturing through April 2023; bearing interest at up to 7.70%
Debt Instrument [Line Items]
Long-term debt and capital lease	5,363	5,534
Notes payable maturing through June 2027; bearing interest at up to 7.00%
Debt Instrument [Line Items]
Long-term debt and capital lease	2,945	449
Term Loan B Facility due October 2023; bearing interest at LIBOR plus 2.75% and 3.00%, respectively \| Secured Debt
Debt Instrument [Line Items]
Long-term debt and capital lease	348,250	350,000
Less—unamortized discount and debt issuance costs	7,970	7,718
Unamortized discount	$ 1,598	$ 1,712

LONG-TERM DEBT - Summary of Components of Long-Term Debt and Capital Leases by Debt Instruments, Interest Rates (Detail)	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument variable rate basis (percentage)	2.75%	3.00%
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 due December 2044 - fixed rate interest period through 2019; bearing interest at 3.75%
Debt Instrument [Line Items]
Debt instrument stated percentage	3.75%
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2 due December 2044 - fixed rate interest period through 2026; bearing interest at 3.125%
Debt Instrument [Line Items]
Debt instrument stated percentage	3.125%
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3 due January 2025 - fixed rate interest period through 2025; bearing interest at 5.25%
Debt Instrument [Line Items]
Debt instrument stated percentage	5.25%
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015 due August 2035 - fixed rate interest period through 2025; bearing interest at 5.125%
Debt Instrument [Line Items]
Debt instrument stated percentage	5.125%
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 due April 2036 - fixed rate interest period through 2018; bearing interest at 4.75%
Debt Instrument [Line Items]
Debt instrument stated percentage	4.75%
Business Finance Authority of the State of New Hampshire Solid Waste Disposal Revenue Bonds Series 2013 due April 2029 - fixed rate interest period through 2019; bearing interest at 4.00%
Debt Instrument [Line Items]
Debt instrument stated percentage	4.00%
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-2 due January 2025 - fixed rate interest period through 2017; bore interest at 6.25%
Debt Instrument [Line Items]
Debt instrument stated percentage		6.25%
Capital leases maturing through April 2023; bearing interest at up to 7.70%
Debt Instrument [Line Items]
Debt instrument stated percentage	7.70%
Notes payable maturing through June 2027; bearing interest at up to 7.00%
Debt Instrument [Line Items]
Debt instrument stated percentage	7.00%
Term Loan B Facility due October 2023; bearing interest at LIBOR plus 2.75% and 3.00%, respectively \| Secured Debt
Debt Instrument [Line Items]
Debt instrument variable rate basis (percentage)	2.75%	3.00%

