Clean Harbors (CLH) 10-Q4 Nov 152015 Q3 Quarterly reportFinancial data

Company Profile

DOCUMENT AND ENTITY INFORMATION

DOCUMENT AND ENTITY INFORMATION - shares	9 Months Ended
DOCUMENT AND ENTITY INFORMATION - shares	Sep. 30, 2015	Oct. 30, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	CLEAN HARBORS INC
Entity Central Index Key	822,818
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		57,587,689

UNAUDITED CONSOLIDATED BALANCE

UNAUDITED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 179,191	$ 246,879
Accounts receivable, net of allowances aggregating $30,271 and $25,661, respectively	600,283	557,131
Unbilled accounts receivable	41,562	40,775
Deferred costs	19,096	19,018
Inventories and supplies	150,255	168,663
Prepaid expenses and other current assets	44,880	57,435
Deferred tax assets	37,288	36,532
Total current assets	1,072,555	1,126,433
Property, plant and equipment, net	1,531,548	1,558,834
Other assets:
Deferred financing costs	15,121	17,580
Goodwill	447,918	452,669
Permits and other intangibles, net	518,995	530,080
Other	13,724	18,682
Total other assets	995,758	1,019,011
Total assets	3,599,861	3,704,278
Current liabilities:
Current portion of capital lease obligations	11	536
Accounts payable	295,476	267,329
Deferred revenue	62,837	62,966
Accrued expenses	244,790	219,549
Current portion of closure, post-closure and remedial liabilities	21,902	22,091
Total current liabilities	625,016	572,471
Other liabilities:
Closure and post-closure liabilities, less current portion of $5,403 and $4,999, respectively	47,861	45,702
Remedial liabilities, less current portion of $16,499 and $17,092, respectively	126,816	138,029
Long-term obligations	1,395,000	1,395,000
Deferred taxes, unrecognized tax benefits and other long-term liabilities	282,447	290,205
Total other liabilities	$ 1,852,124	$ 1,868,936
Commitments and contingent liabilities (See Note 14)
Stockholders’ equity:
Common stock, $.01 par value: authorized 80,000,000; shares issued and outstanding XXXXXXX and 58,903,482 shares, respectively	$ 577	$ 589
Shares held under employee participation plan	(469)	(469)
Additional paid-in capital	740,070	805,029
Accumulated other comprehensive loss	(229,555)	(110,842)
Accumulated earnings	612,098	568,564
Total stockholders’ equity	1,122,721	1,262,871
Total liabilities and stockholders’ equity	$ 3,599,861	$ 3,704,278

UNAUDITED CONSOLIDATED BALANCE3

UNAUDITED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Account Receivable, allowances aggregating	$ 30,271	$ 25,661
Closure and post-closure liabilities, current portion	5,403	4,999
Remedial liabilities, current portion	$ 16,499	$ 17,092
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized shares	80,000,000	80,000,000
Common stock, issued shares	57,664,992	58,903,482
Common stock, outstanding shares	57,664,992	58,903,482

UNAUDITED CONSOLIDATED STATEMEN

UNAUDITED CONSOLIDATED STATEMENTS OF (LOSS) INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues:
Service revenues	$ 760,667	$ 657,221	$ 2,158,344	$ 1,962,071
Product revenues	132,699	194,244	403,749	594,541
Total revenues	893,366	851,465	2,562,093	2,556,612
Cost of revenues (exclusive of items shown separately below)
Service revenues	523,676	440,261	1,484,936	1,333,443
Product revenues	110,970	158,146	348,905	497,633
Total cost of revenues	634,646	598,407	1,833,841	1,831,076
Selling, general and administrative expenses	93,113	99,701	321,246	334,394
Accretion of environmental liabilities	2,577	2,642	7,795	7,975
Depreciation and amortization	69,060	70,049	205,189	205,480
Goodwill impairment charge	0	123,414	31,992	123,414
Income (loss) from operations	93,970	(42,748)	162,030	54,273
Other (expense) income	(139)	613	(390)	4,136
Interest expense, net of interest income of $126, $174, $465 and $590, respectively	(19,017)	(19,494)	(57,704)	(58,430)
Income (loss) before provision for income taxes	74,814	(61,629)	103,936	(21)
Provision for income taxes	34,586	31,708	60,402	55,684
Net income (loss)	$ 40,228	$ (93,337)	$ 43,534	$ (55,705)
Earnings (loss) per share:
Basic (in USD per share)	$ 0.69	$ (1.55)	$ 0.74	$ (0.92)
Diluted (in USD per share)	$ 0.69	$ (1.55)	$ 0.74	$ (0.92)
Shares used to compute earnings (loss) per share - Basic	58,161	60,369	58,799	60,585
Shares used to compute earnings (loss) per share - Diluted	58,268	60,369	58,898	60,585

UNAUDITED CONSOLIDATED STATEME5

UNAUDITED CONSOLIDATED STATEMENTS OF (LOSS) INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Interest income	$ 126	$ 174	$ 465	$ 590

UNAUDITED CONSOLIDATED STATEME6

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 40,228	$ (93,337)	$ 43,534	$ (55,705)
Other comprehensive loss:
Unrealized gains on available-for-sale securities (net of taxes of $0, $18, $0, $159 respectively)	0	102	0	901
Reclassification adjustment for gains on available-for-sale securities included in net income (net of taxes of $0, $4, $0, $508 respectively)	0	(23)	0	(2,880)
Foreign currency translation adjustments	(53,541)	(49,171)	(118,713)	(52,582)
Other comprehensive loss	(53,541)	(49,092)	(118,713)	(54,561)
Comprehensive loss	$ (13,313)	$ (142,429)	$ (75,179)	$ (110,266)

UNAUDITED CONSOLIDATED STATEME7

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Unrealized gains (losses) on available-for-sale securities, taxes	$ 0	$ (18)	$ 0	$ (159)
Reclassification adjustment for gains on available-for-sale securities included in net income (net of taxes of $0, $4, $0, $508 respectively)	$ 0	$ 4	$ 0	$ 508

UNAUDITED CONSOLIDATED STATEME8

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income (loss)	$ 43,534	$ (55,705)
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	205,189	205,480
Goodwill impairment charge	31,992	123,414
Allowance for doubtful accounts	5,631	6,743
Amortization of deferred financing costs and debt discount	2,459	2,457
Accretion of environmental liabilities	7,795	7,975
Changes in environmental liability estimates	(2,200)	(2,991)
Deferred income taxes	(18,994)	8,506
Stock-based compensation	6,550	6,446
Excess tax benefit of stock-based compensation	(102)	(829)
Deferred Tax Expense from Stock Options Exercised	(78)	829
Net tax (deficiency) benefit on stock based awards	(1,800)	(1,500)
Other expense (income)	390	(4,136)
Environmental expenditures	(16,773)	(12,130)
Changes in assets and liabilities, net of acquisitions
Accounts receivable and unbilled accounts receivable	(63,222)	(35,708)
Inventories and supplies	14,708	(20,675)
Other current assets	18,706	(10,048)
Accounts payable	47,051	(53,352)
Other current and long-term liabilities	26,957	29,763
Net cash from operating activities	309,593	196,039
Cash flows from investing activities:
Additions to property, plant and equipment	(189,999)	(198,877)
Proceeds from sales of fixed assets	3,740	5,913
Proceeds from sales of marketable securities	0	12,947
Acquisitions, net of cash acquired	(79,610)	(6,150)
Additions to intangible assets, including costs to obtain or renew permits	(4,633)	(5,443)
Other	0	914
Net cash used in investing activities	(270,502)	(190,696)
Cash flows from financing activities:
Change in uncashed checks	(21,882)	(591)
Proceeds from exercise of stock options	397	0
Issuance of restricted shares, net of shares remitted	(2,027)	(2,668)
Repurchases of common stock	(69,155)	(48,329)
Proceeds from employee stock purchase plan	0	4,364
Repayment of long-term obligations	0	5,000
Payments on capital leases	(500)	(1,682)
Excess tax benefit of stock-based compensation	102	829
Net cash from financing activities	(93,065)	(53,077)
Effect of exchange rate change on cash	(13,714)	(4,318)
Decrease in cash and cash equivalents	(67,688)	(52,052)
Cash and cash equivalents, beginning of period	246,879	310,073
Cash and cash equivalents, end of period	179,191	258,021
Cash payments for interest and income taxes:
Interest paid	58,613	58,446
Income taxes paid	32,276	21,737
Non-cash investing and financing activities:
Accrual for repurchased shares	658	5,464
Property, plant and equipment accrued	29,549	23,976
Receivable for estimated purchase price adjustment	$ 2,518	$ 0

UNAUDITED CONSOLIDATED STATEME9

UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - 9 months ended Sep. 30, 2015 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Shares Held Under Employee Participation Plan	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Earnings
Balance at beginning of period at Dec. 31, 2014	$ 1,262,871	$ 589	$ (469)	$ 805,029	$ (110,842)	$ 568,564
Balance beginning of period (in shares) at Dec. 31, 2014		58,903
Increase (Decrease) in Stockholders' Equity
Net income (loss)	43,534					43,534
Other comprehensive loss	(118,713)				(118,713)
Stock-based compensation	6,550			6,550
Issuance of restricted shares, net of shares remitted	(2,027)	$ 1		(2,028)
Issuance of restricted shares, net of shares remitted (in shares)		94
Repurchases of common stock	$ (69,813)	$ (13)		(69,800)
Repurchases of common stock (in shares)	(1,300)	(1,344)
Exercise of stock options	$ 397	$ 0		397
Exercise of stock options (in shares)		12
Net tax deficiency on stock based awards	(78)			(78)
Balance at end of period at Sep. 30, 2015	$ 1,122,721	$ 577	$ (469)	$ 740,070	$ (229,555)	$ 612,098
Balance ending of period (in shares) at Sep. 30, 2015		57,665

BASIS OF PRESENTATION

BASIS OF PRESENTATION	9 Months Ended
BASIS OF PRESENTATION	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION The accompanying consolidated interim financial statements are unaudited and include the accounts of Clean Harbors, Inc. and its subsidiaries (collectively, “Clean Harbors,” the “Company” or "we") and have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) and, in the opinion of management, include all adjustments which are of a normal recurring nature, necessary for a fair presentation of the financial position, results of operations, and cash flows for the periods presented. Management has made estimates and assumptions affecting the amounts reported in the Company's consolidated interim financial statements and accompanying footnotes, actual results could differ from those estimates and judgments. The results for interim periods are not necessarily indicative of results for the entire year or any other interim periods. The financial statements presented herein should be read in connection with the financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014 , which includes the audited consolidated balance sheet as of December 31, 2014 from which the one presented herein was derived. On October 26, 2015, the Company announced the Oil Re-refining and Recycling segment will be renamed to Kleen Performance Products. As such, all current and historical results of the formerly named Oil Re-refining and Recycling segment are shown under the Kleen Performance Products heading within this report.

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES	9 Months Ended
SIGNIFICANT ACCOUNTING POLICIES	Sep. 30, 2015
Accounting Policies [Abstract]
SIGNIFICANT ACCOUNTING POLICIES	SIGNIFICANT ACCOUNTING POLICIES The Company's significant accounting policies are described in Note 2, "Significant Accounting Policies," in the Company's Annual Report on Form 10-K for the year ended December 31, 2014 . There have been no material changes in these policies or their application. Recent Accounting Pronouncements Standards implemented In April 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360) . The amendments in ASU 2014-08 provide guidance for the recognition and disclosure of discontinued operations. The adoption of ASU 2014-08 did not have an impact on the Company's consolidated financial statements. Standards to be implemented In May 2014, FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) . ASU 2014-09 outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. In August 2015, FASB issued ASU 2015-14 which deferred the effective date of ASU 2014-09 for all entities by one year. This new guidance is currently effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2017. In February 2015, the FASB issued ASU 2015-02, Consolidation (Topic 810) . The amendment provides guidance regarding amendments to the consolidation analysis. The amendments in this update are currently effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2015. The Company is currently evaluating the impact that the above standards to be implemented will have on the Company's consolidated financial statements. In April 2015, FASB issued ASU 2015-03, Interest - Imputation of Interest (Subtopic 835-30). The amendment provides guidance that requires debt issuance costs related to a recognized debt liability to be presented in the balance sheet as a direct deduction from the debt liability rather than as an asset. The recognition and measurement guidance for debt issuance costs are not affected by the accounting standard update. The standard will be effective for annual periods and interim periods within those annual periods beginning after December 15, 2015, with early adoption permitted. The revised standard will be adopted by the Company on January 1, 2016, at which time it will be applied retrospectively and will require reclassifications within the Company’s consolidated balance sheets. The revised standard only affects presentation and therefore will not have an impact on the Company’s results of operations. In July 2015, FASB issued ASU 2015-11, Inventory (Topic 330) . The amendment provides guidance regarding the measurement of inventory. Entities should measure inventory within the scope of this update at the lower of cost and net realizable value. The amendments in this update are currently effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2016. Adoption is not expected to have a material impact on the Company's consolidated financial statements. In September 2015, FASB issued ASU 2015-16, Business Combinations (Topic 805) . The amendment provides guidance to simplify the accounting for adjustments made to provisional amounts recognized in a business combination. This amendment eliminates the requirement to retrospectively account for those adjustments. The amendment in this update is currently effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2015. Adoption is not expected to have a material impact on the Company's consolidated financial statements.

BUSINESS COMBINATIONS

BUSINESS COMBINATIONS	9 Months Ended
BUSINESS COMBINATIONS	Sep. 30, 2015
Business Combinations [Abstract]
BUSINESS COMBINATIONS	BUSINESS COMBINATIONS 2015 Acquisition On April 11, 2015, the Company completed the acquisition of Heckmann Environmental Services, Inc. (“HES”) and Thermo Fluids Inc. (“TFI”), a wholly-owned subsidiary of HES. The acquisition was accomplished through a purchase by Safety-Kleen, Inc., a wholly-owned subsidiary of the Company, of all of the issued and outstanding shares of HES from Nuverra Environmental Solutions, Inc. HES is a holding company that does not conduct any operations. TFI provides environmental services, including used oil recycling, used oil filter recycling, antifreeze products, parts washers and solvent recycling, and industrial waste management services, including vacuum services, remediation, lab pack and hazardous waste management. The Company acquired TFI for an estimated preliminary purchase price of $77.1 million inclusive of current estimates of and subject to certain closing and post-closing adjustments relating to working capital and other assumed liabilities. The acquisition was financed with cash on hand and expands the Company’s environmental services customer base while also complimenting the SK Environmental Services network and presence in the western United States. The amount of revenue from TFI included in the Company's results of operations for the three and nine months ended September 30, 2015 was $13.1 million and $24.8 million . During the three and nine months ended September 30, 2015, the Company incurred acquisition-related costs of approximately $0.1 million and $0.5 million , respectively, in connection with the transaction which are primarily included in selling, general and administrative expenses in the consolidated statements of income. Results of TFI since acquisition have been included within the SK Environmental Services segment. The allocation of the purchase price was based on preliminary estimates of the fair value of assets acquired and liabilities assumed as of April 11, 2015, as the Company is continuing to obtain information to complete its valuation of these accounts and the associated tax accounting. The components and preliminary allocation of the purchase price consist of the following amounts (in thousands): At acquisition date April 11, 2015 Measurement Period Adjustments At acquisition date as reported at September 30, 2015 Accounts receivable 7,109 $ (444 ) $ 6,665 Inventories and supplies 1,791 — 1,791 Prepaid and other current assets 1,749 8 1,757 Property, plant and equipment 30,468 (1,606 ) 28,862 Permits and other intangibles 20,000 (1,500 ) 18,500 Current liabilities (5,859 ) — (5,859 ) Closure and post-closure liabilities (1,676 ) — (1,676 ) Deferred taxes, unrecognized tax benefits and other long-term liabilities (13,081 ) 1,832 (11,249 ) Total identifiable net assets 40,501 (1,710 ) 38,791 Goodwill 36,591 1,710 38,301 Total $ 77,092 $ — $ 77,092 Pro forma revenue and earnings amounts on a combined basis as if TFI had been acquired on January 1, 2014 are immaterial to the consolidated financial statements of the Company since that date.

INVENTORIES AND SUPPLIES

INVENTORIES AND SUPPLIES	9 Months Ended
INVENTORIES AND SUPPLIES	Sep. 30, 2015
Inventory Disclosure [Abstract]
INVENTORIES AND SUPPLIES	INVENTORIES AND SUPPLIES Inventories and supplies consisted of the following (in thousands): September 30, 2015 December 31, 2014 Oil and oil products $ 35,484 $ 62,111 Supplies and drums 75,357 68,547 Solvent and solutions 9,742 9,355 Modular camp accommodations 14,738 15,776 Other 14,934 12,874 Total inventories and supplies $ 150,255 $ 168,663 As of September 30, 2015 and December 31, 2014 , other inventories consisted primarily of cleaning fluids, such as absorbents and wipers, and automotive fluids, such as windshield washer fluid and antifreeze.

PROPERTY, PLANT AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT	9 Months Ended
PROPERTY, PLANT AND EQUIPMENT	Sep. 30, 2015
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT AND EQUIPMENT	PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment consisted of the following (in thousands): September 30, 2015 December 31, 2014 Land $ 100,811 $ 98,507 Asset retirement costs (non-landfill) 12,455 10,871 Landfill assets 126,904 110,984 Buildings and improvements 338,791 338,242 Camp equipment 155,363 180,575 Vehicles 495,270 471,615 Equipment 1,312,699 1,302,424 Furniture and fixtures 5,330 5,517 Construction in progress 103,484 45,605 2,651,107 2,564,340 Less - accumulated depreciation and amortization 1,119,559 1,005,506 Total property, plant and equipment, net $ 1,531,548 $ 1,558,834 Interest in the amount of $0.6 million and $1.2 million was capitalized to fixed assets during the three and nine months ended September 30, 2015 , respectively. Interest in the amount of $0.1 million and $0.4 million was capitalized to fixed assets during the three and nine months ended September 30, 2014 , respectively. Depreciation expense, inclusive of landfill amortization was $59.2 million and $175.5 million for the three and nine months ended September 30, 2015 , respectively. Depreciation expense, inclusive of landfill amortization was $60.9 million and $178.0 million for the three and nine months ended September 30, 2014 , respectively.

