10-Q

UNITED STATES OF AMERICA

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

_______________________

FORM 10-Q

x	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2015
OR
o	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE TRANSITION PERIOD FROM         TO       

Commission File Number 001-34223

_______________________

CLEAN HARBORS, INC.

(Exact name of registrant as specified in its charter)

Massachusetts	04-2997780
(State or Other Jurisdiction of Incorporation or Organization)	(IRS Employer Identification No.)
42 Longwater Drive, Norwell, MA	02061-9149
(Address of Principal Executive Offices)	(Zip Code)

(781) 792-5000

(Registrant’s Telephone Number, Including area code)

_______________________

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has been subject to such filing requirements for the past 90 days. Yes x  No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes  x  No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer,” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer x	Accelerated filer o
Non-accelerated filer o	Smaller reporting company o
(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined by Rule 12b-2 of the Exchange Act). Yes o  No x

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Common Stock, $.01 par value	58,666,636
(Class)	(Outstanding as of May 1, 2015)

CLEAN HARBORS, INC.

QUARTERLY REPORT ON FORM 10-Q

TABLE OF CONTENTS

	Page No.
PART I: FINANCIAL INFORMATION
ITEM 1: Unaudited Financial Statements
Consolidated Balance Sheets	1
Unaudited Consolidated Statements of (Loss) Income	2
Unaudited Consolidated Statements of Comprehensive Loss	3
Unaudited Consolidated Statements of Cash Flows	4
Unaudited Consolidated Statements of Stockholders’ Equity	5
Notes to Unaudited Consolidated Financial Statements	6
ITEM 2: Management’s Discussion and Analysis of Financial Condition and Results of Operations	24
ITEM 3: Quantitative and Qualitative Disclosures About Market Risk	31
ITEM 4: Controls and Procedures	31
PART II: OTHER INFORMATION
ITEM 1: Legal Proceedings	32
ITEM 1A: Risk Factors	32
ITEM 2: Unregistered Sales of Equity Securities and Use of Proceeds	32
ITEM 3: Defaults Upon Senior Securities	32
ITEM 4: Mine Safety Disclosures	32
ITEM 5: Other Information	32
ITEM 6: Exhibits	33
Signatures	34

CLEAN HARBORS, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(in thousands)

	March 31, 2015			December 31, 2014
ASSETS	(unaudited)
Current assets:
Cash and cash equivalents	$	233,739		$	246,879
Accounts receivable, net of allowances aggregating $26,358 and $25,661, respectively	521,563			557,131
Unbilled accounts receivable	33,333			40,775
Deferred costs	18,880			19,018
Inventories and supplies	143,052			168,663
Prepaid expenses and other current assets	56,263			57,435
Deferred tax assets	36,355			36,532
Total current assets	1,043,185			1,126,433
Property, plant and equipment, net	1,502,497			1,558,834
Other assets:
Deferred financing costs	16,761			17,580
Goodwill	445,412			452,669
Permits and other intangibles, net	520,045			530,080
Other	18,142			18,682
Total other assets	1,000,360			1,019,011
Total assets	$	3,546,042		$	3,704,278
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Current portion of capital lease obligations	$	116		$	536
Accounts payable	244,216			267,329
Deferred revenue	62,677			62,966
Accrued expenses	187,728			219,549
Current portion of closure, post-closure and remedial liabilities	25,124			22,091
Total current liabilities	519,861			572,471
Other liabilities:
Closure and post-closure liabilities, less current portion of $8,272 and $4,999, respectively	42,848			45,702
Remedial liabilities, less current portion of $16,852 and $17,092, respectively	132,893			138,029
Long-term obligations	1,395,000			1,395,000
Deferred taxes, unrecognized tax benefits and other long-term liabilities	292,591			290,205
Total other liabilities	1,863,332			1,868,936
Commitments and contingent liabilities (See Note 15)
Stockholders’ equity:
Common stock, $.01 par value:
Authorized 80,000,000; shares issued and outstanding 58,661,384 and 58,903,482  shares, respectively	587			589
Shares held under employee participation plan	(469		)	(469		)
Additional paid-in capital	789,501			805,029
Accumulated other comprehensive loss	(188,245		)	(110,842		)
Accumulated earnings	561,475			568,564
Total stockholders’ equity	1,162,849			1,262,871
Total liabilities and stockholders’ equity	$	3,546,042		$	3,704,278

The accompanying notes are an integral part of these unaudited consolidated financial statements.