LONG-TERM DEBT - Additional Information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
LONG-TERM DEBT - Additional Information (Detail)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016	Mar. 31, 2017 USD ($) interest_rate_derviative
Debt Instrument [Line Items]
Loss on debt extinguishment	$ 46,000	$ 593,000	$ 517,000	$ 545,000
Secured Debt \| Term Loan B Facility due October 2023; bearing interest at LIBOR plus 2.75% and 3.00%, respectively
Debt Instrument [Line Items]
Aggregate principal amount	$ 350,000,000		$ 350,000,000
Debt instrument variable rate basis (percentage)			2.75%		3.00%
Secured Debt \| Term Loan B Facility due October 2023; bearing interest at LIBOR plus 3.00%
Debt Instrument [Line Items]
Net leverage ratio	3.75		3.75
New York Bonds 2016 \| Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-2 due January 2025 - fixed rate interest period through 2017; bore interest at 6.25%
Debt Instrument [Line Items]
Aggregate principal amount						$ 21,400,000
New York Bonds 2016 \| Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3 due January 2025 - fixed rate interest period through 2025; bearing interest at 5.25%
Debt Instrument [Line Items]
Aggregate principal amount						$ 25,000,000
Debt instrument interest rate percentage						5.25%
Senior Subordinated Notes Due 2019 Notes
Debt Instrument [Line Items]
Debt instrument interest rate percentage		7.75%		7.75%
Early retirement of debt		$ 19,730,000		$ 19,730,000
Maine Bonds \| Variable Rate Bonds
Debt Instrument [Line Items]
Aggregate principal amount						$ 3,600,000
Cash Flow Hedging
Debt Instrument [Line Items]
Derivative asset fair value	$ 95,000		$ 95,000
Derivative liability fair value	$ 373,000		373,000
Cash Flow Hedging \| Interest Rate Derivative
Debt Instrument [Line Items]
Interest rate derivatives entered into \| interest_rate_derviative						3
Notional amount						$ 60,000,000
Weighted average percentage rate paid						1.95%
Cash Flow Hedging \| Interest Rate Derivative - February 2021
Debt Instrument [Line Items]
Notional amount						$ 35,000,000
Cash Flow Hedging \| Interest Rate Derivative - February 2022
Debt Instrument [Line Items]
Notional amount						$ 25,000
LIBOR \| Secured Debt \| Term Loan B Facility due October 2023; bearing interest at LIBOR plus 3.00%
Debt Instrument [Line Items]
Debt instrument variable rate basis (percentage)	2.75%
LIBOR \| Cash Flow Hedging \| Interest Rate Derivative
Debt Instrument [Line Items]
Floor interest rate received						1.00%
LIBOR Floor \| Secured Debt \| Term Loan B Facility due October 2023; bearing interest at LIBOR plus 3.00%
Debt Instrument [Line Items]
Debt instrument variable rate basis (percentage)	1.00%
Base Rate \| Secured Debt \| Term Loan B Facility due October 2023; bearing interest at LIBOR plus 3.00%
Debt Instrument [Line Items]
Decrease in applicable interest margin (basis points)	0.25%
Debt instrument variable rate basis (percentage)	1.75%
Revolving Credit Facility \| Line of Credit \| Revolving Credit Facility due October 2021
Debt Instrument [Line Items]
Revolving facility amount	$ 160,000,000		$ 160,000,000
Consolidated net leverage ratio of 3.75x or less \| LIBOR \| Secured Debt \| Term Loan B Facility due October 2023; bearing interest at LIBOR plus 3.00%
Debt Instrument [Line Items]
Debt instrument variable rate basis (percentage)	2.50%
Consolidated net leverage ratio of 3.75x or less \| LIBOR Floor \| Secured Debt \| Term Loan B Facility due October 2023; bearing interest at LIBOR plus 3.00%
Debt Instrument [Line Items]
Debt instrument variable rate basis (percentage)	1.00%
Consolidated net leverage ratio of 3.75x or less \| Base Rate \| Secured Debt \| Term Loan B Facility due October 2023; bearing interest at LIBOR plus 3.00%
Debt Instrument [Line Items]
Debt instrument variable rate basis (percentage)	1.50%

COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) $ in Thousands			1 Months Ended		12 Months Ended
	Apr. 28, 2017 USD ($)	Apr. 26, 2017 USD ($)	Apr. 30, 2011 USD ($)	May 31, 2009 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Jan. 29, 2016	Dec. 31, 2015 USD ($)	Dec. 20, 2000 a
Southbridge Landfill
Loss Contingencies [Line Items]
Environmental remediation liability						$ 6,379
Risk free interest percentage rate						2.60%
Potsdam Environmental Remediation Liability
Loss Contingencies [Line Items]
Amount of costs			$ 12,130	$ 10,219
Environmental remediation liability						$ 5,861	$ 5,866	$ 5,221		$ 5,221
Risk free interest percentage rate						1.50%
Scrap yard and solid waste transfer station (in acres) \| a											25
Remediation activities, participant share percentage									15.00%
Maximum \| Southbridge Landfill \| Scenario, Forecast
Loss Contingencies [Line Items]
Future cash payments					$ 3,069
Notice of Intent to Sue under the Resource Conservation and Recovery Act \| Maximum
Loss Contingencies [Line Items]
Amount of costs		$ 5,000
MADEP and Casella Waste System \| Notice of Intent to Sue under the Resource Conservation and Recovery Act \| Maximum
Loss Contingencies [Line Items]
Amount of costs		$ 10,000
21E Settlement and Water System Construction Funding Agreement \| Bonds
Loss Contingencies [Line Items]
Bond period	20 years
21E Settlement and Water System Construction Funding Agreement \| Bonds \| Maximum
Loss Contingencies [Line Items]
Amount of costs	$ 5,000
Town of Southbridge, Massachusetts Landfill
Loss Contingencies [Line Items]
Total costs incurred						$ 3,745