GOODWILL AND OTHER INTANGIBLE A

GOODWILL AND OTHER INTANGIBLE ASSETS	9 Months Ended
GOODWILL AND OTHER INTANGIBLE ASSETS	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND OTHER INTANGIBLE ASSETS	GOODWILL AND OTHER INTANGIBLE ASSETS The changes to goodwill for the nine months ended September 30, 2015 were as follows (in thousands): 2015 Balance at January 1, 2015 $ 452,669 Acquired from TFI acquisition 38,301 Measurement period adjustment from prior acquisitions 3,841 Goodwill impairment charge (31,992 ) Foreign currency translation (14,901 ) Balance at September 30, 2015 $ 447,918 The Company assesses goodwill for impairment on an annual basis as of December 31, or at an interim date when events or changes in the business environment would more likely than not reduce the fair value of a reporting unit below its carrying value. The Company conducted the annual impairment test of goodwill for all reporting units as of December 31, 2014 and determined that no adjustment to the carrying value of goodwill for any reporting unit was necessary because the fair value of each of the reporting units exceeded that reporting unit's respective carrying value. As disclosed in the Company's annual report on Form 10-K for the year ended December 31, 2014 , the fair value of the Oil and Gas Field Services reporting unit did not significantly exceed its carrying amount. During the second quarter of 2015, certain events and changes in circumstances arose which led management of the Company to conclude that the fair value of the Oil and Gas Field Services reporting unit may be less than its carrying value and therefore an interim impairment test was conducted relative to goodwill recorded by the Oil and Gas Field Services reporting unit. The primary events and changes in circumstances which led to this conclusion were: • The second quarter is the period of time where greater levels of communication with customers and the receipt of bids and proposals for project work take place and provide management with more clarity into levels of activity and other economic and business indicators for the latter half of the fiscal year and on into the first quarter of the following year. During the quarter ended June 30, 2015, it became apparent that oil and gas exploration and production activity would continue to be lower than historical periods and lower than previously anticipated by the Company. This was evidenced by reduced volume in bid and proposal requests from customers and communications indicating the reduction in customer budgets in these areas as well as lower than anticipated pricing for our services. • Market and industry reports which management looks to in projecting business conditions and establishing forecast information evidenced more pessimistic views in the near term. The continued depressed price of oil without any upward momentum since December 2014, as well as declining and expected continued decline in rig count for the remainder of 2015, have resulted in lower estimates of industry activity in the second half of 2015 and early 2016. • In recognition of lower than anticipated business results and less optimistic market indicators, management significantly lowered its 2015 forecasts relative to the Oil and Gas Field Services reporting unit. In performing Step I of this interim goodwill impairment test, the estimated fair value of the Oil and Gas Field Services reporting unit was determined using an income approach based upon discounted cash flows and was compared to the reporting unit's carrying value as of June 30, 2015. Based on the results of that valuation, the carrying amount of the reporting unit, including $32.0 million of goodwill, exceeded its estimated fair value and as a result the Company performed Step II of the goodwill impairment test to determine the amount of goodwill impairment charge to be recorded. Step II of the goodwill impairment test required the Company to perform a theoretical purchase price allocation for the reporting unit to determine the implied fair value of goodwill and to compare the implied fair value of goodwill to the recorded amount. The estimates of the fair values of intangible assets identified in performing this theoretical purchase price allocation and resulting implied fair value of goodwill required significant judgment. Based on the results of this goodwill impairment test the implied value of goodwill was $0 and as such the Company recognized a goodwill impairment charge equal to the recorded amount of goodwill or $32.0 million as of June 30, 2015. The factors contributing to the $32.0 million goodwill impairment charge principally related to events and changes in circumstances discussed above which had negative impacts on the Company’s prospective financial information utilized in its discounted cash flow model prepared in connection with the interim impairment test. The currently projected lower levels of activity and pricing in the latter half of the year which became evident during the second quarter decreased the reporting unit’s anticipated future cash flows for 2015 as compared to those estimated previously. These factors have also provided evidence of a longer than expected overall recovery from current industry lows which negatively impacted the estimated levels of cash flows in future periods that are assumed in the cash flow models utilized in the interim impairment test. These factors adversely affected the estimated fair value of the reporting unit as of June 30, 2015 and ultimately led to the recognition of the goodwill impairment charge. As disclosed in the Company's annual report on Form 10-K for the year ended December 31, 2014, during the third quarter of 2014 the Company recorded a goodwill impairment charge of $123.4 million related to goodwill associated with the Kleen Performance Products segment. This impairment charge resulted from decreases in market prices of oil products sold by the Kleen Performance Products business which took place during the third quarter of 2014. Significant judgments and unobservable inputs categorized as Level III in the fair value hierarchy are inherent in the impairment tests performed and include assumptions about the amount and timing of expected future cash flows, growth rates, and the determination of appropriate discount rates. The Company believes that the assumptions used in its annual and any interim date impairment tests are reasonable, but variations in any of the assumptions may result in different calculations of fair values and impairment charges. The performance of the Company's reporting units will continue to be monitored. If the Company's reporting units do not achieve the financial performance that the Company expects, it is possible that additional goodwill impairment charge may result. There can therefore be no assurance that future events will not result in an impairment of goodwill. The Company continues to assess whether the Oil and Gas Field Services carrying values of finite-lived intangible and other long-lived assets are recoverable. As of September 30, 2015 the Oil and Gas Field Services reporting unit had property, plant and equipment, net of $168.6 million , other intangible assets of $17.7 million consisting of customer and supplier relationships of $9.2 million and other intangible assets of $8.5 million . Based on current analyses, sufficient undiscounted cash flows are expected to be generated over these assets' remaining lives to demonstrate these asset carrying values will be recovered and thus no impairment exists. Below is a summary of amortizable other intangible assets (in thousands): September 30, 2015 December 31, 2014 Cost Accumulated Net Weighted Cost Accumulated Net Weighted Permits $ 161,641 $ 60,091 $ 101,550 18.9 $ 156,692 $ 55,318 $ 101,374 19.0 Customer and supplier relationships 377,373 93,786 283,587 10.3 370,373 77,697 292,676 11.0 Other intangible assets 31,943 21,165 10,778 2.2 31,540 19,074 12,466 3.2 Total amortizable permits and other intangible assets 570,957 175,042 395,915 10.4 558,605 152,089 406,516 11.4 Trademarks and trade names 123,080 — 123,080 Indefinite 123,564 — 123,564 Indefinite Total permits and other intangible assets $ 694,037 $ 175,042 $ 518,995 $ 682,169 $ 152,089 $ 530,080 Amortization expense of permits and other intangible assets for the three and nine months ended September 30, 2015 and was $9.9 million and $29.7 million , respectively. Amortization expense of permits and other intangible assets for the three and nine months ended September 30, 2014 was $9.1 million and $27.5 million , respectively. Below is the expected future amortization of the net carrying amount of finite-lived intangible assets at September 30, 2015 (in thousands): Years Ending December 31, Expected Amortization 2015 (three months) $ 9,466 2016 37,397 2017 34,702 2018 31,409 2019 28,248 Thereafter 254,693 $ 395,915

ACCRUED EXPENSES

ACCRUED EXPENSES	9 Months Ended
ACCRUED EXPENSES	Sep. 30, 2015
Payables and Accruals [Abstract]
ACCRUED EXPENSES	ACCRUED EXPENSES Accrued expenses consisted of the following (in thousands): September 30, 2015 December 31, 2014 Insurance $ 55,114 $ 58,931 Interest 17,623 20,527 Accrued compensation and benefits 49,083 59,006 Income, real estate, sales and other taxes 77,837 38,297 Other 45,133 42,788 Total accrued expenses $ 244,790 $ 219,549

CLOSURE AND POST-CLOSURE LIABIL

CLOSURE AND POST-CLOSURE LIABILITIES	9 Months Ended
CLOSURE AND POST-CLOSURE LIABILITIES	Sep. 30, 2015
Asset Retirement Obligation Disclosure [Abstract]
CLOSURE AND POST-CLOSURE LIABILITIES	CLOSURE AND POST-CLOSURE LIABILITIES The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) for the nine months ended September 30, 2015 were as follows (in thousands): Landfill Non-Landfill Total Balance at January 1, 2015 $ 29,932 $ 20,769 $ 50,701 Liabilities assumed in acquisitions — 1,676 1,676 New asset retirement obligations 2,325 — 2,325 Accretion 1,887 1,567 3,454 Changes in estimates recorded to statement of income 13 — 13 Changes in estimates recorded to balance sheet 1,370 — 1,370 Expenditures (5,490 ) (259 ) (5,749 ) Currency translation and other (323 ) (203 ) (526 ) Balance at September 30, 2015 $ 29,714 $ 23,550 $ 53,264 All of the landfill facilities included in the above were active as of September 30, 2015 . New asset retirement obligations incurred during the first nine months of 2015 were discounted at the credit-adjusted risk-free rate of 5.99% . There were no significant charges (benefits) in 2015 resulting from changes in estimates for closure and post-closure liabilities.

REMEDIAL LIABILITIES

REMEDIAL LIABILITIES	9 Months Ended
REMEDIAL LIABILITIES	Sep. 30, 2015
Environmental Remediation Obligations [Abstract]
REMEDIAL LIABILITIES	REMEDIAL LIABILITIES The changes to remedial liabilities for the nine months ended September 30, 2015 were as follows (in thousands): Remedial Liabilities for Landfill Sites Remedial Liabilities for Inactive Sites Remedial Liabilities (Including Superfund) for Non-Landfill Operations Total Balance at January 1, 2015 $ 5,420 $ 68,528 $ 81,173 $ 155,121 Accretion 187 2,185 1,969 4,341 Changes in estimates recorded to statement of income (2,547 ) (250 ) 584 (2,213 ) Expenditures (110 ) (3,283 ) (7,631 ) (11,024 ) Currency translation and other (335 ) (99 ) (2,476 ) (2,910 ) Balance at September 30, 2015 $ 2,615 $ 67,081 $ 73,619 $ 143,315 During the nine months ended September 30, 2015 , the Company reduced its remedial liabilities for landfill sites by $2.5 million due to a change in estimate of the related liability. This change in estimate was triggered primarily as a result of the Company's receiving Provincial approval for a planned expansion of one its landfills in Canada. The planned expansion project will remediate the Company's previously recognized corrective actions.

FINANCING ARRANGEMENTS

FINANCING ARRANGEMENTS	9 Months Ended
FINANCING ARRANGEMENTS	Sep. 30, 2015
Debt Disclosure [Abstract]
FINANCING ARRANGEMENTS	FINANCING ARRANGEMENTS The following table is a summary of the Company’s financing arrangements (in thousands): September 30, 2015 December 31, 2014 Senior unsecured notes, at 5.25%, due August 1, 2020 ("2020 Notes") $ 800,000 $ 800,000 Senior unsecured notes, at 5.125%, due June 1, 2021 ("2021 Notes") 595,000 595,000 Long-term obligations $ 1,395,000 $ 1,395,000 At September 30, 2015 and December 31, 2014 , the fair value of the Company's 2020 Notes was $812.0 million and $804.0 million , respectively, based on quoted market prices for the instrument. The fair value of the 2020 Notes is considered a Level 2 measure according to the fair value hierarchy. At September 30, 2015 and December 31, 2014 , the fair value of the Company's 2021 Notes was $602.4 million and $595.0 million , respectively, based on quoted market prices for the instrument. The fair value of the 2021 Notes is considered a Level 2 measure according to the fair value hierarchy. The Company also maintains a revolving credit facility which as of September 30, 2015 and December 31, 2014 had no outstanding loan balances. At September 30, 2015 , $232.0 million was available to borrow and outstanding letters of credit were $144.3 million . At December 31, 2014 , $238.4 million was available to borrow and outstanding letters of credit were $134.5 million . Available credit for Clean Harbors, Inc. ("Parent") and its domestic subsidiaries is limited to 85% of their eligible accounts receivable and 100% of their cash deposited in a controlled account with the agent. The revolving credit facility is guaranteed by all of Parent’s domestic subsidiaries and secured by substantially all of Parent’s and its domestic subsidiaries’ assets. Available credit for Parent’s Canadian subsidiaries is limited to 85% of their eligible accounts receivable and 100% of their cash deposited in a controlled account with the agent’s Canadian affiliate. The obligations of the Canadian subsidiaries under the revolving credit facility are guaranteed by all of Parent’s Canadian subsidiaries and secured by the accounts receivable of the Canadian subsidiaries, but the Canadian subsidiaries do not guarantee and are not otherwise responsible for the obligations of Parent or its domestic subsidiaries.

EARNINGS (LOSS) PER SHARE

EARNINGS (LOSS) PER SHARE	9 Months Ended
EARNINGS (LOSS) PER SHARE	Sep. 30, 2015
Earnings Per Share [Abstract]
EARNINGS (LOSS) PER SHARE	EARNINGS (LOSS) PER SHARE The following are computations of basic and diluted earnings (loss) per share (in thousands except for per share amounts): Three Months Ended Nine Months Ended September 30, September 30, 2015 2014 2015 2014 Numerator for basic and diluted earnings per share: Net income (loss) $ 40,228 $ (93,337 ) $ 43,534 $ (55,705 ) Denominator: Basic shares outstanding 58,161 60,369 58,799 60,585 Dilutive effect of equity-based compensation awards 107 — 99 — Dilutive shares outstanding 58,268 60,369 58,898 60,585 Basic earnings (loss) per share: $ 0.69 $ (1.55 ) $ 0.74 $ (0.92 ) Diluted earnings (loss) per share: $ 0.69 $ (1.55 ) $ 0.74 $ (0.92 ) For the three and nine months ended September 30, 2015 , the dilutive effect of all then outstanding stock options, restricted stock awards and performance awards is included in the EPS calculations above except for 274,257 of outstanding performance stock awards for which the performance criteria were not attained at that time and 10,704 and 42,642 , respectively, restricted stock awards which were excluded from the calculation of diluted earnings per share as their inclusion would have an antidilutive effect. As a result of the net loss reported in the three and nine months ended September 30, 2014 , all outstanding restricted stock awards and performance awards totaling 624,145 instruments were excluded from the calculation of diluted earnings per share as their inclusion would have an antidilutive effect.

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE LOSS	9 Months Ended
ACCUMULATED OTHER COMPREHENSIVE LOSS	Sep. 30, 2015
Equity [Abstract]
ACCUMULATED OTHER COMPREHENSIVE LOSS	ACCUMULATED OTHER COMPREHENSIVE LOSS The changes in accumulated other comprehensive loss by component and related tax effects for the nine months ended September 30, 2015 were as follows (in thousands): Foreign Currency Translation Unfunded Pension Liability Total Balance at January 1, 2015 $ (108,889 ) $ (1,953 ) $ (110,842 ) Other comprehensive loss before reclassifications (118,713 ) — (118,713 ) Tax effects — — — Other comprehensive loss $ (118,713 ) $ — $ (118,713 ) Balance at September 30, 2015 $ (227,602 ) $ (1,953 ) $ (229,555 ) The amounts reclassified out of accumulated other comprehensive loss into the consolidated statement of income (loss), with presentation location during the three and nine months ended September 30, 2014 , were as follows (in thousands): For the Three Months Ended For the Nine Months Ended Comprehensive Loss Components September 30, 2014 September 30, 2014 Location Unrealized gains on available-for-sale investments $ 27 $ 3,388 Other (expense) income There were no reclassifications out of accumulated other comprehensive loss into the consolidated statement of income during the three and nine months ended September 30, 2015 .