1

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF (LOSS) INCOME

(in thousands except per share amounts)

	Three Months Ended
	March 31,
	2015			2014
Revenues:
Service revenues	$	596,330		$	660,095
Product revenues	136,169			186,572
Total revenues	732,499			846,667
Cost of revenues (exclusive of items shown separately below)
Service revenues	416,390			466,799
Product revenues	130,117			158,920
Total cost of revenues	546,507			625,719
Selling, general and administrative expenses	107,715			118,962
Accretion of environmental liabilities	2,619			2,724
Depreciation and amortization	68,356			69,356
Income from operations	7,302			29,906
Other income	409			4,178
Interest expense, net of interest income of $151 and $205, respectively	(19,438		)	(19,554		)
(Loss) income before (benefit) provision for income taxes	(11,727		)	14,530
(Benefit) provision for income taxes	(4,638		)	5,570
Net (loss) income	$	(7,089	)	$	8,960
(Loss) earnings per share:
Basic	$	(0.12	)	$	0.15
Diluted	$	(0.12	)	$	0.15
Shares used to compute (loss) earnings per share - Basic	58,875			60,720
Shares used to compute (loss) earnings per share - Diluted	58,875			60,861

The accompanying notes are an integral part of these unaudited consolidated financial statements.

2

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS

(in thousands)

	Three Months Ended
	March 31,
	2015			2014
Net (loss) income	$	(7,089	)	$	8,960
Other comprehensive loss:
Unrealized gains on available-for-sale securities (net of taxes of $0, $152)	—			860
Reclassification adjustment for gains on available-for-sale securities included in net (loss) income (net of taxes of $0, $496)	—			(2,812		)
Foreign currency translation adjustments	(77,403		)	(39,573		)
Other comprehensive loss	(77,403		)	(41,525		)
Comprehensive loss	$	(84,492	)	$	(32,565	)

The accompanying notes are an integral part of these unaudited consolidated financial statements.

3

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	Three Months Ended
	March 31,
	2015			2014
Cash flows from operating activities:
Net (loss) income	$	(7,089	)	$	8,960
Adjustments to reconcile net (loss) income to net cash from operating activities:
Depreciation and amortization	68,356			69,356
Allowance for doubtful accounts	2,204			2,086
Amortization of deferred financing costs and debt discount	819			824
Accretion of environmental liabilities	2,619			2,724
Changes in environmental liability estimates	385			(821		)
Deferred income taxes	(903		)	—
Stock-based compensation	1,850			2,278
Excess tax benefit of stock-based compensation	(5		)	(117		)
Net tax benefit on stock based awards	(111		)	117
Other income	(409		)	(4,178		)
Environmental expenditures	(5,604		)	(4,186		)
Changes in assets and liabilities, net of acquisitions
Accounts receivable and unbilled accounts receivable	27,065			(11,069		)
Inventories and supplies	22,131			(1,709		)
Other current assets	374			(15,722		)
Accounts payable	2,623			(23,374		)
Other current and long-term liabilities	(29,528		)	(20,573		)
Net cash from operating activities	84,777			4,596
Cash flows from investing activities:
Additions to property, plant and equipment	(52,949		)	(75,005		)
Proceeds from sales of fixed assets	760			876
Proceeds from sales of marketable securities	—			12,870
Additions to intangible assets, including costs to obtain or renew permits	(1,171		)	(1,075		)
Net cash used in investing activities	(53,360		)	(62,334		)
Cash flows from financing activities:
Change in uncashed checks	(20,268		)	21
Issuance of restricted shares, net of shares remitted	(1,154		)	(750		)
Repurchases of common stock	(15,379		)	(1,225		)
Proceeds from employee stock purchase plan	—			2,141
Payments on capital leases	(398		)	(638		)
Excess tax benefit of stock-based compensation	5			117
Net cash from financing activities	(37,194		)	(334		)
Effect of exchange rate change on cash	(7,363		)	(2,994		)
Decrease in cash and cash equivalents	(13,140		)	(61,066		)
Cash and cash equivalents, beginning of period	246,879			310,073
Cash and cash equivalents, end of period	$	233,739		$	249,007
Supplemental information:
Cash payments for interest and income taxes:
Interest paid	$	21,667		$	21,436
Income taxes (received) paid	(3,790		)	5,389
Non-cash investing and financing activities:
Accrual for repurchased shares	736			—
Property, plant and equipment accrued	22,832			26,715

The accompanying notes are an integral part of these unaudited consolidated financial statements.

4

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(in thousands)

	Common Stock					Shares Held Under Employee Participation Plan						Accumulated Other Comprehensive Loss
	Number of Shares		$ 0.01 Par Value						Additional Paid-in Capital						Accumulated Earnings			Total Stockholders’ Equity
Balance at January 1, 2015	58,903		$	589		$	(469	)	$	805,029		$	(110,842	)	$	568,564		$	1,262,871
Net loss	—		—			—			—			—			(7,089		)	(7,089		)
Other comprehensive loss	—		—			—			—			(77,403		)	—			(77,403		)
Stock-based compensation	—		—			—			1,850			—			—			1,850
Issuance of restricted shares, net of shares remitted	44		1			—			(1,155		)	—			—			(1,154		)
Repurchases of common stock	(286	)	(3		)	—			(16,112		)	—			—			(16,115		)
Net tax benefit on stock-based awards	—		—			—			(111		)	—			—			(111		)
Balance at March 31, 2015	58,661		$	587		$	(469	)	$	789,501		$	(188,245	)	$	561,475		$	1,162,849

The accompanying notes are an integral part of these unaudited consolidated financial statements.