COMMITMENTS AND CONTINGENCIES - Summary of Environmental Liability Associated with Potsdam (Detail) - Potsdam Environmental Remediation Liability - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	$ 5,866	$ 5,221
Obligations settled	(5)	0
Ending balance	$ 5,861	$ 5,221

STOCKHOLDERS' EQUITY - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Stock Options
Limited Partners' Capital Account [Line Items]
Stock-based compensation expense	$ 176	$ 146	$ 347	$ 292
Aggregate intrinsic value of options exercised	153		206
Unrecognized stock-based compensation expense	771		771
Restricted Stock, Restricted Stock Units, and Performance-Based Stock Units
Limited Partners' Capital Account [Line Items]
Stock-based compensation expense	1,441	729	2,499	1,278
Restricted Stock and Restricted Stock Unit
Limited Partners' Capital Account [Line Items]
Total fair value of other stock awards vested	1,362		4,770
Unrecognized stock-based compensation expense	4,437		$ 4,437
Market-based Performance Stock Options
Limited Partners' Capital Account [Line Items]
Weighted average fair value (in dollars per share)			$ 12.51
Risk free interest rate			1.45%
Expected volatility			32.80%
Dividend yield			0.00%
Amended and Restated 1997 Employee Stock Purchase Plan
Limited Partners' Capital Account [Line Items]
Stock-based compensation expense	37	$ 26	$ 65	$ 52
Non-Employee Director \| Restricted Stock Awards
Limited Partners' Capital Account [Line Items]
Options vesting period			3 years
Minimum \| 2016 Plan
Limited Partners' Capital Account [Line Items]
Options vesting period			1 year
Maximum \| Performance-Based Stock Units
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation expense	$ 6,980		$ 6,980
Maximum \| 2016 Plan
Limited Partners' Capital Account [Line Items]
Options granted period			10 years
Options vesting period			4 years
Weighted Average \| Stock Options
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation expense, weighted average period			9 months
Weighted Average \| Restricted Stock and Restricted Stock Unit
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation expense, weighted average period			1 year 7 months 4 days
Weighted Average \| Performance-Based Stock Units
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation expense, weighted average period			2 years
Class A Common Stock \| 2016 Plan
Limited Partners' Capital Account [Line Items]
Common stock, authorized shares (in shares)					2,250,000
Number of shares available for future grant (in shares)	1,897,000		1,897,000
Class A Common Stock \| 2006 Incentive Plan
Limited Partners' Capital Account [Line Items]
Common stock, additional authorized shares (in shares)					2,723,000