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION	9 Months Ended
STOCK-BASED COMPENSATION	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK-BASED COMPENSATION	STOCK-BASED COMPENSATION Total stock-based compensation cost charged to selling, general and administrative expenses for the three and nine months ended September 30, 2015 was $0.5 million and $6.6 million , respectively. During the three months ended September 30, 2015 , the Company reversed $1.4 million of stock based compensation for performance stock awards originally issued in 2014 as management determined it was no longer probable that a portion of the performance targets would be earned. As a result, the Company has recorded $0.9 million of stock based compensation associated with these performance awards in the nine months ended September 30, 2015 . Total stock-based compensation cost charged to selling, general and administrative expenses for the three and nine months ended September 30, 2014 was $2.1 million and $6.4 million , respectively. The total income tax benefit recognized in the consolidated statements of income from stock-based compensation was $0.1 million and $1.8 million for the three and nine months ended September 30, 2015 , respectively. The total income tax benefit recognized in the consolidated statements of income from stock-based compensation was $0.5 million and $1.5 million for the three and nine months ended September 30, 2014 , respectively. Restricted Stock Awards The following information relates to restricted stock awards that have been granted to employees and directors under the Company's Plans. The restricted stock awards are not transferable until vested and the restrictions generally lapse upon the achievement of continued employment over a three -to- five -year period or service as a director until the following annual meeting of shareholders. The fair value of each restricted stock grant is based on the closing price of the Company's common stock on the date of grant and is amortized to expense over its vesting period. The following table summarizes information about restricted stock awards for the nine months ended September 30, 2015 : Restricted Stock Number of Shares Weighted Average Grant-Date Fair Value Unvested January 1, 2015 383,021 $ 56.51 Granted 142,434 $ 55.00 Vested (124,822 ) $ 55.85 Forfeited (37,972 ) $ 56.48 Unvested September 30, 2015 362,661 $ 56.15 As of September 30, 2015 , there was $13.2 million of total unrecognized compensation cost arising from restricted stock awards under the Company's Plans. This cost is expected to be recognized over a weighted average period of 3.2 years. The total fair value of restricted stock vested during the three and nine months ended September 30, 2015 was $0.6 million and $6.8 million , respectively. The total fair value of restricted stock vested during the three and nine months ended September 30, 2014 was $1.5 million and $9.1 million , respectively. Performance Stock Awards The following information relates to performance stock awards that have been granted to employees under the Company's Plans. Performance stock awards are subject to performance criteria established by the compensation committee of the Company's board of directors prior to or at the date of grant. The vesting of the performance stock awards is based on achieving such targets typically based on revenue, Adjusted EBITDA margin, ROIC percentage and Total Recordable Incident Rate. In addition performance stock awards include continued service conditions. The fair value of each performance stock award is based on the closing price of the Company's common stock on the date of grant and is amortized to expense over the service period if achievement of performance measures is considered probable. The following table summarizes information about performance stock awards for the nine months ended September 30, 2015 : Performance Stock Number of Shares Weighted Average Grant-Date Fair Value Unvested January 1, 2015 143,875 $ 60.94 Granted 167,906 $ 56.41 Vested (6,129 ) $ 54.28 Forfeited (20,049 ) $ 59.39 Unvested September 30, 2015 285,603 $ 58.53 As of September 30, 2015 , there was $0.9 million of total unrecognized compensation cost arising from unvested performance stock awards deemed probable of vesting under the Company's Plans. The total fair value of performance awards vested during the nine months ended September 30, 2015 was $0.3 million . No performance awards vested during the three months ended September 30, 2015 and the three and nine months ended September 30, 2014 . Common Stock Repurchases On March 13, 2015, the Company's board of directors increased the size of the Company’s current share repurchase program from $150 million to $300 million . During the three and nine months ended September 30, 2015 , the Company repurchased a total of 0.8 million shares and 1.3 million shares, respectively, of the Company's common stock for a total of $37.6 million and $69.8 million , respectively. During the three and nine months ended September 30, 2014 , the Company repurchased a total of 0.6 million shares and 0.9 million shares, respectively, of the Company's common stock for a total of $37.6 million and $53.8 million , respectively. As of September 30, 2015 , the Company had repurchased and retired a total of approximately 3.3 million shares of the Company's common stock for approximately $174.2 million under this program. As of September 30, 2015 , an additional $125.8 million remains available for repurchase of shares under the current authorized program.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	9 Months Ended
COMMITMENTS AND CONTINGENCIES	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Legal and Administrative Proceedings The Company and its subsidiaries are subject to legal proceedings and claims arising in the ordinary course of business. Actions filed against the Company arise from commercial and employment-related claims including alleged class actions related to sales practices and wage and hour claims. The plaintiffs in these actions may be seeking damages or injunctive relief or both. These actions are in various jurisdictions and stages of proceedings, and some are covered in part by insurance. In addition, the Company’s waste management services operations are regulated by federal, state, provincial and local laws enacted to regulate discharge of materials into the environment, remediation of contaminated soil and groundwater or otherwise protect the environment. This ongoing regulation results in the Company frequently becoming a party to legal or administrative proceedings involving all levels of governmental authorities and other interested parties. The issues involved in such proceedings generally relate to alleged violations of existing permits and licenses or alleged responsibility under federal or state Superfund laws to remediate contamination at properties owned either by the Company or by other parties (“third party sites”) to which either the Company or the prior owners of certain of the Company’s facilities shipped wastes. At September 30, 2015 and December 31, 2014 , the Company had recorded reserves of $30.0 million and $33.6 million , respectively, in the Company's financial statements for actual or probable liabilities related to the legal and administrative proceedings in which the Company was then involved, the principal of which are described below. At September 30, 2015 and December 31, 2014 , the Company also believed that it was reasonably possible that the amount of these potential liabilities could be as much as $2.4 million and $2.9 million more, respectively. The Company periodically adjusts the aggregate amount of these reserves when actual or probable liabilities are paid or otherwise discharged, new claims arise, or additional relevant information about existing or probable claims becomes available. As of September 30, 2015 and December 31, 2014 , the $30.0 million and $33.6 million , respectively, of reserves consisted of (i) $23.4 million and $27.7 million related to pending legal or administrative proceedings, including Superfund liabilities, which were included in remedial liabilities on the consolidated balance sheets, and (ii) $6.6 million and $5.9 million , respectively, primarily related to federal, state and provincial enforcement actions, which were included in accrued expenses on the consolidated balance sheets. As of September 30, 2015 , the principal legal and administrative proceedings in which the Company was involved, or which had been terminated during 2015 , were as follows: Ville Mercier. In September 2002, the Company acquired the stock of a subsidiary (the "Mercier Subsidiary") which owns a hazardous waste incinerator in Ville Mercier, Quebec (the "Mercier Facility"). The property adjacent to the Mercier Facility, which is also owned by the Mercier Subsidiary, is now contaminated as a result of actions dating back to 1968, when the Government of Quebec issued to a company unrelated to the Mercier Subsidiary two permits to dump organic liquids into lagoons on the property. In 1999, Ville Mercier and three neighboring municipalities filed separate legal proceedings against the Mercier Subsidiary and the Government of Quebec. In 2012, the municipalities amended their existing statement of claim to seek $2.9 million (Cdn) in general damages and $10.0 million (Cdn) in punitive damages, plus interest and costs, as well as injunctive relief. Both the Government of Quebec and the Company have filed summary judgment motions against the municipalities. The parties are currently attempting to negotiate a resolution and hearings on the motions have been delayed. In September 2007, the Quebec Minister of Sustainable Development, Environment and Parks issued a Notice pursuant to Section 115.1 of the Environment Quality Act, superseding Notices issued in 1992, which are the subject of the pending litigation. The more recent Notice notifies the Mercier Subsidiary that, if the Mercier Subsidiary does not take certain remedial measures at the site, the Minister intends to undertake those measures at the site and claim direct and indirect costs related to such measures. The Mercier Subsidiary continues to assert that it has no responsibility for the groundwater contamination in the region and will contest any action by the Ministry to impose costs for remedial measures on the Mercier Subsidiary. The Company also continues to pursue settlement options. At September 30, 2015 and December 31, 2014 , the Company had accrued $11.2 million and $12.7 million , respectively, for remedial liabilities relating to the Ville Mercier legal proceedings. The decrease was due to a weakening of the Canadian dollar. Refinery Incident. In September 2014, a customer filed suit against the Company and two other contractors and their respective insurers seeking to be named as an additional insured on the Company’s and the other contractors’ liability policies for an April 2013 industrial fire that occurred at the customer’s refining facility. The Company and its insurers have resolved the dispute relating to the customer’s additional insured status and the customer has agreed to indemnify the Company from any additional losses relating to the matter. The Company does not believe that this matter will have a material effect on its financial position or the results of operations. Safety-Kleen Legal Proceedings. On December 28, 2012, the Company acquired Safety-Kleen, Inc. and thereby became subject to the legal proceedings in which Safety-Kleen and its subsidiaries (collectively "Safety-Kleen") were a party on that date. In addition to certain Superfund proceedings in which Safety-Kleen has been named as a potentially responsible party as described below under “Superfund Proceedings,” the principal such legal proceedings involving Safety-Kleen which were outstanding as of September 30, 2015 were as follows: Product Liability Cases. Safety-Kleen is named as a defendant in various lawsuits that are currently pending in various courts and jurisdictions throughout the United States, including approximately 54 proceedings (excluding cases which have been settled but not formally dismissed) as of September 30, 2015 , wherein persons claim personal injury resulting from the use of Safety-Kleen's parts cleaning equipment or cleaning products. These proceedings typically involve allegations that the solvent used in Safety-Kleen's parts cleaning equipment contains contaminants and/or that Safety-Kleen's recycling process does not effectively remove the contaminants that become entrained in the solvent during their use. In addition, certain claimants assert that Safety-Kleen failed to warn adequately the product user of potential risks, including a historic failure to warn that solvent contains trace amounts of toxic or hazardous substances such as benzene. Safety-Kleen maintains insurance that it believes will provide coverage for these claims (over amounts accrued for self-insured retentions and deductibles in certain limited cases), except for punitive damages to the extent not insurable under state law or excluded from insurance coverage. Safety-Kleen believes that these claims lack merit and has historically vigorously defended, and intends to continue to vigorously defend, itself and the safety of its products against all of these claims. Such matters are subject to many uncertainties and outcomes are not predictable with assurance. Consequently, Safety-Kleen is unable to ascertain the ultimate aggregate amount of monetary liability or financial impact with respect to these matters as of September 30, 2015 . From January 1, 2015 to September 30, 2015 , 29 product liability claims were settled or dismissed. Due to the nature of these claims and the related insurance, the Company did not incur any expense as Safety-Kleen's insurance provided coverage in full for all such claims. Safety-Kleen may be named in similar, additional lawsuits in the future, including claims for which insurance coverage may not be available. Fee Class Action Claims. In October 2010, two customers filed a complaint, individually and on behalf of all similarly situated customers in the State of Alabama, alleging that Safety-Kleen improperly assessed fuel surcharges and extended area service fees. In 2012, similar lawsuits were filed by the same law firm in California and Missouri, adding a claim in the California lawsuit challenging the Company’s late fee policy. On January 15, 2015, the Company reached a tentative settlement of the pending class action lawsuits, which were broadened to include similar claims on behalf of customers in Florida, West Virginia and Arkansas. A final settlement in the amount of $0.1 million was approved by the court in a fairness hearing in June 2015. Such settlement is subject to limited appeal; however, any adjustment to the amount would not be material. Superfund Proceedings The Company has been notified that either the Company (which, since December 28, 2012, includes Safety-Kleen) or the prior owners of certain of the Company's facilities for which the Company may have certain indemnification obligations have been identified as potentially responsible parties ("PRPs") or potential PRPs in connection with 128 sites which are subject to or are proposed to become subject to proceedings under federal or state Superfund laws. Of the 128 sites, two (the Wichita Facility and the BR Facility described below) involve facilities that are now owned by the Company and 126 involve third party sites to which either the Company or the prior owners of certain of the Company’s facilities shipped wastes. Of the 126 third party sites, 29 are now settled, 22 are currently requiring expenditures on remediation and 75 are not currently requiring expenditures on remediation. In connection with each site, the Company has estimated the extent, if any, to which it may be subject, either directly or as a result of any indemnification obligations, for cleanup and remediation costs, related legal and consulting costs associated with PRP investigations, settlements, and related legal and administrative proceedings. The amount of such actual and potential liability is inherently difficult to estimate because of, among other relevant factors, uncertainties as to the legal liability (if any) of the Company or the prior owners of certain of the Company's facilities to contribute a portion of the cleanup costs, the assumptions that must be made in calculating the estimated cost and timing of remediation, the identification of other PRPs and their respective capability and obligation to contribute to remediation efforts, and the existence and legal standing of indemnification agreements (if any) with prior owners, which may either benefit the Company or subject the Company to potential indemnification obligations. In addition to the Wichita Property and the BR Facility described below, Clean Harbors believes its potential liability could exceed $100,000 at 12 of the 126 third party sites. Wichita Property. The Company acquired in 2002 a service center located in Wichita, Kansas (the "Wichita Property"). The Wichita Property is one of several properties located within the boundaries of a 1,400 acre state-designated Superfund site in an old industrial section of Wichita known as the North Industrial Corridor Site. Along with numerous other PRPs, the former owner executed a consent decree relating to such site with the U.S. Environmental Protection Agency (the "EPA"), and the Company is continuing an ongoing remediation program for the Wichita Property in accordance with that consent decree. The Company also acquired rights under an indemnification agreement between the former owner and an earlier owner of the Wichita Property. The Company filed suit against the earlier owner in July of 2015 to recover costs incurred during the cleanup of the property. BR Facility. The Company acquired in 2002 a former hazardous waste incinerator and landfill in Baton Rouge (the "BR Facility"), for which operations had been previously discontinued by the prior owner. In September 2007, the EPA issued a special notice letter to the Company related to the Devil's Swamp Lake Site ("Devil's Swamp") in East Baton Rouge Parish, Louisiana. Devil's Swamp includes a lake located downstream of an outfall ditch where wastewater and stormwater have been discharged, and Devil's Swamp is proposed to be included on the National Priorities List due to the presence of Contaminants of Concern ("COC") cited by the EPA. These COCs include substances of the kind found in wastewater and storm water discharged from the BR Facility in past operations. The EPA originally requested COC generators to submit a good faith offer to conduct a remedial investigation feasibility study directed towards the eventual remediation of the site. The Company is currently performing corrective actions at the BR Facility under an order issued by the Louisiana Department of Environmental Quality, and has begun conducting the remedial investigation and feasibility study under an order issued by the EPA. The Company cannot presently estimate the potential additional liability for the Devil's Swamp cleanup until a final remedy is selected by the EPA. Third Party Sites. Of the 126 third party sites at which the Company has been notified it is a PRP or potential PRP or may have indemnification obligations, Clean Harbors has an indemnification agreement at 11 of these sites with ChemWaste, a former subsidiary of Waste Management, Inc., and at six additional of these third party sites, Safety-Kleen has a similar indemnification agreement with McKesson Corporation. These agreements indemnify the Company (which now includes Safety-Kleen) with respect to any liability at the 17 sites for waste disposed prior to the Company's (or Safety-Kleen's) acquisition of the former subsidiaries of Waste Management or McKesson which had shipped wastes to those sites. Accordingly, Waste Management or McKesson are paying all costs of defending those subsidiaries in those 17 cases, including legal fees and settlement costs. However, there can be no guarantee that the Company's ultimate liabilities for those sites will not exceed the amount recorded or that indemnities applicable to any of these sites will be available to pay all or a portion of related costs. Except for the indemnification agreements which the Company holds from ChemWaste and McKesson, the Company does not have an indemnity agreement with respect to any of the 126 third party sites discussed above. Federal, State and Provincial Enforcement Actions From time to time, the Company pays fines or penalties in regulatory proceedings relating primarily to waste treatment, storage or disposal facilities. As of September 30, 2015 and December 31, 2014 , there were five and four , respectively, proceedings for which the Company reasonably believed that the sanctions could equal or exceed $100,000 . The Company believes that the fines or other penalties in these or any of the other regulatory proceedings will, individually and in the aggregate, not have a material effect on its financial condition, results of operations or cash flows.

INCOME TAXES INCOME TAXES

INCOME TAXES INCOME TAXES	9 Months Ended
INCOME TAXES INCOME TAXES	Sep. 30, 2015
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES Effective tax rates for the three and nine months ended September 30, 2015 were 46.2% and 58.1% . The Company did not record any tax charges or benefits as a result of the goodwill impairment charge recorded in the second quarter of 2015. Absent the impact of the impairment charge on pre-tax income from operations, the Company’s effective tax rate for the nine months ended September 30, 2015 was 44.4% . As a result of the goodwill impairment charge recorded in the third quarter of 2014, the Company recorded an income tax benefit of $2.7 million . Absent the impact of the impairment charge on pre-tax income from operations the Company’s effective tax rate for the three and nine months ended September 30, 2014 was 55.6% and 47.3% . The decrease in the effective rates absent the impact of impairment charges for the three and nine months ended September 30, 2015 was primarily due to discrete items recorded in the third quarter of 2014 which did not reoccur in 2015. As of September 30, 2015 and December 31, 2014 , the Company had recorded $2.2 million and $2.5 million , respectively, of liabilities for unrecognized tax benefits and $0.4 million of interest, respectively. Due to an audit settlement for one of our foreign entities, the Company believes that total unrecognized tax benefits will decrease by approximately $0.5 million within the next 12 months.

SEGMENT REPORTING

SEGMENT REPORTING	9 Months Ended
SEGMENT REPORTING	Sep. 30, 2015
Segment Reporting [Abstract]
SEGMENT REPORTING	SEGMENT REPORTING Segment reporting is prepared on the same basis that the Company's chief executive officer, who is the Company's chief operating decision maker, manages the business, makes operating decisions and assesses performance. Third party revenue is revenue billed to outside customers by a particular segment. Direct revenue is revenue allocated to the segment performing the provided service. Intersegment revenues represent the sharing of third party revenues among the segments based on products and services provided by each segment as if the products and services were sold directly to the third party. The intersegment revenues are shown net. The negative intersegment revenues are due to more transfers out of customer revenues to other segments than transfers in of customer revenues from other segments. The operations not managed through the Company’s six reportable segments are recorded as “Corporate Items.” Corporate Items revenues consist of two different operations for which the revenues are insignificant. Corporate Items cost of revenues represents certain central services that are not allocated to the six segments for internal reporting purposes. Corporate Items selling, general and administrative expenses include typical corporate items such as legal, accounting and other items of a general corporate nature that are not allocated to the Company’s six reportable segments. Performance of the segments is evaluated on several factors, of which the primary financial measure is “Adjusted EBITDA,” which consists of net income (loss) plus accretion of environmental liabilities, depreciation and amortization, net interest expense, provision for income taxes, other non-cash charges not deemed representative of fundamental segment results and excludes other (expense) income. Transactions between the segments are accounted for at the Company’s best estimate based on similar transactions with outside customers. The following table reconciles third party revenues to direct revenues for the three and nine months ended September 30, 2015 and 2014 (in thousands): For the Three Months Ended September 30, 2015 For the Three Months Ended September 30, 2014 Third party revenues Intersegment revenues, net Corporate Items, net Direct revenues Third party revenues Intersegment revenues, net Corporate Items, net Direct revenues Technical Services $ 253,069 $ 34,819 $ 506 $ 288,394 $ 272,478 $ 39,296 $ 1,628 $ 313,402 Industrial and Field Services 307,226 (6,973 ) (313 ) 299,940 163,582 (9,234 ) 29 154,377 Kleen Performance Products 100,827 (23,744 ) (6 ) 77,077 140,345 (52,606 ) — 87,739 SK Environmental Services 171,832 (5,947 ) 2 165,887 170,980 21,212 — 192,192 Lodging Services 13,507 743 30 14,280 36,582 697 26 37,305 Oil and Gas Field Services 46,788 1,102 92 47,982 67,370 635 4 68,009 Corporate Items 117 — (311 ) (194 ) 128 — (1,687 ) (1,559 ) Total $ 893,366 $ — $ — $ 893,366 $ 851,465 $ — $ — $ 851,465 For the Nine Months Ended September 30, 2015 For the Nine Months Ended September 30, 2014 Third party revenues Intersegment revenues, net Corporate Items, net Direct revenues Third party revenues Intersegment revenues, net Corporate Items, net Direct revenues Technical Services $ 741,419 $ 108,037 $ 2,886 $ 852,342 $ 766,057 $ 116,812 $ 2,805 $ 885,674 Industrial and Field Services 807,423 (24,764 ) (636 ) 782,023 510,696 (32,039 ) 220 478,877 Kleen Performance Products 296,738 (63,429 ) (8 ) 233,301 413,282 (155,583 ) (5 ) 257,694 SK Environmental Services 508,392 (26,331 ) 5 482,066 503,692 64,476 (58 ) 568,110 Lodging Services 68,782 1,899 127 70,808 136,148 1,991 52 138,191 Oil and Gas Field Services 138,992 4,588 141 143,721 226,319 4,343 (6 ) 230,656 Corporate Items 347 — (2,515 ) (2,168 ) 418 — (3,008 ) (2,590 ) Total $ 2,562,093 $ — $ — $ 2,562,093 $ 2,556,612 $ — $ — $ 2,556,612 The following table presents Adjusted EBITDA information used by management for each reportable segment (in thousands). The Company does not allocate interest expense, income taxes, depreciation, amortization, accretion of environmental liabilities, other non-cash charges not deemed representative of fundamental segment results, and other expense (income) to its segments. For the Three Months Ended For the Nine Months Ended September 30, September 30, 2015 2014 2015 2014 Adjusted EBITDA: Technical Services $ 79,048 $ 86,928 $ 219,257 $ 233,402 Industrial and Field Services 62,460 20,303 145,850 67,391 Kleen Performance Products 12,123 21,473 23,471 49,252 SK Environmental Services 40,096 30,853 108,540 84,985 Lodging Services 1,827 15,972 12,589 49,196 Oil and Gas Field Services 1,579 9,545 800 27,688 Corporate Items (31,526 ) (31,717 ) (103,501 ) (120,772 ) Total $ 165,607 $ 153,357 $ 407,006 $ 391,142 Reconciliation to Consolidated Statements of Income: Accretion of environmental liabilities 2,577 2,642 7,795 7,975 Depreciation and amortization 69,060 70,049 205,189 205,480 Goodwill impairment charge — 123,414 31,992 123,414 Income (loss) from operations 93,970 (42,748 ) 162,030 54,273 Other expense (income) 139 (613 ) 390 (4,136 ) Interest expense, net of interest income 19,017 19,494 57,704 58,430 Income (loss) before provision for income taxes $ 74,814 $ (61,629 ) $ 103,936 $ (21 ) The following table presents certain assets by reportable segment and in the aggregate (in thousands): September 30, 2015 Technical Industrial and Field Kleen Performance Products SK Environmental Services Lodging Services Oil and Gas Field Corporate Totals Property, plant and equipment, net $ 464,705 $ 242,007 $ 193,576 $ 258,178 $ 112,708 $ 168,630 $ 91,744 $ 1,531,548 Goodwill 49,426 106,043 49,972 209,089 33,388 — — 447,918 Permits and other intangible, net 74,885 15,375 142,898 260,327 7,791 17,719 — 518,995 Total assets $ 806,451 $ 392,284 $ 497,627 $ 793,163 $ 187,461 $ 264,910 $ 657,965 $ 3,599,861 December 31, 2014 Technical Industrial and Field Kleen Performance Products SK Environmental Services Lodging Services Oil and Gas Field Corporate Totals Property, plant and equipment, net $ 412,323 $ 245,115 $ 201,451 $ 240,078 $ 141,965 $ 215,574 $ 102,328 $ 1,558,834 Goodwill 50,092 109,214 50,883 173,873 34,863 33,744 — 452,669 Permits and other intangible, net 74,870 17,801 151,041 252,897 10,744 22,727 — 530,080 Total assets $ 756,169 $ 392,652 $ 538,921 $ 731,072 $ 231,782 $ 361,223 $ 692,459 $ 3,704,278 The following table presents total assets by geographical area (in thousands): September 30, 2015 December 31, 2014 United States $ 2,681,409 $ 2,572,494 Canada 914,690 1,128,458 Other foreign 3,762 3,326 Total $ 3,599,861 $ 3,704,278