5

CLEAN HARBORS, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(1) 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.

Reclassifications

During the second quarter of 2014, the Company made changes to the manner in which it manages the business, makes operating decisions and assesses performance. These changes included the reassignment of certain departments among the Company's operating segments in line with management reporting changes as well as the identification of Lodging Services as an additional segment. Under the new structure, the Company's operations are managed in six reportable segments: Technical Services, Industrial and Field Services, Oil Re-refining and Recycling, SK Environmental Services, Lodging Services and Oil and Gas Field Services. The amounts presented for all periods herein have been recast to reflect the impact of such changes. These reclassifications and adjustments had no effect on consolidated net income, comprehensive income, cash flows or stockholders' equity for any of the periods presented.

During the third quarter of 2014, the Company aggregated the cash flow effects of the change in unbilled receivables with the change from accounts receivable in the Consolidated Statements of Cash Flows. Previously the cash flow effect of the change in unbilled receivables was aggregated with changes in other current assets. Prior year amounts have been recast to conform to the current year presentation.

(2) 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. This new guidance is currently effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2016.

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.

6

In April 2015, FASB issued ASU 2015-03, Interest - Imputation of Interest (Subtopic 835-30). The amendment provides guidance regarding the simplification of the presentation of debt issuance costs. 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 standard to be implemented will have on the Company's consolidated financial statements.

(3) BUSINESS COMBINATIONS

2015 Acquisitions

On April 11, 2015, the Company acquired Thermo Fluids Inc. for a preliminary purchase price of $85.0 million in cash, subject to customary post-closing adjustments based upon finalized working capital amounts.

2014 Acquisitions

In 2014, the Company acquired the assets of two privately owned companies for approximately $16.1 million in cash, net of cash acquired. The purchase prices are subject to customary post-closing adjustments based upon finalized working capital amounts. The acquired companies have been integrated into the Technical Services and Lodging Services segments.

(4) INVENTORIES AND SUPPLIES

Inventories and supplies consisted of the following (in thousands):

	March 31, 2015		December 31, 2014
Oil and oil products	$	37,785	$	62,111
Supplies and drums	66,487		68,547
Solvent and solutions	9,627		9,355
Modular camp accommodations	15,441		15,776
Other	13,712		12,874
Total inventories and supplies	$	143,052	$	168,663

As of March 31, 2015 and December 31, 2014, other inventories consist primarily of cleaning fluids, such as absorbents and wipers, and automotive fluids, such as windshield washer fluid and antifreeze.

(5) PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consisted of the following (in thousands):

	March 31, 2015		December 31, 2014
Land	$	97,742	$	98,507
Asset retirement costs (non-landfill)	10,812		10,871
Landfill assets	116,889		110,984
Buildings and improvements	334,282		338,242
Camp equipment	163,434		180,575
Vehicles	468,862		471,615
Equipment	1,283,502		1,302,424
Furniture and fixtures	5,379		5,517
Construction in progress	53,086		45,605
	2,533,988		2,564,340
Less - accumulated depreciation and amortization	1,031,491		1,005,506
Total property, plant and equipment, net	$	1,502,497	$	1,558,834

Interest in the amount of $0.2 million and $22.0 thousand was capitalized to fixed assets during the three months ended March 31, 2015 and March 31, 2014, respectively. Depreciation expense, inclusive of landfill amortization was $57.4 million and $59.9 million for the three months ended March 31, 2015 and March 31, 2014, respectively.

7

(6) GOODWILL AND OTHER INTANGIBLE ASSETS

The changes to goodwill for the three months ended March 31, 2015 were as follows (in thousands):

	2015
Balance at January 1, 2015	$	452,669
Increase from adjustments during the measurement period related to recent acquisitions	3,841
Foreign currency translation	(11,098		)
Balance at March 31, 2015	$	445,412

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 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. As a result of continued lower operating results caused by the depressed economic conditions and lower levels of activity in the Oil and Gas industry primarily in Western Canada, the Company continues to monitor the goodwill in this reporting unit for impairment. During the quarter ended March 31, 2015, the Company evaluated the reporting unit’s performance along with other business specific, and macroeconomic and industry factors. The Company concluded that as of March 31, 2015, no events or changes in circumstances have arisen which would indicate that the fair value of this reporting unit has more likely than not been reduced below its carrying amount. If the Oil & Gas Field Services reporting unit does not achieve the financial performance that the Company expects, it is reasonably possible that an impairment of goodwill may result.  