STOCKHOLDERS' EQUITY - Summary of Stock Option Activity (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($) $ / shares shares
Stock Options
Beginning balance, outstanding (in shares)	1,115
Granted (in shares)	0
Exercised (in shares)	(78)
Forfeited (in shares)	(2)
Ending balance, outstanding (in shares)	1,035
Exercisable at end of period (in shares)	702
Unvested at end of period (in shares)	373
Weighted Average Exercise Price
Beginning balance, Outstanding (in USD per share) \| $ / shares	$ 6.13
Granted (in USD per share) \| $ / shares	0.00
Exercised (in USD per share) \| $ / shares	11.01
Forfeited (in USD per share) \| $ / shares	4.06
Ending balance, Outstanding (in USD per share) \| $ / shares	5.76
Exercisable at end of period (in USD per share) \| $ / shares	5.15
Unvested at end of period (in USD per share) \| $ / shares	$ 7.62
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contractual Term, Outstanding	5 years 8 months
Weighted Average Remaining Contractual Term, Exercisable	4 years 6 months 20 days
Weighted Average Remaining Contractual Term, Unvested	8 years 1 month 27 days
Aggregate Intrinsic Value, Outstanding at end of period \| $	$ 11,020
Aggregate Intrinsic Value, Exercisable at end of period \| $	7,897
Aggregate Intrinsic Value, Unvested at end of period \| $	$ 3,280
Market-based Performance Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Percentage of vesting of share-based compensation awards	100.00%
Issuance of additional shares (in shares)	40

STOCKHOLDERS' EQUITY - Summary of Restricted Stock, Restricted Stock Unit and Performance-based Stock Unit Activity (Detail) - Restricted Stock, Restricted Stock Units, and Performance-Based Stock Units $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($) $ / shares shares
Restricted Stock, Restricted Stock Units, and Performance-Based Stock Units
Outstanding at beginning of period (in shares) \| shares	1,099
Granted (in shares) \| shares	438
Forfeited (in shares) \| shares	(18)
Outstanding at end of period (in shares) \| shares	1,149
Unvested, at end of period (in shares) \| shares	1,512
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in USD per share) \| $ / shares	$ 7.03
Granted (in USD per share) \| $ / shares	12.32
Forfeited (in USD per share) \| $ / shares	5.99
Outstanding at end of period (in USD per share) \| $ / shares	9.63
Unvested at end of period (in USD per share) \| $ / shares	$ 10.32
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contractual Term, Outstanding	1 year 9 months 12 days
Weighted Average Remaining Contractual Term, Expected to vest	1 year 10 months 23 days
Aggregate Intrinsic Value, Outstanding at end of period \| $	$ 7,784
Aggregate Intrinsic Value, Unvested at end of period \| $	$ 9,190
Class A Common Stock
Restricted Stock, Restricted Stock Units, and Performance-Based Stock Units
Class A Common Stock Vested (in shares) \| shares	(370)
Weighted Average Grant Date Fair Value
Class A Common Stock Vested (in USD per share) \| $ / shares	$ 5.07

STOCKHOLDERS' EQUITY - Summary of Restricted Stock, Restricted Stock Unit and Performance-based Stock Unit Activity Footnote (Detail) - Performance-Based Stock Units shares in Thousands	6 Months Ended
	Jun. 30, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based stock units, percentage of attainment level	100.00%
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance-based stock units	363

STOCKHOLDERS' EQUITY - Summary of Changes in Balances of Each Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			$ (24,550)
Other comprehensive (loss) income, net of tax	$ (200)	$ 44	(218)	$ (39)
Ending balance	(74,633)		(74,633)
Marketable Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(68)
Other comprehensive income (loss) before reclassifications			46
Amounts reclassified from accumulated other comprehensive income (loss)			0
Other comprehensive (loss) income, net of tax			46
Ending balance	(22)		(22)
Interest Rate Swaps
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			0
Other comprehensive income (loss) before reclassifications			(472)
Amounts reclassified from accumulated other comprehensive income (loss)			208
Other comprehensive (loss) income, net of tax			(264)
Ending balance	$ (264)		$ (264)

STOCKHOLDERS' EQUITY - Summary of Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 6,334	$ 10,004	$ 12,784	$ 20,034
(Loss) income before income taxes	53,281	(5,422)	53,489	2,341
Provision for income taxes	394	230	411	81
Net (loss) income	53,675	(5,192)	53,900	2,422
Interest rate swaps \| Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest \| Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	138	0	208	0
(Loss) income before income taxes	138	0	208	0
Provision for income taxes	0	0	0	0
Net (loss) income	$ 138	$ 0	$ 208	$ 0