GUARANTOR AND NON-GUARANTOR SUB

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION	9 Months Ended
	Sep. 30, 2015
Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract]
GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION	GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION The 2020 Notes and 2021 Notes are guaranteed by substantially all of the Company's subsidiaries organized in the United States. Each guarantor for the 2020 Notes and 2021 Notes is a 100% owned subsidiary of the Company and its guarantee is both full and unconditional and joint and several. The 2020 Notes and 2021 Notes are not guaranteed by the Company’s Canadian or other foreign subsidiaries. The following presents supplemental condensed consolidating financial information for the parent company, the guarantor subsidiaries and the non-guarantor subsidiaries, respectively. Revision of Previously Reported Condensed Consolidating Information - As discussed further in the Company's 2014 Annual Report on Form 10-K, during preparation of the December 31, 2014 financial statements, management determined that certain amounts in the Company’s condensed consolidating financial information as previously presented in this Guarantor And Non-Guarantor Subsidiaries footnote for the period ended September 30, 2014 was not presented in accordance with the requirements of Rule 3-10 of SEC Regulation S-X (“Rule 3-10”). The accompanying financial information related to the period ended September 30, 2014 has therefore been revised to correct the historical presentation. The revisions primarily relate to the following items: • (Benefit) provision for income taxes - Excess provision for income taxes was allocated to Clean Harbors, Inc. and under allocated to U.S. Guarantor Subsidiaries. • Equity in earnings of subsidiaries, net of tax - interest expense resulting from transactions between the U.S. Guarantor Subsidiaries and Foreign Non-Guarantor Subsidiaries was incorrectly excluded in the application of the equity method of accounting required by Rule 3-10 resulting in an overstatement of equity in earnings of subsidiaries, net of tax, as reflected in the financial information for the U.S. Guarantor Subsidiaries. These revisions impacted the condensed consolidating information for the period ended September 30, 2014 as presented in this footnote only and did not affect any of the Company's consolidated financial statements or ratios based thereon. There was no impact to the Company's loan covenants as a result of these corrections. Following is the condensed consolidating balance sheet at September 30, 2015 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Assets: Cash and cash equivalents $ 11,008 $ 66,074 $ 102,109 $ — $ 179,191 Intercompany receivables 156,833 210,159 30,572 (397,564 ) — Accounts receivable, net — 493,459 106,824 — 600,283 Other current assets — 220,901 72,180 — 293,081 Property, plant and equipment, net — 1,056,190 475,358 — 1,531,548 Investments in subsidiaries 2,566,095 547,520 — (3,113,615 ) — Intercompany debt receivable — 285,385 3,701 (289,086 ) — Goodwill — 359,068 88,850 — 447,918 Permits and other intangibles, net — 441,639 77,356 — 518,995 Other long-term assets 14,342 9,039 5,464 — 28,845 Total assets $ 2,748,278 $ 3,689,434 $ 962,414 $ (3,800,265 ) $ 3,599,861 Liabilities and Stockholders’ Equity: Current liabilities $ 18,558 $ 523,971 $ 82,487 $ — $ 625,016 Intercompany payables 208,298 187,406 1,860 (397,564 ) — Closure, post-closure and remedial liabilities, net — 155,386 19,291 — 174,677 Long-term obligations 1,395,000 — — — 1,395,000 Intercompany debt payable 3,701 — 285,385 (289,086 ) — Other long-term liabilities — 256,576 25,871 — 282,447 Total liabilities 1,625,557 1,123,339 414,894 (686,650 ) 2,477,140 Stockholders’ equity 1,122,721 2,566,095 547,520 (3,113,615 ) 1,122,721 Total liabilities and stockholders’ equity $ 2,748,278 $ 3,689,434 $ 962,414 $ (3,800,265 ) $ 3,599,861 Following is the condensed consolidating balance sheet at December 31, 2014 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Assets: Cash and cash equivalents $ 1,006 $ 154,147 $ 91,726 $ — $ 246,879 Intercompany receivables 133,219 156,920 39,724 (329,863 ) — Accounts receivables — 414,205 142,926 — 557,131 Other current assets — 241,232 81,191 — 322,423 Property, plant and equipment, net — 970,757 588,077 — 1,558,834 Investments in subsidiaries 2,694,727 663,191 — (3,357,918 ) — Intercompany debt receivable — 327,634 3,701 (331,335 ) — Goodwill — 324,930 127,739 — 452,669 Permits and other intangibles, net — 435,906 94,174 — 530,080 Other long-term assets 16,801 12,959 6,502 — 36,262 Total assets $ 2,845,753 $ 3,701,881 $ 1,175,760 $ (4,019,116 ) $ 3,704,278 Liabilities and Stockholders’ Equity: Current liabilities $ 20,820 $ 444,059 $ 107,592 $ — $ 572,471 Intercompany payables 163,361 164,231 2,271 (329,863 ) — Closure, post-closure and remedial liabilities, net — 158,622 25,109 — 183,731 Long-term obligations 1,395,000 — — — 1,395,000 Intercompany debt payable 3,701 — 327,634 (331,335 ) — Other long-term liabilities — 240,242 49,963 — 290,205 Total liabilities 1,582,882 1,007,154 512,569 (661,198 ) 2,441,407 Stockholders’ equity 1,262,871 2,694,727 663,191 (3,357,918 ) 1,262,871 Total liabilities and stockholders’ equity $ 2,845,753 $ 3,701,881 $ 1,175,760 $ (4,019,116 ) $ 3,704,278 Following is the consolidating statement of income (loss) for the three months ended September 30, 2015 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Revenues Service revenues $ — $ 612,814 $ 162,680 $ (14,827 ) $ 760,667 Product revenues — 117,653 17,591 (2,545 ) 132,699 Total revenues — 730,467 180,271 (17,372 ) 893,366 Cost of revenues (exclusive of items shown separately below) Service cost of revenues — 413,878 124,625 (14,827 ) 523,676 Product cost of revenues — 101,778 11,737 (2,545 ) 110,970 Total cost of revenues — 515,656 136,362 (17,372 ) 634,646 Selling, general and administrative expenses 25 72,811 20,277 — 93,113 Accretion of environmental liabilities — 2,277 300 — 2,577 Depreciation and amortization — 46,951 22,109 — 69,060 Goodwill impairment charge — — — — — (Loss) income from operations (25 ) 92,772 1,223 — 93,970 Other income (expense) — 204 (343 ) — (139 ) Interest (expense) income (19,671 ) 613 41 — (19,017 ) Equity in earnings of subsidiaries, net of taxes 52,046 (2,341 ) — (49,705 ) — Intercompany interest income (expense) — 5,666 (5,666 ) — — Income (loss) before provision for income taxes 32,350 96,914 (4,745 ) (49,705 ) 74,814 (Benefit) provision for income taxes (7,878 ) 44,868 (2,404 ) — 34,586 Net income (loss) 40,228 52,046 (2,341 ) (49,705 ) 40,228 Other comprehensive loss (53,541 ) (53,541 ) (34,150 ) 87,691 (53,541 ) Comprehensive loss $ (13,313 ) $ (1,495 ) $ (36,491 ) $ 37,986 $ (13,313 ) Following is the consolidating statement of income (loss) for the three months ended September 30, 2014 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Revenues Service revenues $ — $ 420,906 $ 235,569 $ 746 $ 657,221 Product revenues — 167,492 26,713 39 194,244 Total revenues — 588,398 262,282 785 851,465 Cost of revenues (exclusive of items shown separately below) Service cost of revenues — 265,940 173,575 746 440,261 Product cost of revenues — 149,270 8,837 39 158,146 Total cost of revenues — 415,210 182,412 785 598,407 Selling, general and administrative expenses 25 71,139 28,537 — 99,701 Accretion of environmental liabilities — 2,295 347 — 2,642 Depreciation and amortization — 44,305 25,744 — 70,049 Goodwill impairment charge — 105,466 17,948 — 123,414 (Loss) income from operations (25 ) (50,017 ) 7,294 — (42,748 ) Other income (expense) — 2,592 (1,979 ) — 613 Interest (expense) income (19,622 ) 85 43 — (19,494 ) Equity in earnings of subsidiaries, net of taxes (81,549 ) (7,361 ) — 88,910 — Intercompany interest income (expense) — 6,148 (6,148 ) — — Loss before (benefit) provision for income taxes (101,196 ) (48,553 ) (790 ) 88,910 (61,629 ) (Benefit) provision for income taxes (7,859 ) 32,996 6,571 — 31,708 Net loss (93,337 ) (81,549 ) (7,361 ) 88,910 (93,337 ) Other comprehensive (loss) income (49,092 ) (49,092 ) 32,335 16,757 (49,092 ) Comprehensive (loss) income $ (142,429 ) $ (130,641 ) $ 24,974 $ 105,667 $ (142,429 ) Following is the consolidating statement of income (loss) for the nine months ended September 30, 2015 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Revenues Service revenues $ — $ 1,659,739 $ 546,790 $ (48,185 ) $ 2,158,344 Product revenues — 349,524 63,239 (9,014 ) 403,749 Total revenues — 2,009,263 610,029 (57,199 ) 2,562,093 Cost of revenues (exclusive of items shown separately below) Service cost of revenues — 1,106,591 426,530 (48,185 ) 1,484,936 Product cost of revenues — 315,322 42,597 (9,014 ) 348,905 Total cost of revenues — 1,421,913 469,127 (57,199 ) 1,833,841 Selling, general and administrative expenses 75 247,472 73,699 — 321,246 Accretion of environmental liabilities — 6,870 925 — 7,795 Depreciation and amortization — 137,354 67,835 — 205,189 Goodwill impairment charge — 4,164 27,828 — 31,992 (Loss) income from operations (75 ) 191,490 (29,385 ) — 162,030 Other income (expense) — 483 (873 ) — (390 ) Interest (expense) income (58,962 ) 1,115 143 — (57,704 ) Equity in earnings of subsidiaries, net of taxes 78,956 (38,920 ) — (40,036 ) — Intercompany interest income (expense) — 17,679 (17,679 ) — — Income (loss) before (benefit) provision for income taxes 19,919 171,847 (47,794 ) (40,036 ) 103,936 (Benefit) provision for income taxes (23,615 ) 92,891 (8,874 ) — 60,402 Net income (loss) 43,534 78,956 (38,920 ) (40,036 ) 43,534 Other comprehensive loss (118,713 ) (118,713 ) (76,752 ) 195,465 (118,713 ) Comprehensive loss $ (75,179 ) $ (39,757 ) $ (115,672 ) $ 155,429 $ (75,179 ) Following is the consolidating statement of income (loss) for the nine months ended September 30, 2014 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Revenues Service revenues $ — $ 1,325,266 $ 647,469 $ (10,664 ) $ 1,962,071 Product revenues — 475,429 122,343 (3,231 ) 594,541 Total revenues — 1,800,695 769,812 (13,895 ) 2,556,612 Cost of revenues (exclusive of items shown separately below) Service cost of revenues — 872,999 471,108 (10,664 ) 1,333,443 Product cost of revenues — 403,007 97,857 (3,231 ) 497,633 Total cost of revenues — 1,276,006 568,965 (13,895 ) 1,831,076 Selling, general and administrative expenses 82 241,317 92,995 — 334,394 Accretion of environmental liabilities — 6,931 1,044 — 7,975 Depreciation and amortization — 128,496 76,984 — 205,480 Goodwill impairment charge — 105,466 17,948 — 123,414 (Loss) income from operations (82 ) 42,479 11,876 — 54,273 Other income — 2,716 1,420 — 4,136 Interest (expense) income (58,968 ) 537 1 — (58,430 ) Equity in earnings of subsidiaries, net of taxes (20,275 ) (13,525 ) — 33,800 — Intercompany dividend income — — 6,238 (6,238 ) — Intercompany interest income (expense) — 24,368 (24,368 ) — — (Loss) income before (benefit) provision for income taxes (79,325 ) 56,575 (4,833 ) 27,562 (21 ) (Benefit) provision for income taxes (23,620 ) 76,850 2,454 — 55,684 Net loss (55,705 ) (20,275 ) (7,287 ) 27,562 (55,705 ) Other comprehensive (loss) income (54,561 ) (54,561 ) 9,090 45,471 (54,561 ) Comprehensive (loss) income $ (110,266 ) $ (74,836 ) $ 1,803 $ 73,033 $ (110,266 ) Following is the condensed consolidating statement of cash flows for the nine months ended September 30, 2015 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Net cash from operating activities $ 9,503 $ 240,713 $ 59,377 $ — $ 309,593 Cash flows used in investing activities: Additions to property, plant and equipment — (162,329 ) (27,670 ) — (189,999 ) Proceeds from sales of fixed assets — 1,177 2,563 — 3,740 Acquisitions, net of cash acquired — (79,610 ) — — (79,610 ) Costs to obtain or renew permits — (4 ) (4,629 ) — (4,633 ) Intercompany — (71,182 ) 71,182 — Net cash used in investing activities — (311,948 ) (29,736 ) 71,182 (270,502 ) Cash flows used in financing activities: Change in uncashed checks — (16,635 ) (5,247 ) — (21,882 ) Exercise of stock options 397 — — — 397 Issuance of restricted shares, net of shares remitted (2,027 ) — — — (2,027 ) Repurchases of common stock (69,155 ) — — — (69,155 ) Excess tax benefit of stock-based compensation 102 — — — 102 Payments on capital leases — (203 ) (297 ) — (500 ) Intercompany 71,182 — — (71,182 ) — Net cash used in financing activities 499 (16,838 ) (5,544 ) (71,182 ) (93,065 ) Effect of exchange rate change on cash — — (13,714 ) — (13,714 ) Increase (decrease) in cash and cash equivalents 10,002 (88,073 ) 10,383 — (67,688 ) Cash and cash equivalents, beginning of period 1,006 154,147 91,726 — 246,879 Cash and cash equivalents, end of period $ 11,008 $ 66,074 $ 102,109 $ — $ 179,191 Following is the condensed consolidating statement of cash flows for the nine months ended September 30, 2014 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Net cash (used in) from operating activities $ (5,193 ) $ 139,640 $ 80,178 $ (18,586 ) $ 196,039 Cash flows used in investing activities: Additions to property, plant and equipment — (133,320 ) (65,557 ) — (198,877 ) Proceeds from sale of fixed assets — 3,634 2,279 — 5,913 Acquisitions, net of cash acquired — (6,150 ) — — (6,150 ) Costs to obtain or renew permits — (589 ) (4,854 ) — (5,443 ) Proceeds from sale of long term investments — — 12,947 — 12,947 Intercompany — (55,997 ) — 55,997 — Other — — 914 914 Net cash used in investing activities — (192,422 ) (54,271 ) 55,997 (190,696 ) Cash flows from (used in) financing activities: Change in uncashed checks — 579 (1,170 ) — (591 ) Proceeds from employee stock purchase plan 4,364 — — — 4,364 Issuance of restricted shares, net of shares remitted (2,668 ) — — — (2,668 ) Repurchases of common stock (48,329 ) — — — (48,329 ) Excess tax benefit of stock-based compensation 829 — — — 829 Repayment of long-term obligations (5,000 ) — — — (5,000 ) Payments of capital leases — (129 ) (1,553 ) — (1,682 ) Dividends paid — (18,586 ) — 18,586 — Intercompany 55,997 — — (55,997 ) — Net cash from (used in) financing activities 5,193 (18,136 ) (2,723 ) (37,411 ) (53,077 ) Effect of exchange rate change on cash — — (4,318 ) — (4,318 ) Decrease in cash and cash equivalents — (70,918 ) 18,866 — (52,052 ) Cash and cash equivalents, beginning of period 1,006 235,445 73,622 — 310,073 Cash and cash equivalents, end of period $ 1,006 $ 164,527 $ 92,488 $ — $ 258,021

SIGNIFICANT ACCOUNTING POLICI27

SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
SIGNIFICANT ACCOUNTING POLICIES (Policies)	Sep. 30, 2015
Accounting Policies [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements Standards implemented In April 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360) . The amendments in ASU 2014-08 provide guidance for the recognition and disclosure of discontinued operations. The adoption of ASU 2014-08 did not have an impact on the Company's consolidated financial statements. Standards to be implemented In May 2014, FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) . ASU 2014-09 outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. In August 2015, FASB issued ASU 2015-14 which deferred the effective date of ASU 2014-09 for all entities by one year. This new guidance is currently effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2017. In February 2015, the FASB issued ASU 2015-02, Consolidation (Topic 810) . The amendment provides guidance regarding amendments to the consolidation analysis. The amendments in this update are currently effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2015. The Company is currently evaluating the impact that the above standards to be implemented will have on the Company's consolidated financial statements. In April 2015, FASB issued ASU 2015-03, Interest - Imputation of Interest (Subtopic 835-30). The amendment provides guidance that requires debt issuance costs related to a recognized debt liability to be presented in the balance sheet as a direct deduction from the debt liability rather than as an asset. The recognition and measurement guidance for debt issuance costs are not affected by the accounting standard update. The standard will be effective for annual periods and interim periods within those annual periods beginning after December 15, 2015, with early adoption permitted. The revised standard will be adopted by the Company on January 1, 2016, at which time it will be applied retrospectively and will require reclassifications within the Company’s consolidated balance sheets. The revised standard only affects presentation and therefore will not have an impact on the Company’s results of operations. In July 2015, FASB issued ASU 2015-11, Inventory (Topic 330) . The amendment provides guidance regarding the measurement of inventory. Entities should measure inventory within the scope of this update at the lower of cost and net realizable value. The amendments in this update are currently effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2016. Adoption is not expected to have a material impact on the Company's consolidated financial statements.