Below is a summary of amortizable other intangible assets (in thousands):

	March 31, 2015							December 31, 2014
	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)
Permits	$	161,941	$	58,028	$	103,913	18.8	$	156,692	$	55,318	$	101,374	19.0
Customer and supplier relationships	363,681		81,563		282,118		10.9	370,373		77,697		292,676		11.0
Other intangible assets	30,477		19,081		11,396		2.8	31,540		19,074		12,466		3.2
Total amortizable permits and other intangible assets	556,099		158,672		397,427		11.2	558,605		152,089		406,516		11.4
Trademarks and trade names	122,618		—		122,618		Indefinite	123,564		—		123,564		Indefinite
Total permits and other intangible assets	$	678,717	$	158,672	$	520,045		$	682,169	$	152,089	$	530,080

Amortization expense of permits and other intangible assets for the three months ended March 31, 2015 and March 31, 2014 was $11.0 million and $9.5 million, respectively.

8

Below is the expected future amortization of the net carrying amount of finite-lived intangible assets at March 31, 2015 (in thousands):

Years Ending December 31,	Expected Amortization
2015 (nine months)	$	26,237
2016	34,583
2017	32,437
2018	29,739
2019	26,426
Thereafter	248,005
	$	397,427

(7) ACCRUED EXPENSES

Accrued expenses consisted of the following (in thousands):

	March 31, 2015		December 31, 2014
Insurance	$	56,992	$	58,931
Interest	17,630		20,527
Accrued compensation and benefits	39,346		59,006
Income, real estate, sales and other taxes	29,872		38,297
Other	43,888		42,788
Total accrued expenses	$	187,728	$	219,549

(8) CLOSURE AND POST-CLOSURE LIABILITIES

The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) for the three months ended March 31, 2015 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2015	$	29,932		$	20,769		$	50,701
New asset retirement obligations	753			—			753
Accretion	682			496			1,178
Changes in estimates recorded to statement of income	—			(24		)	(24		)
Changes in estimates recorded to balance sheet	(932		)	—			(932		)
Expenditures	(246		)	(19		)	(265		)
Currency translation and other	(196		)	(95		)	(291		)
Balance at March 31, 2015	$	29,993		$	21,127		$	51,120

All of the landfill facilities included in the above were active as of March 31, 2015. New asset retirement obligations incurred during the first three 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.

9

(9) REMEDIAL LIABILITIES

The changes to remedial liabilities for the three months ended March 31, 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	63			718			660			1,441
Changes in estimates recorded to statement of income	(124		)	27			506			409
Expenditures	(16		)	(1,045		)	(4,278		)	(5,339		)
Currency translation and other	(220		)	(92		)	(1,575		)	(1,887		)
Balance at March 31, 2015	$	5,123		$	68,136		$	76,486		$	149,745

In the three months ended March 31, 2015 there were no significant charges (benefits) resulting from changes in estimates for remedial liabilities.

(10) FINANCING ARRANGEMENTS

The following table is a summary of the Company’s financing arrangements (in thousands):

	March 31, 2015		December 31, 2014
Senior unsecured notes, at 5.25%, due August 1, 2020	$	800,000	$	800,000
Senior unsecured notes, at 5.125%, due June 1, 2021	595,000		595,000
Long-term obligations	$	1,395,000	$	1,395,000

On July 30, 2012, the Company issued through a private placement $800.0 million aggregate principal amount of 5.25% senior unsecured notes due August 1, 2020 ("2020 Notes") with semi-annually fixed interest payments on February 1 and August 1 of each year, which commenced on February 1, 2013. At March 31, 2015 and December 31, 2014, the fair value of the Company's 2020 Notes was $818.0 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.

On December 7, 2012, the Company issued through a private placement $600.0 million aggregate principal amount of 5.125% senior unsecured notes due 2021 ("2021 Notes") with semi-annually fixed interest payments on June 1 and December 1 of each year, which commenced on June 1, 2013. At March 31, 2015 and December 31, 2014, the fair value of the Company's 2021 Notes was $606.9 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 March 31, 2015 and December 31, 2014 had no outstanding loan balances. At March 31, 2015, $209.6 million was available to borrow and outstanding letters of credit were $140.7 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. and its domestic subsidiaries is subject 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 subject 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.

(11) INCOME TAXES

The Company’s effective tax rate for the three months ended March 31, 2015 was 39.5% compared to 38.3% for the same period in 2014. The increase in the effective rates for the three months ended March 31, 2015 is primarily due to the benefit realized from the release of an uncertain tax position that was recorded in the first quarter of 2015.

As of March 31, 2015 and December 31, 2014, the Company had recorded $2.3 million and $2.5 million, respectively, of liabilities for unrecognized tax benefits and $0.4 million of interest, respectively.

10

Due to expiring statute of limitation periods, the Company believes that total unrecognized tax benefits will decrease by approximately $0.6 million within the next 12 months. This is the result of an audit settlement for one of our foreign entities.