EARNINGS PER SHARE - Summary of Numerator and Denominators Used in Computation of Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Numerator:
Net (loss) income attributable to common stockholders	$ (53,675)	$ 5,195	$ (53,900)	$ (2,413)
Number of shares outstanding, end of period:
Unvested restricted stock (in shares)	(88)	(115)	(88)	(115)
Effect of weighted average shares outstanding (in shares)	(131)	(241)	(244)	(309)
Basic weighted average common shares outstanding (in shares)	41,811	41,132	41,698	41,064
Impact of potentially dilutive securities:
Dilutive effect of stock options and other stock awards (in shares)	0	466	0	0
Diluted weighted average shares outstanding (in shares)	41,811	41,598	41,698	41,064
Antidilutive potentially issuable shares (in shares)	2,586	473	2,586	2,211
Class A Common Stock
Number of shares outstanding, end of period:
Common stock, outstanding shares (in shares)	41,042	40,500	41,042	40,500	40,572
Class B Common Stock
Number of shares outstanding, end of period:
Common stock, outstanding shares (in shares)	988	988	988	988	988

OTHER ITEMS AND CHARGES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
OTHER ITEMS AND CHARGES (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Environmental Remediation Obligations [Abstract]
Asset impairment charge	$ 47,999	$ 0	$ 47,999	$ 0
Project development charge	9,148	0	9,148	0
Environmental remediation charge	6,379	0	6,379	0
Legal and transaction costs	588	0	588	0
Southbridge landfill closure charge	$ 64,114	$ 0	$ 64,114	$ 0

FAIR VALUE OF FINANCIAL INSTRUMENTS - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets:
Restricted assets	$ 1,065	$ 1,002
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Fair Value, Measurements, Recurring
Assets:
Interest rate derivatives	0
Total	1,065
Liabilities:
Interest rate derivatives	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Fair Value, Measurements, Recurring \| Restricted investments - landfill closure
Assets:
Restricted assets	1,065	1,002
Significant Other Observable Inputs (Level 2) \| Fair Value, Measurements, Recurring
Assets:
Interest rate derivatives	95
Total	95
Liabilities:
Interest rate derivatives	373
Significant Other Observable Inputs (Level 2) \| Fair Value, Measurements, Recurring \| Restricted investments - landfill closure
Assets:
Restricted assets	0	0
Significant Unobservable Inputs (Level 3) \| Fair Value, Measurements, Recurring
Assets:
Interest rate derivatives	0
Total	0
Liabilities:
Interest rate derivatives	0
Significant Unobservable Inputs (Level 3) \| Fair Value, Measurements, Recurring \| Restricted investments - landfill closure
Assets:
Restricted assets	$ 0	$ 0

FAIR VALUE OF FINANCIAL INSTRUMENTS - Additional Information (Detail) $ in Thousands	Jun. 30, 2017 USD ($)
Significant Other Observable Inputs (Level 2)
Debt Instrument [Line Items]
Carrying value of revolver debt	$ 55,600
Fair Value \| Fixed Rate Bonds
Debt Instrument [Line Items]
Fair value of fixed rate debt	106,183
Carrying Value \| Fixed Rate Bonds
Debt Instrument [Line Items]
Fair value of fixed rate debt	107,000
Term Loan B Facility due October 2023; bearing interest at LIBOR plus 2.75% and 3.00%, respectively \| Fair Value \| Secured Debt \| Significant Other Observable Inputs (Level 2)
Debt Instrument [Line Items]
Fair value of fixed rate debt	348,250
Term Loan B Facility due October 2023; bearing interest at LIBOR plus 2.75% and 3.00%, respectively \| Carrying Value \| Secured Debt
Debt Instrument [Line Items]
Fair value of fixed rate debt	$ 349,556