BUSINESS COMBINATIONS (Tables)

BUSINESS COMBINATIONS (Tables)	9 Months Ended
BUSINESS COMBINATIONS (Tables)	Sep. 30, 2015
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition	The components and preliminary allocation of the purchase price consist of the following amounts (in thousands): At acquisition date April 11, 2015 Measurement Period Adjustments At acquisition date as reported at September 30, 2015 Accounts receivable 7,109 $ (444 ) $ 6,665 Inventories and supplies 1,791 — 1,791 Prepaid and other current assets 1,749 8 1,757 Property, plant and equipment 30,468 (1,606 ) 28,862 Permits and other intangibles 20,000 (1,500 ) 18,500 Current liabilities (5,859 ) — (5,859 ) Closure and post-closure liabilities (1,676 ) — (1,676 ) Deferred taxes, unrecognized tax benefits and other long-term liabilities (13,081 ) 1,832 (11,249 ) Total identifiable net assets 40,501 (1,710 ) 38,791 Goodwill 36,591 1,710 38,301 Total $ 77,092 $ — $ 77,092

INVENTORIES AND SUPPLIES (Table

INVENTORIES AND SUPPLIES (Tables)	9 Months Ended
INVENTORIES AND SUPPLIES (Tables)	Sep. 30, 2015
Inventory Disclosure [Abstract]
Schedule of Inventory	Inventories and supplies consisted of the following (in thousands): September 30, 2015 December 31, 2014 Oil and oil products $ 35,484 $ 62,111 Supplies and drums 75,357 68,547 Solvent and solutions 9,742 9,355 Modular camp accommodations 14,738 15,776 Other 14,934 12,874 Total inventories and supplies $ 150,255 $ 168,663

PROPERTY, PLANT AND EQUIPMENT (

PROPERTY, PLANT AND EQUIPMENT (Tables)	9 Months Ended
PROPERTY, PLANT AND EQUIPMENT (Tables)	Sep. 30, 2015
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, plant and equipment consisted of the following (in thousands): September 30, 2015 December 31, 2014 Land $ 100,811 $ 98,507 Asset retirement costs (non-landfill) 12,455 10,871 Landfill assets 126,904 110,984 Buildings and improvements 338,791 338,242 Camp equipment 155,363 180,575 Vehicles 495,270 471,615 Equipment 1,312,699 1,302,424 Furniture and fixtures 5,330 5,517 Construction in progress 103,484 45,605 2,651,107 2,564,340 Less - accumulated depreciation and amortization 1,119,559 1,005,506 Total property, plant and equipment, net $ 1,531,548 $ 1,558,834

GOODWILL AND OTHER INTANGIBLE31

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	9 Months Ended
GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of changes to goodwill	The changes to goodwill for the nine months ended September 30, 2015 were as follows (in thousands): 2015 Balance at January 1, 2015 $ 452,669 Acquired from TFI acquisition 38,301 Measurement period adjustment from prior acquisitions 3,841 Goodwill impairment charge (31,992 ) Foreign currency translation (14,901 ) Balance at September 30, 2015 $ 447,918
Summary of amortizable other intangible assets (indefinite-lived)	Below is a summary of amortizable other intangible assets (in thousands): September 30, 2015 December 31, 2014 Cost Accumulated Net Weighted Cost Accumulated Net Weighted Permits $ 161,641 $ 60,091 $ 101,550 18.9 $ 156,692 $ 55,318 $ 101,374 19.0 Customer and supplier relationships 377,373 93,786 283,587 10.3 370,373 77,697 292,676 11.0 Other intangible assets 31,943 21,165 10,778 2.2 31,540 19,074 12,466 3.2 Total amortizable permits and other intangible assets 570,957 175,042 395,915 10.4 558,605 152,089 406,516 11.4 Trademarks and trade names 123,080 — 123,080 Indefinite 123,564 — 123,564 Indefinite Total permits and other intangible assets $ 694,037 $ 175,042 $ 518,995 $ 682,169 $ 152,089 $ 530,080
Schedule of expected amortization for the net carrying amount of finite lived intangible assets	Below is the expected future amortization of the net carrying amount of finite-lived intangible assets at September 30, 2015 (in thousands): Years Ending December 31, Expected Amortization 2015 (three months) $ 9,466 2016 37,397 2017 34,702 2018 31,409 2019 28,248 Thereafter 254,693 $ 395,915

ACCRUED EXPENSES (Tables)

ACCRUED EXPENSES (Tables)	9 Months Ended
ACCRUED EXPENSES (Tables)	Sep. 30, 2015
Payables and Accruals [Abstract]
Accrued expenses	Accrued expenses consisted of the following (in thousands): September 30, 2015 December 31, 2014 Insurance $ 55,114 $ 58,931 Interest 17,623 20,527 Accrued compensation and benefits 49,083 59,006 Income, real estate, sales and other taxes 77,837 38,297 Other 45,133 42,788 Total accrued expenses $ 244,790 $ 219,549

CLOSURE AND POST-CLOSURE LIAB33

CLOSURE AND POST-CLOSURE LIABILITIES (Tables)	9 Months Ended
CLOSURE AND POST-CLOSURE LIABILITIES (Tables)	Sep. 30, 2015
Asset Retirement Obligation Disclosure [Abstract]
Schedule of closure and post-closure liabilities	The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) for the nine months ended September 30, 2015 were as follows (in thousands): Landfill Non-Landfill Total Balance at January 1, 2015 $ 29,932 $ 20,769 $ 50,701 Liabilities assumed in acquisitions — 1,676 1,676 New asset retirement obligations 2,325 — 2,325 Accretion 1,887 1,567 3,454 Changes in estimates recorded to statement of income 13 — 13 Changes in estimates recorded to balance sheet 1,370 — 1,370 Expenditures (5,490 ) (259 ) (5,749 ) Currency translation and other (323 ) (203 ) (526 ) Balance at September 30, 2015 $ 29,714 $ 23,550 $ 53,264

REMEDIAL LIABILITIES (Tables)

REMEDIAL LIABILITIES (Tables)	9 Months Ended
REMEDIAL LIABILITIES (Tables)	Sep. 30, 2015
Environmental Remediation Obligations [Abstract]
Changes to remedial liabilities	The changes to remedial liabilities for the nine months ended September 30, 2015 were as follows (in thousands): Remedial Liabilities for Landfill Sites Remedial Liabilities for Inactive Sites Remedial Liabilities (Including Superfund) for Non-Landfill Operations Total Balance at January 1, 2015 $ 5,420 $ 68,528 $ 81,173 $ 155,121 Accretion 187 2,185 1,969 4,341 Changes in estimates recorded to statement of income (2,547 ) (250 ) 584 (2,213 ) Expenditures (110 ) (3,283 ) (7,631 ) (11,024 ) Currency translation and other (335 ) (99 ) (2,476 ) (2,910 ) Balance at September 30, 2015 $ 2,615 $ 67,081 $ 73,619 $ 143,315

FINANCING ARRANGEMENTS (Tables)

FINANCING ARRANGEMENTS (Tables)	9 Months Ended
FINANCING ARRANGEMENTS (Tables)	Sep. 30, 2015
Debt Disclosure [Abstract]
Summary of the entity's financial arrangements	The following table is a summary of the Company’s financing arrangements (in thousands): September 30, 2015 December 31, 2014 Senior unsecured notes, at 5.25%, due August 1, 2020 ("2020 Notes") $ 800,000 $ 800,000 Senior unsecured notes, at 5.125%, due June 1, 2021 ("2021 Notes") 595,000 595,000 Long-term obligations $ 1,395,000 $ 1,395,000

EARNINGS (LOSS) PER SHARE (Tabl

EARNINGS (LOSS) PER SHARE (Tables)	9 Months Ended
EARNINGS (LOSS) PER SHARE (Tables)	Sep. 30, 2015
Earnings Per Share [Abstract]
Reconciliation of basic and diluted earnings per share computations	The following are computations of basic and diluted earnings (loss) per share (in thousands except for per share amounts): Three Months Ended Nine Months Ended September 30, September 30, 2015 2014 2015 2014 Numerator for basic and diluted earnings per share: Net income (loss) $ 40,228 $ (93,337 ) $ 43,534 $ (55,705 ) Denominator: Basic shares outstanding 58,161 60,369 58,799 60,585 Dilutive effect of equity-based compensation awards 107 — 99 — Dilutive shares outstanding 58,268 60,369 58,898 60,585 Basic earnings (loss) per share: $ 0.69 $ (1.55 ) $ 0.74 $ (0.92 ) Diluted earnings (loss) per share: $ 0.69 $ (1.55 ) $ 0.74 $ (0.92 )

ACCUMULATED OTHER COMPREHENSI37

ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)	9 Months Ended
ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)	Sep. 30, 2015
Equity [Abstract]
Schedule of accumulated other comprehensive loss	The changes in accumulated other comprehensive loss by component and related tax effects for the nine months ended September 30, 2015 were as follows (in thousands): Foreign Currency Translation Unfunded Pension Liability Total Balance at January 1, 2015 $ (108,889 ) $ (1,953 ) $ (110,842 ) Other comprehensive loss before reclassifications (118,713 ) — (118,713 ) Tax effects — — — Other comprehensive loss $ (118,713 ) $ — $ (118,713 ) Balance at September 30, 2015 $ (227,602 ) $ (1,953 ) $ (229,555 )
Summary of amounts reclassified out of accumulated other comprehensive loss	The amounts reclassified out of accumulated other comprehensive loss into the consolidated statement of income (loss), with presentation location during the three and nine months ended September 30, 2014 , were as follows (in thousands): For the Three Months Ended For the Nine Months Ended Comprehensive Loss Components September 30, 2014 September 30, 2014 Location Unrealized gains on available-for-sale investments $ 27 $ 3,388 Other (expense) income

STOCK-BASED COMPENSATION (Table

STOCK-BASED COMPENSATION (Tables)	9 Months Ended
STOCK-BASED COMPENSATION (Tables)	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of total number, weighted-average grant-date fair value, and types of awards granted	The following table summarizes information about restricted stock awards for the nine months ended September 30, 2015 : Restricted Stock Number of Shares Weighted Average Grant-Date Fair Value Unvested January 1, 2015 383,021 $ 56.51 Granted 142,434 $ 55.00 Vested (124,822 ) $ 55.85 Forfeited (37,972 ) $ 56.48 Unvested September 30, 2015 362,661 $ 56.15
Summary of performance stock awards	The following table summarizes information about performance stock awards for the nine months ended September 30, 2015 : Performance Stock Number of Shares Weighted Average Grant-Date Fair Value Unvested January 1, 2015 143,875 $ 60.94 Granted 167,906 $ 56.41 Vested (6,129 ) $ 54.28 Forfeited (20,049 ) $ 59.39 Unvested September 30, 2015 285,603 $ 58.53

SEGMENT REPORTING (Tables)

SEGMENT REPORTING (Tables)	9 Months Ended
SEGMENT REPORTING (Tables)	Sep. 30, 2015
Segment Reporting [Abstract]
Reconciliation of third party revenues to direct revenues	The following table reconciles third party revenues to direct revenues for the three and nine months ended September 30, 2015 and 2014 (in thousands): For the Three Months Ended September 30, 2015 For the Three Months Ended September 30, 2014 Third party revenues Intersegment revenues, net Corporate Items, net Direct revenues Third party revenues Intersegment revenues, net Corporate Items, net Direct revenues Technical Services $ 253,069 $ 34,819 $ 506 $ 288,394 $ 272,478 $ 39,296 $ 1,628 $ 313,402 Industrial and Field Services 307,226 (6,973 ) (313 ) 299,940 163,582 (9,234 ) 29 154,377 Kleen Performance Products 100,827 (23,744 ) (6 ) 77,077 140,345 (52,606 ) — 87,739 SK Environmental Services 171,832 (5,947 ) 2 165,887 170,980 21,212 — 192,192 Lodging Services 13,507 743 30 14,280 36,582 697 26 37,305 Oil and Gas Field Services 46,788 1,102 92 47,982 67,370 635 4 68,009 Corporate Items 117 — (311 ) (194 ) 128 — (1,687 ) (1,559 ) Total $ 893,366 $ — $ — $ 893,366 $ 851,465 $ — $ — $ 851,465 For the Nine Months Ended September 30, 2015 For the Nine Months Ended September 30, 2014 Third party revenues Intersegment revenues, net Corporate Items, net Direct revenues Third party revenues Intersegment revenues, net Corporate Items, net Direct revenues Technical Services $ 741,419 $ 108,037 $ 2,886 $ 852,342 $ 766,057 $ 116,812 $ 2,805 $ 885,674 Industrial and Field Services 807,423 (24,764 ) (636 ) 782,023 510,696 (32,039 ) 220 478,877 Kleen Performance Products 296,738 (63,429 ) (8 ) 233,301 413,282 (155,583 ) (5 ) 257,694 SK Environmental Services 508,392 (26,331 ) 5 482,066 503,692 64,476 (58 ) 568,110 Lodging Services 68,782 1,899 127 70,808 136,148 1,991 52 138,191 Oil and Gas Field Services 138,992 4,588 141 143,721 226,319 4,343 (6 ) 230,656 Corporate Items 347 — (2,515 ) (2,168 ) 418 — (3,008 ) (2,590 ) Total $ 2,562,093 $ — $ — $ 2,562,093 $ 2,556,612 $ — $ — $ 2,556,612
Reconciliation to consolidated statements of income to adjusted EBITDA	The following table presents Adjusted EBITDA information used by management for each reportable segment (in thousands). The Company does not allocate interest expense, income taxes, depreciation, amortization, accretion of environmental liabilities, other non-cash charges not deemed representative of fundamental segment results, and other expense (income) to its segments. For the Three Months Ended For the Nine Months Ended September 30, September 30, 2015 2014 2015 2014 Adjusted EBITDA: Technical Services $ 79,048 $ 86,928 $ 219,257 $ 233,402 Industrial and Field Services 62,460 20,303 145,850 67,391 Kleen Performance Products 12,123 21,473 23,471 49,252 SK Environmental Services 40,096 30,853 108,540 84,985 Lodging Services 1,827 15,972 12,589 49,196 Oil and Gas Field Services 1,579 9,545 800 27,688 Corporate Items (31,526 ) (31,717 ) (103,501 ) (120,772 ) Total $ 165,607 $ 153,357 $ 407,006 $ 391,142 Reconciliation to Consolidated Statements of Income: Accretion of environmental liabilities 2,577 2,642 7,795 7,975 Depreciation and amortization 69,060 70,049 205,189 205,480 Goodwill impairment charge — 123,414 31,992 123,414 Income (loss) from operations 93,970 (42,748 ) 162,030 54,273 Other expense (income) 139 (613 ) 390 (4,136 ) Interest expense, net of interest income 19,017 19,494 57,704 58,430 Income (loss) before provision for income taxes $ 74,814 $ (61,629 ) $ 103,936 $ (21 )
PP&E, intangible assets and total assets by segment	The following table presents certain assets by reportable segment and in the aggregate (in thousands): September 30, 2015 Technical Industrial and Field Kleen Performance Products SK Environmental Services Lodging Services Oil and Gas Field Corporate Totals Property, plant and equipment, net $ 464,705 $ 242,007 $ 193,576 $ 258,178 $ 112,708 $ 168,630 $ 91,744 $ 1,531,548 Goodwill 49,426 106,043 49,972 209,089 33,388 — — 447,918 Permits and other intangible, net 74,885 15,375 142,898 260,327 7,791 17,719 — 518,995 Total assets $ 806,451 $ 392,284 $ 497,627 $ 793,163 $ 187,461 $ 264,910 $ 657,965 $ 3,599,861 December 31, 2014 Technical Industrial and Field Kleen Performance Products SK Environmental Services Lodging Services Oil and Gas Field Corporate Totals Property, plant and equipment, net $ 412,323 $ 245,115 $ 201,451 $ 240,078 $ 141,965 $ 215,574 $ 102,328 $ 1,558,834 Goodwill 50,092 109,214 50,883 173,873 34,863 33,744 — 452,669 Permits and other intangible, net 74,870 17,801 151,041 252,897 10,744 22,727 — 530,080 Total assets $ 756,169 $ 392,652 $ 538,921 $ 731,072 $ 231,782 $ 361,223 $ 692,459 $ 3,704,278
Total assets by geographical area	The following table presents total assets by geographical area (in thousands): September 30, 2015 December 31, 2014 United States $ 2,681,409 $ 2,572,494 Canada 914,690 1,128,458 Other foreign 3,762 3,326 Total $ 3,599,861 $ 3,704,278