(12) (LOSS) EARNINGS PER SHARE

The following are computations of basic and diluted (loss) earnings per share (in thousands except for per share amounts):

	Three Months Ended
	March 31,
	2015			2014
Numerator for basic and diluted (loss) earnings per share:
Net (loss) income	$	(7,089	)	$	8,960
Denominator:
Basic shares outstanding	58,875			60,720
Dilutive effect of equity-based compensation awards	—			141
Dilutive shares outstanding	58,875			60,861
Basic (loss) earnings per share:	$	(0.12	)	$	0.15
Diluted (loss) earnings per share:	$	(0.12	)	$	0.15

As a result of the net loss reported for the three months ended March 31, 2015, all outstanding stock options, restricted stock awards and performance awards totaling 539,983 were excluded from the calculation of diluted earnings per share as their inclusion would have an antidilutive effect. For the three months ended March 31, 2014, the dilutive effect of all then outstanding options, restricted stock and performance awards is included in the EPS calculations above except for 101,059 of outstanding performance stock awards for which the performance criteria were not attained at that time.

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(13) ACCUMULATED OTHER COMPREHENSIVE LOSS

The changes in accumulated other comprehensive loss by component and related tax effects for the three months ended March 31, 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	(77,403		)	—			(77,403		)
Other comprehensive loss	$	(77,403	)	$	—		$	(77,403	)
Balance at March 31, 2015	$	(186,292	)	$	(1,953	)	$	(188,245	)

The amounts reclassified out of accumulated other comprehensive loss into the consolidated statement of income, with presentation location during the three months ended March 31, 2015 and March 31, 2014, were as follows (in thousands):

	For the Three Months Ended
Comprehensive Loss Components	March 31, 2015		March 31, 2014			Location
Unrealized gains on available-for-sale investments	$	—	$	(3,308	)	Other income

(14) STOCK-BASED COMPENSATION

Total stock-based compensation cost charged to selling, general and administrative expenses for the three months ended March 31, 2015 and March 31, 2014 was $1.8 million and $2.3 million, respectively. The total income tax benefit recognized in the consolidated statements of income from stock-based compensation was $0.5 million and $0.4 million for the three months ended March 31, 2015 and March 31, 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 three months ended March 31, 2015:

Restricted Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Unvested January 1, 2015	383,021		$	56.51
Granted	58,125		$	53.72
Vested	(59,266	)	$	59.25
Forfeited	(12,349	)	$	56.64
Unvested March 31, 2015	369,531		$	55.63

As of March 31, 2015, there was $14.0 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 3.1 years. The total fair value of restricted stock vested during the three months ended March 31, 2015 and March 31, 2014 was $3.2 million and $2.3 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

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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 three months ended March 31, 2015:

Performance Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Unvested January 1, 2015	143,875		$	60.94
Vested	(6,129	)	$	54.28
Forfeited	(3,294	)	$	61.04
Unvested March 31, 2015	134,452		$	61.25

As of March 31, 2015, there was $0.3 million of total unrecognized compensation cost arising from non-vested performance stock awards deemed probable of vesting under the Company's Plans. The total fair value of performance awards vested during the three months ended March 31, 2015 was $0.3 million. No performance awards vested during the three months ended March 31, 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. As of March 31, 2015, we had repurchased and retired a total of approximately 2.3 million shares of our common stock for approximately $120.5 million under this program. As of March 31, 2015, an additional $179.5 million remains available for repurchase of shares under the current authorized program.

(15) 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 March 31, 2015 and December 31, 2014, the Company had recorded reserves of $29.8 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 March 31, 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 $2.5 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 March 31, 2015 and December 31, 2014, the $29.8 million and $33.6 million, respectively, of reserves consisted of (i) $24.1 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) $5.7 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 March 31, 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

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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 March 31, 2015 and December 31, 2014, the Company had accrued $11.6 million and $12.7 million, respectively, for remedial liabilities relating to the Ville Mercier legal proceedings. The decrease was primarily 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 anyadditional 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 March 31, 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 March 31, 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 an 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 March 31, 2015. From January 1, 2015 to March 31, 2015, 11 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. 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. The settlement must be approved by the court in a fairness hearing, which is anticipated to occur in June 2015. The exact settlement cost is not yet determinable, but it is not expected to be material.

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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 127 sites which are subject to or are proposed to become subject to proceedings under federal or state Superfund laws. Of the 127 sites, two (the Wichita Facility and the BR Facility described below) involve facilities that are now owned by the Company and 125 involve third party sites to which either the Company or the prior owners of certain of the Company’s facilities shipped wastes. Of the 125 third party sites, 29 are now settled, 22 are currently requiring expenditures on remediation and 74 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, Clean Harbors believes its potential liability could exceed $100,000 at 12 of the 125 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 which the Company anticipates but cannot guarantee will be available to reimburse certain such cleanup costs.

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 125 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 five 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 16 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 16 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 125 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 March 31, 2015 and December 31, 2014, there were three and four proceedings, respectively, for which the Company reasonably believed that the sanctions could equal or exceed $100,000. The Company believes that the fines or

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other penalties in these or any of the other regulatory proceedings will, individually or in the aggregate, not have a material effect on its financial condition, results of operations or cash flows.