FAIR VALUE OF FINANCIAL INSTRUMENTS - Assets Measured at Fair Value on Non-Recurring Basis (Details) - Fair Value, Measurements, Nonrecurring - Southbridge landfill asset group - long-lived assets $ in Thousands	Jun. 30, 2017 USD ($)
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Southbridge landfill asset group - long-lived assets	$ 0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Southbridge landfill asset group - long-lived assets	0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Southbridge landfill asset group - long-lived assets	$ 8,017

SEGMENT REPORTING - Summary of Financial Information by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 154,016	$ 144,670	$ 287,818	$ 270,103
Depreciation and amortization	15,868	15,802	29,717	30,255
Operating income (loss)	(47,279)	15,596	(40,714)	17,570
Total assets	588,877	631,621	588,877	631,621	$ 631,512
Operating Segments
Segment Reporting Information [Line Items]
Revenues			287,818	270,103
Operating Segments \| Eastern
Segment Reporting Information [Line Items]
Revenues	46,574	45,405	85,260	84,392
Depreciation and amortization	6,423	7,138	11,827	13,327
Operating income (loss)	(60,324)	3,079	(60,304)	2,291
Total assets	158,042	208,316	158,042	208,316
Operating Segments \| Western
Segment Reporting Information [Line Items]
Revenues	64,372	59,460	118,515	111,922
Depreciation and amortization	7,586	6,908	14,191	13,398
Operating income (loss)	10,770	10,175	14,859	13,169
Total assets	328,207	319,480	328,207	319,480
Operating Segments \| Recycling
Segment Reporting Information [Line Items]
Revenues	16,211	12,816	32,846	23,454
Depreciation and amortization	1,019	1,040	2,022	2,132
Operating income (loss)	1,064	468	2,647	(606)
Total assets	50,398	48,782	50,398	48,782
Operating Segments \| Other
Segment Reporting Information [Line Items]
Revenues	26,859	26,989	51,197	50,335
Depreciation and amortization	840	716	1,677	1,398
Operating income (loss)	1,211	1,874	2,084	2,716
Total assets	52,230	55,043	52,230	55,043
Inter-company revenue \| Eastern
Segment Reporting Information [Line Items]
Revenues	13,202	11,692	22,724	21,229
Inter-company revenue \| Western
Segment Reporting Information [Line Items]
Revenues	18,625	17,889	34,407	32,740
Inter-company revenue \| Recycling
Segment Reporting Information [Line Items]
Revenues	(245)	302	(489)	933
Inter-company revenue \| Other
Segment Reporting Information [Line Items]
Revenues	611	404	985	684
Eliminations
Segment Reporting Information [Line Items]
Revenues	(32,193)	(30,287)	(57,627)	(55,586)
Depreciation and amortization	0	0	0	0
Operating income (loss)	0	0	0	0
Total assets	$ 0	$ 0	$ 0	$ 0

SEGMENT REPORTING - Summary of Revenues Attributable to Services Provided by Company (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue from External Customer [Line Items]
Revenues	$ 154,016	$ 144,670	$ 287,818	$ 270,103
Collection
Revenue from External Customer [Line Items]
Revenues	66,308	63,685	126,145	121,536
Disposal
Revenue from External Customer [Line Items]
Revenues	42,172	39,384	73,454	71,637
Power generation
Revenue from External Customer [Line Items]
Revenues	1,554	1,460	2,906	3,167
Processing
Revenue from External Customer [Line Items]
Revenues	2,137	1,747	3,796	2,720
Solid waste operations
Revenue from External Customer [Line Items]
Revenues	112,171	106,276	206,301	199,060
Organics
Revenue from External Customer [Line Items]
Revenues	11,005	12,171	20,219	21,106
Customer solutions
Revenue from External Customer [Line Items]
Revenues	14,629	13,407	28,452	26,483
Recycling
Revenue from External Customer [Line Items]
Revenues	$ 16,211	$ 12,816	$ 32,846	$ 23,454