GUARANTOR AND NON-GUARANTOR S40

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Tables)	9 Months Ended
	Sep. 30, 2015
Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract]
Schedule of condensed consolidating balance sheet	Following is the condensed consolidating balance sheet at September 30, 2015 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Assets: Cash and cash equivalents $ 11,008 $ 66,074 $ 102,109 $ — $ 179,191 Intercompany receivables 156,833 210,159 30,572 (397,564 ) — Accounts receivable, net — 493,459 106,824 — 600,283 Other current assets — 220,901 72,180 — 293,081 Property, plant and equipment, net — 1,056,190 475,358 — 1,531,548 Investments in subsidiaries 2,566,095 547,520 — (3,113,615 ) — Intercompany debt receivable — 285,385 3,701 (289,086 ) — Goodwill — 359,068 88,850 — 447,918 Permits and other intangibles, net — 441,639 77,356 — 518,995 Other long-term assets 14,342 9,039 5,464 — 28,845 Total assets $ 2,748,278 $ 3,689,434 $ 962,414 $ (3,800,265 ) $ 3,599,861 Liabilities and Stockholders’ Equity: Current liabilities $ 18,558 $ 523,971 $ 82,487 $ — $ 625,016 Intercompany payables 208,298 187,406 1,860 (397,564 ) — Closure, post-closure and remedial liabilities, net — 155,386 19,291 — 174,677 Long-term obligations 1,395,000 — — — 1,395,000 Intercompany debt payable 3,701 — 285,385 (289,086 ) — Other long-term liabilities — 256,576 25,871 — 282,447 Total liabilities 1,625,557 1,123,339 414,894 (686,650 ) 2,477,140 Stockholders’ equity 1,122,721 2,566,095 547,520 (3,113,615 ) 1,122,721 Total liabilities and stockholders’ equity $ 2,748,278 $ 3,689,434 $ 962,414 $ (3,800,265 ) $ 3,599,861 Following is the condensed consolidating balance sheet at December 31, 2014 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Assets: Cash and cash equivalents $ 1,006 $ 154,147 $ 91,726 $ — $ 246,879 Intercompany receivables 133,219 156,920 39,724 (329,863 ) — Accounts receivables — 414,205 142,926 — 557,131 Other current assets — 241,232 81,191 — 322,423 Property, plant and equipment, net — 970,757 588,077 — 1,558,834 Investments in subsidiaries 2,694,727 663,191 — (3,357,918 ) — Intercompany debt receivable — 327,634 3,701 (331,335 ) — Goodwill — 324,930 127,739 — 452,669 Permits and other intangibles, net — 435,906 94,174 — 530,080 Other long-term assets 16,801 12,959 6,502 — 36,262 Total assets $ 2,845,753 $ 3,701,881 $ 1,175,760 $ (4,019,116 ) $ 3,704,278 Liabilities and Stockholders’ Equity: Current liabilities $ 20,820 $ 444,059 $ 107,592 $ — $ 572,471 Intercompany payables 163,361 164,231 2,271 (329,863 ) — Closure, post-closure and remedial liabilities, net — 158,622 25,109 — 183,731 Long-term obligations 1,395,000 — — — 1,395,000 Intercompany debt payable 3,701 — 327,634 (331,335 ) — Other long-term liabilities — 240,242 49,963 — 290,205 Total liabilities 1,582,882 1,007,154 512,569 (661,198 ) 2,441,407 Stockholders’ equity 1,262,871 2,694,727 663,191 (3,357,918 ) 1,262,871 Total liabilities and stockholders’ equity $ 2,845,753 $ 3,701,881 $ 1,175,760 $ (4,019,116 ) $ 3,704,278
Schedule of consolidating statement of income	Following is the consolidating statement of income (loss) for the three months ended September 30, 2015 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Revenues Service revenues $ — $ 612,814 $ 162,680 $ (14,827 ) $ 760,667 Product revenues — 117,653 17,591 (2,545 ) 132,699 Total revenues — 730,467 180,271 (17,372 ) 893,366 Cost of revenues (exclusive of items shown separately below) Service cost of revenues — 413,878 124,625 (14,827 ) 523,676 Product cost of revenues — 101,778 11,737 (2,545 ) 110,970 Total cost of revenues — 515,656 136,362 (17,372 ) 634,646 Selling, general and administrative expenses 25 72,811 20,277 — 93,113 Accretion of environmental liabilities — 2,277 300 — 2,577 Depreciation and amortization — 46,951 22,109 — 69,060 Goodwill impairment charge — — — — — (Loss) income from operations (25 ) 92,772 1,223 — 93,970 Other income (expense) — 204 (343 ) — (139 ) Interest (expense) income (19,671 ) 613 41 — (19,017 ) Equity in earnings of subsidiaries, net of taxes 52,046 (2,341 ) — (49,705 ) — Intercompany interest income (expense) — 5,666 (5,666 ) — — Income (loss) before provision for income taxes 32,350 96,914 (4,745 ) (49,705 ) 74,814 (Benefit) provision for income taxes (7,878 ) 44,868 (2,404 ) — 34,586 Net income (loss) 40,228 52,046 (2,341 ) (49,705 ) 40,228 Other comprehensive loss (53,541 ) (53,541 ) (34,150 ) 87,691 (53,541 ) Comprehensive loss $ (13,313 ) $ (1,495 ) $ (36,491 ) $ 37,986 $ (13,313 ) Following is the consolidating statement of income (loss) for the three months ended September 30, 2014 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Revenues Service revenues $ — $ 420,906 $ 235,569 $ 746 $ 657,221 Product revenues — 167,492 26,713 39 194,244 Total revenues — 588,398 262,282 785 851,465 Cost of revenues (exclusive of items shown separately below) Service cost of revenues — 265,940 173,575 746 440,261 Product cost of revenues — 149,270 8,837 39 158,146 Total cost of revenues — 415,210 182,412 785 598,407 Selling, general and administrative expenses 25 71,139 28,537 — 99,701 Accretion of environmental liabilities — 2,295 347 — 2,642 Depreciation and amortization — 44,305 25,744 — 70,049 Goodwill impairment charge — 105,466 17,948 — 123,414 (Loss) income from operations (25 ) (50,017 ) 7,294 — (42,748 ) Other income (expense) — 2,592 (1,979 ) — 613 Interest (expense) income (19,622 ) 85 43 — (19,494 ) Equity in earnings of subsidiaries, net of taxes (81,549 ) (7,361 ) — 88,910 — Intercompany interest income (expense) — 6,148 (6,148 ) — — Loss before (benefit) provision for income taxes (101,196 ) (48,553 ) (790 ) 88,910 (61,629 ) (Benefit) provision for income taxes (7,859 ) 32,996 6,571 — 31,708 Net loss (93,337 ) (81,549 ) (7,361 ) 88,910 (93,337 ) Other comprehensive (loss) income (49,092 ) (49,092 ) 32,335 16,757 (49,092 ) Comprehensive (loss) income $ (142,429 ) $ (130,641 ) $ 24,974 $ 105,667 $ (142,429 ) Following is the consolidating statement of income (loss) for the nine months ended September 30, 2015 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Revenues Service revenues $ — $ 1,659,739 $ 546,790 $ (48,185 ) $ 2,158,344 Product revenues — 349,524 63,239 (9,014 ) 403,749 Total revenues — 2,009,263 610,029 (57,199 ) 2,562,093 Cost of revenues (exclusive of items shown separately below) Service cost of revenues — 1,106,591 426,530 (48,185 ) 1,484,936 Product cost of revenues — 315,322 42,597 (9,014 ) 348,905 Total cost of revenues — 1,421,913 469,127 (57,199 ) 1,833,841 Selling, general and administrative expenses 75 247,472 73,699 — 321,246 Accretion of environmental liabilities — 6,870 925 — 7,795 Depreciation and amortization — 137,354 67,835 — 205,189 Goodwill impairment charge — 4,164 27,828 — 31,992 (Loss) income from operations (75 ) 191,490 (29,385 ) — 162,030 Other income (expense) — 483 (873 ) — (390 ) Interest (expense) income (58,962 ) 1,115 143 — (57,704 ) Equity in earnings of subsidiaries, net of taxes 78,956 (38,920 ) — (40,036 ) — Intercompany interest income (expense) — 17,679 (17,679 ) — — Income (loss) before (benefit) provision for income taxes 19,919 171,847 (47,794 ) (40,036 ) 103,936 (Benefit) provision for income taxes (23,615 ) 92,891 (8,874 ) — 60,402 Net income (loss) 43,534 78,956 (38,920 ) (40,036 ) 43,534 Other comprehensive loss (118,713 ) (118,713 ) (76,752 ) 195,465 (118,713 ) Comprehensive loss $ (75,179 ) $ (39,757 ) $ (115,672 ) $ 155,429 $ (75,179 ) Following is the consolidating statement of income (loss) for the nine months ended September 30, 2014 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Revenues Service revenues $ — $ 1,325,266 $ 647,469 $ (10,664 ) $ 1,962,071 Product revenues — 475,429 122,343 (3,231 ) 594,541 Total revenues — 1,800,695 769,812 (13,895 ) 2,556,612 Cost of revenues (exclusive of items shown separately below) Service cost of revenues — 872,999 471,108 (10,664 ) 1,333,443 Product cost of revenues — 403,007 97,857 (3,231 ) 497,633 Total cost of revenues — 1,276,006 568,965 (13,895 ) 1,831,076 Selling, general and administrative expenses 82 241,317 92,995 — 334,394 Accretion of environmental liabilities — 6,931 1,044 — 7,975 Depreciation and amortization — 128,496 76,984 — 205,480 Goodwill impairment charge — 105,466 17,948 — 123,414 (Loss) income from operations (82 ) 42,479 11,876 — 54,273 Other income — 2,716 1,420 — 4,136 Interest (expense) income (58,968 ) 537 1 — (58,430 ) Equity in earnings of subsidiaries, net of taxes (20,275 ) (13,525 ) — 33,800 — Intercompany dividend income — — 6,238 (6,238 ) — Intercompany interest income (expense) — 24,368 (24,368 ) — — (Loss) income before (benefit) provision for income taxes (79,325 ) 56,575 (4,833 ) 27,562 (21 ) (Benefit) provision for income taxes (23,620 ) 76,850 2,454 — 55,684 Net loss (55,705 ) (20,275 ) (7,287 ) 27,562 (55,705 ) Other comprehensive (loss) income (54,561 ) (54,561 ) 9,090 45,471 (54,561 ) Comprehensive (loss) income $ (110,266 ) $ (74,836 ) $ 1,803 $ 73,033 $ (110,266 )
Schedule of condensed consolidating statement of cash flows	Following is the condensed consolidating statement of cash flows for the nine months ended September 30, 2015 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Net cash from operating activities $ 9,503 $ 240,713 $ 59,377 $ — $ 309,593 Cash flows used in investing activities: Additions to property, plant and equipment — (162,329 ) (27,670 ) — (189,999 ) Proceeds from sales of fixed assets — 1,177 2,563 — 3,740 Acquisitions, net of cash acquired — (79,610 ) — — (79,610 ) Costs to obtain or renew permits — (4 ) (4,629 ) — (4,633 ) Intercompany — (71,182 ) 71,182 — Net cash used in investing activities — (311,948 ) (29,736 ) 71,182 (270,502 ) Cash flows used in financing activities: Change in uncashed checks — (16,635 ) (5,247 ) — (21,882 ) Exercise of stock options 397 — — — 397 Issuance of restricted shares, net of shares remitted (2,027 ) — — — (2,027 ) Repurchases of common stock (69,155 ) — — — (69,155 ) Excess tax benefit of stock-based compensation 102 — — — 102 Payments on capital leases — (203 ) (297 ) — (500 ) Intercompany 71,182 — — (71,182 ) — Net cash used in financing activities 499 (16,838 ) (5,544 ) (71,182 ) (93,065 ) Effect of exchange rate change on cash — — (13,714 ) — (13,714 ) Increase (decrease) in cash and cash equivalents 10,002 (88,073 ) 10,383 — (67,688 ) Cash and cash equivalents, beginning of period 1,006 154,147 91,726 — 246,879 Cash and cash equivalents, end of period $ 11,008 $ 66,074 $ 102,109 $ — $ 179,191 Following is the condensed consolidating statement of cash flows for the nine months ended September 30, 2014 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Net cash (used in) from operating activities $ (5,193 ) $ 139,640 $ 80,178 $ (18,586 ) $ 196,039 Cash flows used in investing activities: Additions to property, plant and equipment — (133,320 ) (65,557 ) — (198,877 ) Proceeds from sale of fixed assets — 3,634 2,279 — 5,913 Acquisitions, net of cash acquired — (6,150 ) — — (6,150 ) Costs to obtain or renew permits — (589 ) (4,854 ) — (5,443 ) Proceeds from sale of long term investments — — 12,947 — 12,947 Intercompany — (55,997 ) — 55,997 — Other — — 914 914 Net cash used in investing activities — (192,422 ) (54,271 ) 55,997 (190,696 ) Cash flows from (used in) financing activities: Change in uncashed checks — 579 (1,170 ) — (591 ) Proceeds from employee stock purchase plan 4,364 — — — 4,364 Issuance of restricted shares, net of shares remitted (2,668 ) — — — (2,668 ) Repurchases of common stock (48,329 ) — — — (48,329 ) Excess tax benefit of stock-based compensation 829 — — — 829 Repayment of long-term obligations (5,000 ) — — — (5,000 ) Payments of capital leases — (129 ) (1,553 ) — (1,682 ) Dividends paid — (18,586 ) — 18,586 — Intercompany 55,997 — — (55,997 ) — Net cash from (used in) financing activities 5,193 (18,136 ) (2,723 ) (37,411 ) (53,077 ) Effect of exchange rate change on cash — — (4,318 ) — (4,318 ) Decrease in cash and cash equivalents — (70,918 ) 18,866 — (52,052 ) Cash and cash equivalents, beginning of period 1,006 235,445 73,622 — 310,073 Cash and cash equivalents, end of period $ 1,006 $ 164,527 $ 92,488 $ — $ 258,021

BUSINESS COMBINATIONS (Narrativ

BUSINESS COMBINATIONS (Narrative) (Details) - Thermo Fluids Inc. [Member] - USD ($) $ in Millions	Apr. 11, 2015	Sep. 30, 2015	Sep. 30, 2015
Business Acquisition [Line Items]
Preliminary purchase price	$ 77.1
TFI's revenues included in the Company's results of operations		$ 13.1	$ 24.8
Acquisition related costs		$ 0.1	$ 0.5

BUSINESS COMBINATIONS (Assets A

BUSINESS COMBINATIONS (Assets Aquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2015	Apr. 11, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Measurement period adjustments, accounts receivable	$ (444)
Measurement period adjustment, inventories and supplies	0
Measurement period adjustment, prepaid and other current assets	8
Measurement period adjustments, property, plant and equipment	(1,606)
Measurement period adjustments, permits and other intangibles	(1,500)
Measurement period adjustments, current liabilities	0
Measurement period adjustments, closure and post-closure liabilities	0
Measurement period adjustments, deferred taxes, unrecognized tax benefits and other long-term liabilities	1,832
Measurement period adjustments, total identifiable net assets	(1,710)
Goodwill	447,918		$ 452,669
Measurement period adjustments, goodwill	1,710
Measurement period adjustments, total	0
Thermo Fluids Inc. [Member]
Business Acquisition [Line Items]
Accounts receivable	6,665	$ 7,109
Inventories and supplies	1,791	1,791
Prepaid and other current assets	1,757	1,749
Property, plant and equipment	28,862	30,468
Permits and other intangibles	18,500	20,000
Current liabilities	(5,859)	(5,859)
Closure and post-closure liabilities	(1,676)	(1,676)
Deferred taxes, unrecognized tax benefits and other long-term liabilities	(11,249)	(13,081)
Total identifiable net assets	38,791	40,501
Goodwill	38,301	36,591
Total	$ 77,092	$ 77,092

INVENTORIES AND SUPPLIES (Detai

INVENTORIES AND SUPPLIES (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Oil and oil products	$ 35,484	$ 62,111
Supplies and drums	75,357	68,547
Solvent and solutions	9,742	9,355
Modular camp accommodations	14,738	15,776
Other	14,934	12,874
Total inventories and supplies	$ 150,255	$ 168,663

PROPERTY, PLANT AND EQUIPMENT44

PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,651,107		$ 2,651,107		$ 2,564,340
Less - accumulated depreciation and amortization	1,119,559		1,119,559		1,005,506
Total property, plant and equipment, net	1,531,548		1,531,548		1,558,834
Interest costs capitalized adjustment	600	$ 100	1,200	$ 400
Depreciation inclusive of amortization	59,200	$ 60,900	175,500	$ 178,000
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	100,811		100,811		98,507
Asset retirement costs (non-landfill)
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	12,455		12,455		10,871
Landfill assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	126,904		126,904		110,984
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	338,791		338,791		338,242
Camp equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	155,363		155,363		180,575
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	495,270		495,270		471,615
Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,312,699		1,312,699		1,302,424
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,330		5,330		5,517
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 103,484		$ 103,484		$ 45,605

GOODWILL AND OTHER INTANGIBLE45

GOODWILL AND OTHER INTANGIBLE ASSETS (Rollforward of Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Goodwill [Roll Forward]
Balance at beginning of year			$ 452,669
Acquired from TFI acquisition			38,301
Measurement period adjustment from prior acquisitions			3,841
Goodwill impairment charge	$ 0	$ 123,414	31,992	$ 123,414
Foreign currency translation			(14,901)
Balance at end of year	$ 447,918		$ 447,918

GOODWILL AND OTHER INTANGIBLE46

GOODWILL AND OTHER INTANGIBLE ASSETS (Amortizable Other Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	$ 570,957		$ 570,957		$ 558,605
Accumulated Amortization	175,042		175,042		152,089
Net	395,915		$ 395,915		$ 406,516
Weighted Average Remaining Amortization Period (in years)			10 years 157 days		11 years 4 months 18 days
Total permits and other intangible assets, Cost	694,037		$ 694,037		$ 682,169
Total permits and other intangible assets, Net	518,995		518,995		530,080
Amortization of intangible assets	9,900	$ 9,100	29,700	$ 27,500
Trademarks and trade names
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible asset, cost	123,080		123,080		123,564
Permits
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	161,641		161,641		156,692
Accumulated Amortization	60,091		60,091		55,318
Net	101,550		$ 101,550		$ 101,374
Weighted Average Remaining Amortization Period (in years)			18 years 329 days		19 years
Customer and supplier relationships
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	377,373		$ 377,373		$ 370,373
Accumulated Amortization	93,786		93,786		77,697
Net	283,587		$ 283,587		$ 292,676
Weighted Average Remaining Amortization Period (in years)			10 years 95 days		11 years
Other intangible assets
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	31,943		$ 31,943		$ 31,540
Accumulated Amortization	21,165		21,165		19,074
Net	$ 10,778		$ 10,778		$ 12,466
Weighted Average Remaining Amortization Period (in years)			2 years 69 days		3 years 2 months