(16) 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. During the second quarter of 2014, the Company reassigned certain departments among its operating segments consistent with management reporting changes as well as the identification of Lodging Services as an additional segment. Under the new structure, the Company's operations are managed in six reportable segments based primarily upon the nature of the various operations and services provided: Technical Services, Industrial and Field Services which consists of the Industrial Services and Field Services operating segments, Oil Re-refining and Recycling, SK Environmental Services, Lodging Services and Oil and Gas Field Services. The prior year segment information has been recast to conform to the current year presentation.

The following table reconciles third party revenues to direct revenues for the three months ended March 31, 2015 and 2014 (in thousands):

	For the Three Months Ended March 31, 2015											For the Three Months Ended March 31, 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	$	240,325	$	34,904		$	1,297		$	276,526		$	236,781	$	37,434		$	399		$	274,614
Industrial and Field Services	146,868		(6,561		)	78			140,385			161,960		(11,758		)	155			150,357
Oil Re-refining and Recycling	96,807		(18,257		)	(1		)	78,549			128,921		(48,116		)	—			80,805
SK Environmental Services	160,684		(11,582		)	—			149,102			161,388		19,957			(58		)	181,287
Lodging Services	34,104		164			17			34,285			56,694		394			1			57,089
Oil and Gas Field Services	53,587		1,332			9			54,928			100,772		2,089			12			102,873
Corporate Items	124		—			(1,400		)	(1,276		)	151		—			(509		)	(358		)
Total	$	732,499	$	—		$	—		$	732,499		$	846,667	$	—		$	—		$	846,667

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 (loss) income plus accretion of environmental liabilities, depreciation and amortization, net interest expense, (benefit) provision for income taxes, other non-cash charges not deemed representative of fundamental segment results and excludes other income. Transactions between the segments are accounted for at the Company’s best estimate based on similar transactions with outside customers. 

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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 (income) expense to its segments.    

	For the Three Months Ended
	March 31,
	2015			2014
Adjusted EBITDA:
Technical Services	$	63,401		$	62,177
Industrial and Field Services	10,309			16,372
Oil Re-refining and Recycling	(4,476		)	12,583
SK Environmental Services	27,249			22,825
Lodging Services	6,910			17,737
Oil and Gas Field Services	1,403			16,331
Corporate Items	(26,519		)	(46,039		)
Total	$	78,277		$	101,986
Reconciliation to Consolidated Statements of (Loss) Income:
Accretion of environmental liabilities	2,619			2,724
Depreciation and amortization	68,356			69,356
Income from operations	7,302			29,906
Other income	(409		)	(4,178		)
Interest expense, net of interest income	19,438			19,554
(Loss) income before (benefit) provision for income taxes	$	(11,727	)	$	14,530

The following table presents certain assets by reportable segment and in the aggregate (in thousands):

	March 31, 2015
	Technical Services		Industrial and Field Services		Oil Re-refining and Recycling		SK Environmental Services		Lodging Services		Oil and Gas Field Services		Corporate Items		Totals
Property, plant and equipment, net	$	423,520	$	247,136	$	194,767	$	232,072	$	125,281	$	190,301	$	89,420	$	1,502,497
Goodwill	49,667		107,193		50,303		171,906		35,030		31,313		—		445,412
Permits and other intangible, net	77,280		16,814		147,598		249,003		9,389		19,961		—		520,045
Total assets	$	764,557	$	394,345	$	503,987	$	711,062	$	206,871	$	323,265	$	641,955	$	3,546,042

	December 31, 2014
	Technical Services		Industrial and Field Services		Oil Re-refining and Recycling		SK Environmental Services		Lodging Services		Oil and Gas Field Services		Corporate Items		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):

	March 31, 2015		December 31, 2014
United States	$	2,528,087	$	2,572,494
Canada	1,014,805		1,128,458
Other foreign	3,150		3,326
Total	$	3,546,042	$	3,704,278

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(17) 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 March 31, 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 March 31, 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 March 31, 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 March 31, 2015 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	84,881	$	78,608	$	70,250	$	—		$	233,739
Intercompany receivables	141,084		255,080		42,134		(438,298		)	—
Accounts receivable, net	—		388,652		132,911		—			521,563
Other current assets	33		214,784		73,066		—			287,883
Property, plant and equipment, net	—		973,825		528,672		—			1,502,497
Investments in subsidiaries	2,602,744		605,528		—		(3,208,272		)	—
Intercompany debt receivable	—		300,706		3,701		(304,407		)	—
Goodwill	—		324,930		120,482		—			445,412
Permits and other intangibles, net	—		435,343		84,702		—			520,045
Other long-term assets	15,982		13,005		5,916		—			34,903
Total assets	$	2,844,724	$	3,590,461	$	1,061,834	$	(3,950,977	)	$	3,546,042
Liabilities and Stockholders’ Equity:
Current liabilities	$	18,620	$	416,437	$	84,804	$	—		$	519,861
Intercompany payables	264,554		171,792		1,952		(438,298		)	—
Closure, post-closure and remedial liabilities, net	—		153,029		22,712		—			175,741
Long-term obligations	1,395,000		—		—		—			1,395,000
Intercompany debt payable	3,701		—		300,706		(304,407		)	—
Other long-term liabilities	—		246,459		46,132		—			292,591
Total liabilities	1,681,875		987,717		456,306		(742,705		)	2,383,193
Stockholders’ equity	1,162,849		2,602,744		605,528		(3,208,272		)	1,162,849
Total liabilities and stockholders’ equity	$	2,844,724	$	3,590,461	$	1,061,834	$	(3,950,977	)	$	3,546,042

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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

19

Following is the consolidating statement of (loss) income for the three months ended March 31, 2015 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	418,517		$	193,453		$	(15,640	)	$	596,330
Product revenues	—			116,536			23,204			(3,571		)	136,169
Total revenues	—			535,053			216,657			(19,211		)	732,499
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			277,602			154,428			(15,640		)	416,390
Product cost of revenues	—			115,286			18,402			(3,571		)	130,117
Total cost of revenues	—			392,888			172,830			(19,211		)	546,507
Selling, general and administrative expenses	25			80,984			26,706			—			107,715
Accretion of environmental liabilities	—			2,306			313			—			2,619
Depreciation and amortization	—			45,801			22,555			—			68,356
(Loss) income from operations	(25		)	13,074			(5,747		)	—			7,302
Other income	—			111			298			—			409
Interest (expense) income	(19,639		)	178			23			—			(19,438		)
Equity in earnings of subsidiaries, net of taxes	4,709			(7,029		)	—			2,320			—
Intercompany interest income (expense)	—			5,977			(5,977		)	—			—
(Loss) income before provision for income taxes	(14,955		)	12,311			(11,403		)	2,320			(11,727		)
(Benefit) provision for income taxes	(7,866		)	7,602			(4,374		)	—			(4,638		)
Net (loss) income	(7,089		)	4,709			(7,029		)	2,320			(7,089		)
Other comprehensive loss	(77,403		)	(77,403		)	(50,635		)	128,038			(77,403		)
Comprehensive loss	$	(84,492	)	$	(72,694	)	$	(57,664	)	$	130,358		$	(84,492	)

20

Following is the consolidating statement of income for the three months ended March 31, 2014 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	445,903		$	218,171		$	(3,979	)	$	660,095
Product revenues	—			135,203			52,494			(1,125		)	186,572
Total revenues	—			581,106			270,665			(5,104		)	846,667
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			306,290			164,488			(3,979		)	466,799
Product cost of revenues	—			115,257			44,788			(1,125		)	158,920
Total cost of revenues	—			421,547			209,276			(5,104		)	625,719
Selling, general and administrative expenses	31			87,575			31,356			—			118,962
Accretion of environmental liabilities	—			2,381			343			—			2,724
Depreciation and amortization	—			42,808			26,548			—			69,356
(Loss) income from operations	(31		)	26,795			3,142			—			29,906
Other income	—			582			3,596			—			4,178
Interest (expense) income	(19,734		)	234			(54		)	—			(19,554		)
Equity in earnings of subsidiaries, net of taxes	20,819			(519		)	—			(20,300		)	—
Intercompany dividend income	—			—			3,100			(3,100		)	—
Intercompany interest income (expense)	—			9,057			(9,057		)	—			—
Income before (benefit) provision for income taxes	1,054			36,149			727			(23,400		)	14,530
(Benefit) provision for income taxes	(7,906		)	15,330			(1,854		)	—			5,570
Net income	8,960			20,819			2,581			(23,400		)	8,960
Other comprehensive (loss) income	(41,525		)	(41,525		)	19,682			21,843			(41,525		)
Comprehensive (loss) income	$	(32,565	)	$	(20,706	)	$	22,263		$	(1,557	)	$	(32,565	)

21

Following is the condensed consolidating statement of cash flows for the three months ended March 31, 2015 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net cash (used in) from operating activities	$	(8,032	)	$	85,311		$	7,498		$	—		$	84,777
Cash flows from investing activities:
Additions to property, plant and equipment	—			(37,670		)	(15,279		)	—			(52,949		)
Proceeds from sales of fixed assets	—			113			647			—			760
Costs to obtain or renew permits	—			—			(1,171		)	—			(1,171		)
Intercompany	—			(108,435		)	—			108,435			—
Net cash used in investing activities	—			(145,992		)	(15,803		)	108,435			(53,360		)
Cash flows from (used in) financing activities:
Change in uncashed checks	—			(14,694		)	(5,574		)	—			(20,268		)
Issuance of restricted shares, net of shares remitted	(1,154		)	—			—			—			(1,154		)
Repurchases of common stock	(15,379		)	—			—			—			(15,379		)
Excess tax benefit of stock-based compensation	5			—			—			—			5
Payments on capital leases	—			(164		)	(234		)	—			(398		)
Intercompany	108,435			—			—			(108,435		)	—
Net cash from (used in) financing activities	91,907			(14,858		)	(5,808		)	(108,435		)	(37,194		)
Effect of exchange rate change on cash	—			—			(7,363		)	—			(7,363		)
Increase (decrease) in cash and cash equivalents	83,875			(75,539		)	(21,476		)	—			(13,140		)
Cash and cash equivalents, beginning of period	1,006			154,147			91,726			—			246,879
Cash and cash equivalents, end of period	$	84,881		$	78,608		$	70,250		$	—		$	233,739