GOODWILL AND OTHER INTANGIBLE47

GOODWILL AND OTHER INTANGIBLE ASSETS (Expected Future Amortization) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
2015 (three months)	$ 9,466
2,016	37,397
2,017	34,702
2,018	31,409
2,019	28,248
Thereafter	254,693
Net	$ 395,915	$ 406,516

GOODWILL AND OTHER INTANGIBLE48

GOODWILL AND OTHER INTANGIBLE ASSETS (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill	$ 447,918		$ 447,918			$ 452,669
Property, plant and equipment, net	1,531,548		1,531,548			1,558,834
Goodwill impairment charge	0	$ 123,414	31,992	$ 123,414
Permits and other intangible, net	518,995		518,995			530,080
Oil and Gas Field Services
Goodwill [Line Items]
Goodwill	32,000		32,000		$ 32,000
Goodwill	0		0		$ 0	33,744
Property, plant and equipment, net	168,630		168,630			215,574
Goodwill impairment charge			31,992
Permits and other intangible, net	17,719		17,719			22,727
Kleen Performance Products
Goodwill [Line Items]
Goodwill	49,972		49,972			50,883
Property, plant and equipment, net	193,576		193,576			201,451
Permits and other intangible, net	142,898		142,898			$ 151,041
Customer and Supplier Relationships \| Oil and Gas Field Services
Goodwill [Line Items]
Permits and other intangible, net	9,200		9,200
Other intangible assets \| Oil and Gas Field Services
Goodwill [Line Items]
Permits and other intangible, net	$ 8,500		$ 8,500

ACCRUED EXPENSES (Details)

ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Insurance	$ 55,114	$ 58,931
Interest	17,623	20,527
Accrued compensation and benefits	49,083	59,006
Income, real estate, sales and other taxes	77,837	38,297
Other	45,133	42,788
Total accrued expenses	$ 244,790	$ 219,549

CLOSURE AND POST-CLOSURE LIAB50

CLOSURE AND POST-CLOSURE LIABILITIES (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015
Changes to post-closure liabilities
Balance at beginning of year		$ 50,701
Liabilities assumed in acquisitions	$ 1,676
New asset retirement obligations		2,325
Accretion		3,454
Changes in estimates recorded to statement of income		13
Changes in estimates recorded to balance sheet		1,370
Expenditures		(5,749)
Currency translation and other		(526)
Balance at end of year	53,264	$ 53,264
Credit-adjusted risk-free rate (as a percent)		5.99%
Landfill Retirement Liability
Changes to post-closure liabilities
Balance at beginning of year		$ 29,932
Liabilities assumed in acquisitions	0
New asset retirement obligations		2,325
Accretion		1,887
Changes in estimates recorded to statement of income		13
Changes in estimates recorded to balance sheet		1,370
Expenditures		(5,490)
Currency translation and other		(323)
Balance at end of year	29,714	29,714
Non-Landfill Retirement Liability
Changes to post-closure liabilities
Balance at beginning of year		20,769
Liabilities assumed in acquisitions	1,676
New asset retirement obligations		0
Accretion		1,567
Changes in estimates recorded to statement of income		0
Changes in estimates recorded to balance sheet		0
Expenditures		(259)
Currency translation and other		(203)
Balance at end of year	$ 23,550	$ 23,550

REMEDIAL LIABILITIES (Details)

REMEDIAL LIABILITIES (Details) $ in Thousands	9 Months Ended
REMEDIAL LIABILITIES (Details) $ in Thousands	Sep. 30, 2015USD ($)
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	$ 155,121
Accretion	4,341
Changes in estimates recorded to statement of income	(2,213)
Expenditures	(11,024)
Currency translation and other	(2,910)
Balance at end of year	143,315
Remedial Liabilities for Landfill Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	5,420
Accretion	187
Changes in estimates recorded to statement of income	(2,547)
Expenditures	(110)
Currency translation and other	(335)
Balance at end of year	2,615
Remedial Liabilities for Inactive Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	68,528
Accretion	2,185
Changes in estimates recorded to statement of income	(250)
Expenditures	(3,283)
Currency translation and other	(99)
Balance at end of year	67,081
Remedial Liabilities (Including Superfund) for Non-Landfill Operations
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	81,173
Accretion	1,969
Changes in estimates recorded to statement of income	584
Expenditures	(7,631)
Currency translation and other	(2,476)
Balance at end of year	$ 73,619

FINANCING ARRANGEMENTS (Details

FINANCING ARRANGEMENTS (Details) - USD ($)	9 Months Ended
FINANCING ARRANGEMENTS (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Financing arrangements
Long-term obligations	$ 1,395,000,000	$ 1,395,000,000
Revolving credit facility, maximum borrowing capacity	0	0
Line of credit facility available borrowing capacity	232,000,000	238,400,000
Letters of credit amount outstanding	144,300,000	134,500,000
Unsecured debt \| Unsecured senior notes 2020
Financing arrangements
Senior unsecured notes	$ 800,000,000	$ 800,000,000
Stated interest rate	5.25%	5.25%
Fair value	$ 812,000,000	$ 804,000,000
Unsecured debt \| Unsecured senior notes 2021
Financing arrangements
Senior unsecured notes	$ 595,000,000	$ 595,000,000
Stated interest rate	5.125%	5.125%
Fair value	$ 602,400,000	$ 595,000,000
Parent and domestic subsidiaries
Financing arrangements
Credit available subject to percentage of accounts receivable	85.00%
Credit available subject to percentage of cash deposited	100.00%
Canadian subsidiaries
Financing arrangements
Credit available subject to percentage of accounts receivable	85.00%
Credit available subject to percentage of cash deposited	100.00%

EARNINGS (LOSS) PER SHARE (Narr

EARNINGS (LOSS) PER SHARE (Narrative) (Details) - shares	3 Months Ended		9 Months Ended
EARNINGS (LOSS) PER SHARE (Narrative) (Details) - shares	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Restricted stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from computation of earning per share (in shares)	10,704	624,145	42,642	624,145
Performance stock award
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from computation of earning per share (in shares)	274,257		274,257

EARNINGS (LOSS) PER SHARE (Comp

EARNINGS (LOSS) PER SHARE (Computation of Basic and Diluted Earnings Per Share)(Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Numerator for basic and diluted earnings per share:
Net income (loss)	$ 40,228	$ (93,337)	$ 43,534	$ (55,705)
Denominator:
Basic shares outstanding	58,161	60,369	58,799	60,585
Dilutive effect of equity-based compensation awards	107	0	99	0
Dilutive shares outstanding	58,268	60,369	58,898	60,585
Basic earnings per share (in USD per share)	$ 0.69	$ (1.55)	$ 0.74	$ (0.92)
Diluted earnings per share (in USD per share)	$ 0.69	$ (1.55)	$ 0.74	$ (0.92)

ACCUMULATED OTHER COMPREHENSI55

ACCUMULATED OTHER COMPREHENSIVE LOSS (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Beginning balance			$ (110,842)
Other Comprehensive Income (Loss), before Reclassifications, before Tax			(118,713)
Tax effects			0
Other comprehensive loss	$ (53,541)	$ (49,092)	(118,713)	$ (54,561)
Ending balance	(229,555)		(229,555)
Foreign Currency Translation
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Beginning balance			(108,889)
Other Comprehensive Income (Loss), before Reclassifications, before Tax			(118,713)
Tax effects			0
Other comprehensive loss			(118,713)
Ending balance	(227,602)		(227,602)
Unfunded Pension Liability
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Beginning balance			(1,953)
Other Comprehensive Income (Loss), before Reclassifications, before Tax			0
Tax effects			0
Other comprehensive loss			0
Ending balance	$ (1,953)		$ (1,953)

ACCUMULATED OTHER COMPREHENSI56

ACCUMULATED OTHER COMPREHENSIVE LOSS (Amount Reclassified Out of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Unrealized gains on available-for-sale investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other (expense) income	$ 27	$ 3,388

STOCK-BASED COMPENSATION (Narra

STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($) shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Mar. 13, 2015	Mar. 12, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 500,000	$ 2,100,000	$ 6,600,000	$ 6,400,000
Income tax benefit	$ 100,000	$ 500,000	$ 1,800,000	$ 1,500,000
Repurchases of common stock (in shares)	0.8	0.6	1.3	0.9
Repurchases of common stock	$ 37,600,000	$ 37,600,000	$ 69,813,000	$ 53,800,000
Employee Stock Purchase Plan 2005
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share repurchase program shares authorized					$ 300,000,000	$ 150,000,000
Repurchases of common stock (in shares)			3.3
Repurchases of common stock			$ 174,200,000
Stock repurchase program, remaining authorized repurchase amount	125,800,000		125,800,000
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	13,200,000		$ 13,200,000
Period for recognition			3 years 73 days
Fair value restricted stock	600,000	1,500,000	$ 6,800,000	9,100,000
Performance stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	1,400,000		900,000
Unrecognized compensation cost	900,000		900,000
Fair value restricted stock	$ 0	$ 0	$ 300,000	$ 0
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restriction period			3 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restriction period			5 years

STOCK-BASED COMPENSATION (Restr

STOCK-BASED COMPENSATION (Restricted Stock) (Details) - Restricted stock awards	9 Months Ended
	Sep. 30, 2015$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested beginning balance	383,021
Number of shares, granted	142,434
Number of shares, vested	(124,822)
Number of shares, forfeited	(37,972)
Unvested ending balance	362,661
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Fair value beginning of period \| $ / shares	$ 56.51
Fair value, granted \| $ / shares	55
Fair value, vested \| $ / shares	55.85
Fair value, forfeited \| $ / shares	56.48
Fair value end of period \| $ / shares	$ 56.15

STOCK-BASED COMPENSATION (Perfo

STOCK-BASED COMPENSATION (Performance Stock Awards (Details) - Performance stock awards	9 Months Ended
	Sep. 30, 2015$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested beginning balance	143,875
Number of shares, granted	167,906
Number of shares, vested	(6,129)
Number of shares, forfeited	(20,049)
Unvested ending balance	285,603
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Fair value beginning of period \| $ / shares	$ 60.94
Fair value, granted \| $ / shares	56.41
Fair value, vested \| $ / shares	54.28
Fair value, forfeited \| $ / shares	59.39
Fair value end of period \| $ / shares	$ 58.53

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) CAD in Millions	1 Months Ended		9 Months Ended	12 Months Ended
COMMITMENTS AND CONTINGENCIES (Details) CAD in Millions	Jun. 30, 2015USD ($)	Oct. 31, 2010customer	Sep. 30, 2015USD ($)Proceedingssitesfaciltiesclaims	Dec. 31, 2012CAD	Dec. 31, 2002a	Dec. 31, 1999Municipalities	Dec. 31, 1968Permits	Dec. 31, 2014USD ($)
Contingencies [Line Items]
Recorded reserves for actual or probable liabilities \| $			$ 30,000,000					$ 33,600,000
Accrued remedial liabilities \| $			$ 143,315,000					155,121,000
Number of pending personal injury claims allegedly resulting from the used of Safety-Kleen's products \| Proceedings			54
Number of product liability claims settled or dismissed \| claims			29
Number of customers filing a complaint \| customer		2
Litigation Settlement, Amount \| $	$ 100,000
Legal and Administrative Proceedings
Contingencies [Line Items]
Recorded reserves for actual or probable liabilities \| $			$ 23,400,000					27,700,000
Possible increase in legal and administrative proceedings \| $			2,400,000					2,900,000
Ville Mercier
Contingencies [Line Items]
Number of permits issued by government, for dumping organic liquid \| Permits							2
Number of neighboring municipalities filing separate legal proceedings against the Mercier Subsidiary and the Government of Quebec \| Municipalities						3
General damages sought \| CAD				CAD 2.9
Punitive damages sought \| CAD				CAD 10
Accrued remedial liabilities \| $			$ 11,200,000					12,700,000
Superfund Proceedings
Contingencies [Line Items]
Number of sites owned by third party excluded from cleanup or related liabilities			128
Number of sites owned by the entity subject to proceedings under federal or state superfund laws \| facilties			2
Notices received from owners of third party sites seeking indemnification from the company			126
Number of sites for which environmental remediation expense is settled			29
Third party sites requiring expenditure on remediation			22
Number of sites not currently requiring expenditures on remediation			75
Number of sites which potential liability could exceed $100,000			12
Notices received from owners of third party sites seeking indemnification from the company			6
Wichita Property
Contingencies [Line Items]
State-designated superfund site acquired, total acres \| a					1,400
Certain Other Third Party Sites
Contingencies [Line Items]
Indemnification agreement with third party sites			11
Kleen Performance Products
Contingencies [Line Items]
Notices received from owners of third party sites seeking indemnification from the company			17
Federal and State Enforcement Actions
Contingencies [Line Items]
Recorded reserves for actual or probable liabilities \| $			$ 6,600,000					5,900,000
Number of pending personal injury claims allegedly resulting from the used of Safety-Kleen's products \| Proceedings			5
Minimum potential liability \| $			$ 100,000					$ 100,000

INCOME TAXES (Details)

INCOME TAXES (Details) $ in Millions	3 Months Ended		9 Months Ended
INCOME TAXES (Details) $ in Millions	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Dec. 31, 2014USD ($)
Income Tax Contingency [Line Items]
Effect tax rates	46.20%	55.60%	58.10%
Effective tax rate, pre tax income			0.444	0.473
Tax benefits	$ 2.2	$ 2.7	$ 2.2	$ 2.7	$ 2.5
Unrecognized tax benefits	0.4		0.4		$ 0.4
Foreign and State [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits that would impact effective tax rate	$ 0.5		$ 0.5

SEGMENT REPORTING (Narrative) (

SEGMENT REPORTING (Narrative) (Details)	9 Months Ended
SEGMENT REPORTING (Narrative) (Details)	Sep. 30, 2015segment
Segment Reporting [Abstract]
Number of reportable segments	6
Number of operations not managed by reportable segments	2

SEGMENT REPORTING (Third Party

SEGMENT REPORTING (Third Party Reveunes to Direct Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Total revenues	$ 893,366	$ 851,465	$ 2,562,093	$ 2,556,612
Third party revenues
Segment Reporting Information [Line Items]
Total revenues	893,366	851,465	2,562,093	2,556,612
Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	0	0	0	0
Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	0	0	0	0
Direct revenues
Segment Reporting Information [Line Items]
Total revenues	893,366	851,465	2,562,093	2,556,612
Technical Services \| Third party revenues
Segment Reporting Information [Line Items]
Total revenues	253,069	272,478	741,419	766,057
Technical Services \| Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	34,819	39,296	108,037	116,812
Technical Services \| Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	506	1,628	2,886	2,805
Technical Services \| Direct revenues
Segment Reporting Information [Line Items]
Total revenues	288,394	313,402	852,342	885,674
Industrial and Field Services \| Third party revenues
Segment Reporting Information [Line Items]
Total revenues	307,226	163,582	807,423	510,696
Industrial and Field Services \| Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(6,973)	(9,234)	(24,764)	(32,039)
Industrial and Field Services \| Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(313)	29	(636)	220
Industrial and Field Services \| Direct revenues
Segment Reporting Information [Line Items]
Total revenues	299,940	154,377	782,023	478,877
Kleen Performance Products \| Third party revenues
Segment Reporting Information [Line Items]
Total revenues	100,827	140,345	296,738	413,282
Kleen Performance Products \| Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(23,744)	(52,606)	(63,429)	(155,583)
Kleen Performance Products \| Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(6)	0	(8)	(5)
Kleen Performance Products \| Direct revenues
Segment Reporting Information [Line Items]
Total revenues	77,077	87,739	233,301	257,694
SK Environmental Services \| Third party revenues
Segment Reporting Information [Line Items]
Total revenues	171,832	170,980	508,392	503,692
SK Environmental Services \| Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(5,947)	21,212	(26,331)	64,476
SK Environmental Services \| Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	2	0	5	(58)
SK Environmental Services \| Direct revenues
Segment Reporting Information [Line Items]
Total revenues	165,887	192,192	482,066	568,110
Lodging Services \| Third party revenues
Segment Reporting Information [Line Items]
Total revenues	13,507	36,582	68,782	136,148
Lodging Services \| Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	743	697	1,899	1,991
Lodging Services \| Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	30	26	127	52
Lodging Services \| Direct revenues
Segment Reporting Information [Line Items]
Total revenues	14,280	37,305	70,808	138,191
Oil and Gas Field Services \| Third party revenues
Segment Reporting Information [Line Items]
Total revenues	46,788	67,370	138,992	226,319
Oil and Gas Field Services \| Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	1,102	635	4,588	4,343
Oil and Gas Field Services \| Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	92	4	141	(6)
Oil and Gas Field Services \| Direct revenues
Segment Reporting Information [Line Items]
Total revenues	47,982	68,009	143,721	230,656
Corporate Items \| Third party revenues
Segment Reporting Information [Line Items]
Total revenues	117	128	347	418
Corporate Items \| Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	0	0	0	0
Corporate Items \| Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(311)	(1,687)	(2,515)	(3,008)
Corporate Items \| Direct revenues
Segment Reporting Information [Line Items]
Total revenues	$ (194)	$ (1,559)	$ (2,168)	$ (2,590)

SEGMENT REPORTING (Adjusted EBI

SEGMENT REPORTING (Adjusted EBITDA Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	$ 165,607	$ 153,357	$ 407,006	$ 391,142
Accretion of environmental liabilities	2,577	2,642	7,795	7,975
Depreciation and amortization	69,060	70,049	205,189	205,480
Goodwill, Impairment Loss	0	(123,414)	(31,992)	(123,414)
Income (loss) from operations	93,970	(42,748)	162,030	54,273
Other expense (income)	139	(613)	390	(4,136)
Interest expense, net of interest income	19,017	19,494	57,704	58,430
Income (loss) before provision for income taxes	74,814	(61,629)	103,936	(21)
Technical Services
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	79,048	86,928	219,257	233,402
Industrial and Field Services
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	62,460	20,303	145,850	67,391
Kleen Performance Products
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	12,123	21,473	23,471	49,252
SK Environmental Services
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	40,096	30,853	108,540	84,985
Lodging Services
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	1,827	15,972	12,589	49,196
Oil and Gas Field Services
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	1,579	9,545	800	27,688
Goodwill, Impairment Loss			(31,992)
Corporate Items
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	$ (31,526)	$ (31,717)	$ (103,501)	$ (120,772)

SEGMENT REPORTING (Assets by Re

SEGMENT REPORTING (Assets by Reportable Segment) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 1,531,548		$ 1,558,834
Goodwill	447,918		452,669
Permits and other intangible, net	518,995		530,080
Total assets	3,599,861		3,704,278
Technical Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	464,705		412,323
Goodwill	49,426		50,092
Permits and other intangible, net	74,885		74,870
Total assets	806,451		756,169
Industrial and Field Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	242,007		245,115
Goodwill	106,043		109,214
Permits and other intangible, net	15,375		17,801
Total assets	392,284		392,652
Kleen Performance Products
Segment Reporting Information [Line Items]
Property, plant and equipment, net	193,576		201,451
Goodwill	49,972		50,883
Permits and other intangible, net	142,898		151,041
Total assets	497,627		538,921
SK Environmental Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	258,178		240,078
Goodwill	209,089		173,873
Permits and other intangible, net	260,327		252,897
Total assets	793,163		731,072
Lodging Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	112,708		141,965
Goodwill	33,388		34,863
Permits and other intangible, net	7,791		10,744
Total assets	187,461		231,782
Oil and Gas Field Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	168,630		215,574
Goodwill	0	$ 0	33,744
Permits and other intangible, net	17,719		22,727
Total assets	264,910		361,223
Corporate Items
Segment Reporting Information [Line Items]
Property, plant and equipment, net	91,744		102,328
Goodwill	0		0
Permits and other intangible, net	0		0
Total assets	$ 657,965		$ 692,459

SEGMENT REPORTING (Total Assets

SEGMENT REPORTING (Total Assets by Geographical Area) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 3,599,861	$ 3,704,278
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	2,681,409	2,572,494
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	914,690	1,128,458
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 3,762	$ 3,326

GUARANTOR AND NON-GUARANTOR S67

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
ASSETS
Cash and cash equivalents	$ 179,191	$ 246,879	$ 258,021	$ 310,073
Intercompany receivables	0	0
Accounts receivable, net	600,283	557,131
Other current assets	293,081	322,423
Property, plant and equipment, net	1,531,548	1,558,834
Investments in subsidiaries	0	0
Intercompany debt receivable	0	0
Goodwill	447,918	452,669
Permits and other intangibles, net	518,995	530,080
Other long-term assets	28,845	36,262
Total assets	3,599,861	3,704,278
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	625,016	572,471
Intercompany payables	0	0
Closure, post-closure and remedial liabilities, net	174,677	183,731
Long-term obligations	1,395,000	1,395,000
Intercompany debt payable	0	0
Other long-term liabilities	282,447	290,205
Total liabilities	2,477,140	2,441,407
Stockholders’ equity	1,122,721	1,262,871
Total liabilities and stockholders’ equity	3,599,861	3,704,278
Clean Harbors, Inc.
ASSETS
Cash and cash equivalents	11,008	1,006	1,006	1,006
Intercompany receivables	156,833	133,219
Accounts receivable, net	0	0
Other current assets	0	0
Property, plant and equipment, net	0	0
Investments in subsidiaries	2,566,095	2,694,727
Intercompany debt receivable	0	0
Goodwill	0	0
Permits and other intangibles, net	0	0
Other long-term assets	14,342	16,801
Total assets	2,748,278	2,845,753
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	18,558	20,820
Intercompany payables	208,298	163,361
Closure, post-closure and remedial liabilities, net	0	0
Long-term obligations	1,395,000	1,395,000
Intercompany debt payable	3,701	3,701
Other long-term liabilities	0	0
Total liabilities	1,625,557	1,582,882
Stockholders’ equity	1,122,721	1,262,871
Total liabilities and stockholders’ equity	2,748,278	2,845,753
U.S. Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	66,074	154,147	164,527	235,445
Intercompany receivables	210,159	156,920
Accounts receivable, net	493,459	414,205
Other current assets	220,901	241,232
Property, plant and equipment, net	1,056,190	970,757
Investments in subsidiaries	547,520	663,191
Intercompany debt receivable	285,385	327,634
Goodwill	359,068	324,930
Permits and other intangibles, net	441,639	435,906
Other long-term assets	9,039	12,959
Total assets	3,689,434	3,701,881
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	523,971	444,059
Intercompany payables	187,406	164,231
Closure, post-closure and remedial liabilities, net	155,386	158,622
Long-term obligations	0	0
Intercompany debt payable	0	0
Other long-term liabilities	256,576	240,242
Total liabilities	1,123,339	1,007,154
Stockholders’ equity	2,566,095	2,694,727
Total liabilities and stockholders’ equity	3,689,434	3,701,881
Foreign Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	102,109	91,726	$ 92,488	$ 73,622
Intercompany receivables	30,572	39,724
Accounts receivable, net	106,824	142,926
Other current assets	72,180	81,191
Property, plant and equipment, net	475,358	588,077
Investments in subsidiaries	0	0
Intercompany debt receivable	3,701	3,701
Goodwill	88,850	127,739
Permits and other intangibles, net	77,356	94,174
Other long-term assets	5,464	6,502
Total assets	962,414	1,175,760
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	82,487	107,592
Intercompany payables	1,860	2,271
Closure, post-closure and remedial liabilities, net	19,291	25,109
Long-term obligations	0	0
Intercompany debt payable	285,385	327,634
Other long-term liabilities	25,871	49,963
Total liabilities	414,894	512,569
Stockholders’ equity	547,520	663,191
Total liabilities and stockholders’ equity	962,414	1,175,760
Consolidating Adjustments
ASSETS
Cash and cash equivalents	0	0
Intercompany receivables	(397,564)	(329,863)
Accounts receivable, net	0	0
Other current assets	0	0
Property, plant and equipment, net	0	0
Investments in subsidiaries	(3,113,615)	(3,357,918)
Intercompany debt receivable	(289,086)	(331,335)
Goodwill	0	0
Permits and other intangibles, net	0	0
Other long-term assets	0	0
Total assets	(3,800,265)	(4,019,116)
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	0	0
Intercompany payables	(397,564)	(329,863)
Closure, post-closure and remedial liabilities, net	0	0
Long-term obligations	0	0
Intercompany debt payable	(289,086)	(331,335)
Other long-term liabilities	0	0
Total liabilities	(686,650)	(661,198)
Stockholders’ equity	(3,113,615)	(3,357,918)
Total liabilities and stockholders’ equity	$ (3,800,265)	$ (4,019,116)

GUARANTOR AND NON-GUARANTOR S68

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Statements of (Loss) Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues:
Service revenues	$ 760,667	$ 657,221	$ 2,158,344	$ 1,962,071
Product revenues	132,699	194,244	403,749	594,541
Total revenues	893,366	851,465	2,562,093	2,556,612
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	523,676	440,261	1,484,936	1,333,443
Product cost of revenues	110,970	158,146	348,905	497,633
Total cost of revenues	634,646	598,407	1,833,841	1,831,076
Selling, general and administrative expenses	93,113	99,701	321,246	334,394
Accretion of environmental liabilities	2,577	2,642	7,795	7,975
Depreciation and amortization	69,060	70,049	205,189	205,480
Goodwill impairment charge	0	123,414	31,992	123,414
Income (loss) from operations	93,970	(42,748)	162,030	54,273
Other (expense) income	(139)	613	(390)	4,136
Interest (expense) income	(19,017)	(19,494)	(57,704)	(58,430)
Equity in earnings of subsidiaries, net of taxes	0	0	0	0
Net Dividend Income from Affiliates Subsidiaries and Holding Company				0
Intercompany interest income (expense)	0	0	0	0
Income (loss) before provision for income taxes	74,814	(61,629)	103,936	(21)
(Benefit) provision for income taxes	34,586	31,708	60,402	55,684
Net income (loss)	40,228	(93,337)	43,534	(55,705)
Other comprehensive loss	(53,541)	(49,092)	(118,713)	(54,561)
Comprehensive loss	(13,313)	(142,429)	(75,179)	(110,266)
Clean Harbors, Inc.
Revenues:
Service revenues	0	0	0	0
Product revenues	0	0	0	0
Total revenues	0	0	0	0
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	0	0	0	0
Product cost of revenues	0	0	0	0
Total cost of revenues	0	0	0	0
Selling, general and administrative expenses	25	25	75	82
Accretion of environmental liabilities	0	0	0	0
Depreciation and amortization	0	0	0	0
Goodwill impairment charge	0	0	0	0
Income (loss) from operations	(25)	(25)	(75)	(82)
Other (expense) income	0	0	0	0
Interest (expense) income	(19,671)	(19,622)	(58,962)	(58,968)
Equity in earnings of subsidiaries, net of taxes	52,046	(81,549)	78,956	(20,275)
Net Dividend Income from Affiliates Subsidiaries and Holding Company				0
Intercompany interest income (expense)	0	0	0	0
Income (loss) before provision for income taxes	32,350	(101,196)	19,919	(79,325)
(Benefit) provision for income taxes	(7,878)	(7,859)	(23,615)	(23,620)
Net income (loss)	40,228	(93,337)	43,534	(55,705)
Other comprehensive loss	(53,541)	(49,092)	(118,713)	(54,561)
Comprehensive loss	(13,313)	(142,429)	(75,179)	(110,266)
U.S. Guarantor Subsidiaries
Revenues:
Service revenues	612,814	420,906	1,659,739	1,325,266
Product revenues	117,653	167,492	349,524	475,429
Total revenues	730,467	588,398	2,009,263	1,800,695
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	413,878	265,940	1,106,591	872,999
Product cost of revenues	101,778	149,270	315,322	403,007
Total cost of revenues	515,656	415,210	1,421,913	1,276,006
Selling, general and administrative expenses	72,811	71,139	247,472	241,317
Accretion of environmental liabilities	2,277	2,295	6,870	6,931
Depreciation and amortization	46,951	44,305	137,354	128,496
Goodwill impairment charge	0	105,466	4,164	105,466
Income (loss) from operations	92,772	(50,017)	191,490	42,479
Other (expense) income	204	2,592	483	2,716
Interest (expense) income	613	85	1,115	537
Equity in earnings of subsidiaries, net of taxes	(2,341)	(7,361)	(38,920)	(13,525)
Net Dividend Income from Affiliates Subsidiaries and Holding Company				0
Intercompany interest income (expense)	5,666	6,148	17,679	24,368
Income (loss) before provision for income taxes	96,914	(48,553)	171,847	56,575
(Benefit) provision for income taxes	44,868	32,996	92,891	76,850
Net income (loss)	52,046	(81,549)	78,956	(20,275)
Other comprehensive loss	(53,541)	(49,092)	(118,713)	(54,561)
Comprehensive loss	(1,495)	(130,641)	(39,757)	(74,836)
Foreign Non-Guarantor Subsidiaries
Revenues:
Service revenues	162,680	235,569	546,790	647,469
Product revenues	17,591	26,713	63,239	122,343
Total revenues	180,271	262,282	610,029	769,812
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	124,625	173,575	426,530	471,108
Product cost of revenues	11,737	8,837	42,597	97,857
Total cost of revenues	136,362	182,412	469,127	568,965
Selling, general and administrative expenses	20,277	28,537	73,699	92,995
Accretion of environmental liabilities	300	347	925	1,044
Depreciation and amortization	22,109	25,744	67,835	76,984
Goodwill impairment charge	0	17,948	27,828	17,948
Income (loss) from operations	1,223	7,294	(29,385)	11,876
Other (expense) income	(343)	(1,979)	(873)	1,420
Interest (expense) income	41	43	143	1
Equity in earnings of subsidiaries, net of taxes	0	0	0	0
Net Dividend Income from Affiliates Subsidiaries and Holding Company				6,238
Intercompany interest income (expense)	(5,666)	(6,148)	(17,679)	(24,368)
Income (loss) before provision for income taxes	(4,745)	(790)	(47,794)	(4,833)
(Benefit) provision for income taxes	(2,404)	6,571	(8,874)	2,454
Net income (loss)	(2,341)	(7,361)	(38,920)	(7,287)
Other comprehensive loss	(34,150)	32,335	(76,752)	9,090
Comprehensive loss	(36,491)	24,974	(115,672)	1,803
Consolidating Adjustments
Revenues:
Service revenues	(14,827)	746	(48,185)	(10,664)
Product revenues	(2,545)	39	(9,014)	(3,231)
Total revenues	(17,372)	785	(57,199)	(13,895)
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	(14,827)	746	(48,185)	(10,664)
Product cost of revenues	(2,545)	39	(9,014)	(3,231)
Total cost of revenues	(17,372)	785	(57,199)	(13,895)
Selling, general and administrative expenses	0	0	0	0
Accretion of environmental liabilities	0	0	0	0
Depreciation and amortization	0	0	0	0
Goodwill impairment charge	0	0	0	0
Income (loss) from operations	0	0	0	0
Other (expense) income	0	0	0	0
Interest (expense) income	0	0	0	0
Equity in earnings of subsidiaries, net of taxes	(49,705)	88,910	(40,036)	33,800
Net Dividend Income from Affiliates Subsidiaries and Holding Company				(6,238)
Intercompany interest income (expense)	0	0	0	0
Income (loss) before provision for income taxes	(49,705)	88,910	(40,036)	27,562
(Benefit) provision for income taxes	0	0		0
Net income (loss)	(49,705)	88,910	(40,036)	27,562
Other comprehensive loss	87,691	16,757	195,465	45,471
Comprehensive loss	$ 37,986	$ 105,667	$ 155,429	$ 73,033

GUARANTOR AND NON-GUARANTOR S69

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Condensed consolidating statement of cash flows
Net cash from operating activities		$ 309,593	$ 196,039
Cash flows from investing activities:
Additions to property, plant and equipment		(189,999)	(198,877)
Proceeds from sales of fixed assets		3,740	5,913
Acquisitions, net of cash acquired		(79,610)	(6,150)
Costs to obtain or renew permits		(4,633)	(5,443)
Proceeds from sale of long term investments			12,947
Intercompany		0	0
Proceeds from Insurance Settlement	$ 914
Net cash used in investing activities		(270,502)	(190,696)
Cash flows from financing activities:
Change in uncashed checks		(21,882)	(591)
Proceeds from exercise of stock options		397	0
Proceeds from employee stock purchase plan		0	4,364
Issuance of restricted shares, net of shares remitted		(2,027)	(2,668)
Repurchases of common stock		(69,155)	(48,329)
Excess tax benefit of stock-based compensation		102	829
Repayment of long-term obligations		0	(5,000)
Payments on capital leases		(500)	(1,682)
Dividends paid			0
Intercompany		0	0
Net cash from financing activities		(93,065)	(53,077)
Effect of exchange rate change on cash		(13,714)	(4,318)
Decrease in cash and cash equivalents		(67,688)	(52,052)
Cash and cash equivalents, beginning of period		246,879	310,073
Cash and cash equivalents, end of period	258,021	179,191	258,021
Clean Harbors, Inc.
Condensed consolidating statement of cash flows
Net cash from operating activities		9,503	(5,193)
Cash flows from investing activities:
Additions to property, plant and equipment		0	0
Proceeds from sales of fixed assets		0	0
Acquisitions, net of cash acquired		0	0
Costs to obtain or renew permits		0	0
Proceeds from sale of long term investments			0
Intercompany		0	0
Proceeds from Insurance Settlement			0
Net cash used in investing activities		0	0
Cash flows from financing activities:
Change in uncashed checks		0	0
Proceeds from exercise of stock options		397
Proceeds from employee stock purchase plan			4,364
Issuance of restricted shares, net of shares remitted		(2,027)	(2,668)
Repurchases of common stock		(69,155)	(48,329)
Excess tax benefit of stock-based compensation		102	829
Repayment of long-term obligations			(5,000)
Payments on capital leases		0	0
Dividends paid			0
Intercompany		71,182	55,997
Net cash from financing activities		499	5,193
Effect of exchange rate change on cash		0	0
Decrease in cash and cash equivalents		10,002	0
Cash and cash equivalents, beginning of period		1,006	1,006
Cash and cash equivalents, end of period	1,006	11,008	1,006
U.S. Guarantor Subsidiaries
Condensed consolidating statement of cash flows
Net cash from operating activities		240,713	139,640
Cash flows from investing activities:
Additions to property, plant and equipment		(162,329)	(133,320)
Proceeds from sales of fixed assets		1,177	3,634
Acquisitions, net of cash acquired		(79,610)	(6,150)
Costs to obtain or renew permits		(4)	(589)
Proceeds from sale of long term investments			0
Intercompany		(71,182)	(55,997)
Proceeds from Insurance Settlement			0
Net cash used in investing activities		(311,948)	(192,422)
Cash flows from financing activities:
Change in uncashed checks		(16,635)	579
Proceeds from exercise of stock options		0
Proceeds from employee stock purchase plan			0
Issuance of restricted shares, net of shares remitted		0	0
Repurchases of common stock		0	0
Excess tax benefit of stock-based compensation		0	0
Repayment of long-term obligations			0
Payments on capital leases		(203)	(129)
Dividends paid			(18,586)
Intercompany		0	0
Net cash from financing activities		(16,838)	(18,136)
Effect of exchange rate change on cash		0	0
Decrease in cash and cash equivalents		(88,073)	(70,918)
Cash and cash equivalents, beginning of period		154,147	235,445
Cash and cash equivalents, end of period	164,527	66,074	164,527
Foreign Non-Guarantor Subsidiaries
Condensed consolidating statement of cash flows
Net cash from operating activities		59,377	80,178
Cash flows from investing activities:
Additions to property, plant and equipment		(27,670)	(65,557)
Proceeds from sales of fixed assets		2,563	2,279
Acquisitions, net of cash acquired		0	0
Costs to obtain or renew permits		$ (4,629)	(4,854)
Proceeds from sale of long term investments			12,947
Intercompany			0
Proceeds from Insurance Settlement			914
Net cash used in investing activities		$ (29,736)	(54,271)
Cash flows from financing activities:
Change in uncashed checks		(5,247)	(1,170)
Proceeds from exercise of stock options		0
Proceeds from employee stock purchase plan			0
Issuance of restricted shares, net of shares remitted		0	0
Repurchases of common stock		0	0
Excess tax benefit of stock-based compensation		0	0
Repayment of long-term obligations			0
Payments on capital leases		(297)	(1,553)
Dividends paid			0
Intercompany		0	0
Net cash from financing activities		(5,544)	(2,723)
Effect of exchange rate change on cash		(13,714)	(4,318)
Decrease in cash and cash equivalents		10,383	18,866
Cash and cash equivalents, beginning of period		91,726	73,622
Cash and cash equivalents, end of period	$ 92,488	102,109	92,488
Consolidating Adjustments
Condensed consolidating statement of cash flows
Net cash from operating activities			(18,586)
Cash flows from investing activities:
Intercompany		(71,182)	55,997
Net cash used in investing activities		71,182	55,997
Cash flows from financing activities:
Dividends paid			18,586
Intercompany		(71,182)	(55,997)
Net cash from financing activities		$ (71,182)	$ (37,411)