22

Following is the condensed consolidating statement of cash flows for the three months ended March 31, 2014 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net cash (used in) from operating activities	$	(49,377	)	$	72,813		$	(6,519	)	$	(12,321	)	$	4,596
Cash flows from investing activities:
Additions to property, plant and equipment	—			(46,287		)	(28,718		)	—			(75,005		)
Proceeds from sale of fixed assets	—			228			648			—			876
Costs to obtain or renew permits	—			(111		)	(964		)	—			(1,075		)
Proceeds from sale of long term investments	—			—			12,870			—			12,870
Intercompany	—			(49,094		)	—			49,094			—
Net cash used in investing activities	—			(95,264		)	(16,164		)	49,094			(62,334		)
Cash flows from (used in) financing activities:
Change in uncashed checks	—			60			(39		)	—			21
Proceeds from employee stock purchase plan	2,141			—			—			—			2,141
Issuance of restricted shares, net of shares remitted	(750		)	—			—			—			(750		)
Repurchases of common stock	(1,225		)	—			—			—			(1,225		)
Excess tax benefit of stock-based compensation	117			—			—			—			117
Payments of capital leases	—			(42		)	(596		)	—			(638		)
Dividends (paid) / received	—			(12,321		)	—			12,321			—
Intercompany	49,094			—			—			(49,094		)	—
Net cash from (used in) financing activities	49,377			(12,303		)	(635		)	(36,773		)	(334		)
Effect of exchange rate change on cash	—			—			(2,994		)	—			(2,994		)
Decrease in cash and cash equivalents	—			(34,754		)	(26,312		)	—			(61,066		)
Cash and cash equivalents, beginning of period	1,006			235,505			73,562			—			310,073
Cash and cash equivalents, end of period	$	1,006		$	200,751		$	47,250		$	—		$	249,007

(18) SUBSEQUENT EVENTS

On May 6, 2015, the Company announced that it has expanded its planned carve-out to include the entire Lodging Services segment. The Company previously announced that it intended to include only the drilling-related mobile assets as part of the expected standalone public entity, along with the Oil and Gas Field Services segment. Timing could take more than 12 months and completion of the carve-out is subject to certain conditions including, but not limited to, market conditions, determination of the most advantageous structure from a financial and tax standpoint, overall costs to our Company, receipt of regulatory approvals, compliance with our debt covenants, the effectiveness of securities laws filings and final approval by our board of directors. There can be no assurance regarding the ultimate structure and timing of the proposed transaction or whether the transaction will be completed.

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ITEM 2.MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Forward-Looking Statements

In addition to historical information, this Quarterly Report on Form 10-Q contains forward-looking statements, which are generally identifiable by use of the words “believes,” “expects,” “intends,” “anticipates,” “plans to,” “estimates,” “projects,” or similar expressions. These forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from those reflected in these forward-looking statements. Factors that might cause such a difference include, but are not limited to, those discussed under Item 1A, “Risk Factors,” in our Annual Report on Form 10-K filed with the Securities and Exchange Commission on March 3, 2014, under Item 1A, “Risk Factors,” included in Part II—Other Information in this report, and in other documents we file from time to time with the SEC.  Readers are cautioned not to place undue reliance on these forward-looking statements, which reflect management’s opinions only as of the date hereof. We undertake no obligation to revise or publicly release the results of any revision to these forward-looking statements.

Highlights

Total revenues in the three months ended March 31, 2015 were $732.5 million compared with $846.7 million in the three months ended March 31, 2014, respectively. The decrease in total revenues were primarily due to decreases in our Oil and Gas Field Services and Lodging Services Segments whose operations are predominantly located in Canada and have been negatively impacted by the current downturn in oil related industries. Foreign currency also negatively impacted these businesses on a comparative basis. Macroeconomic factors in the base oil markets which have driven oil pricing downward also negatively impacted revenues recorded by the SK Environmental Services and Oil Re-refining and Recycling Segments. Changes in segment revenues which in turn resulted in lower income measures are more fully described in our Segment Performance section below under the heading "Direct Revenues." We reported income from operations for the three months ended March 31, 2015 of $7.3 million compared with income from operations of $29.9 million in the three months ended March 31, 2014, respectively. Adjusted EBITDA for the three months ended March 31, 2015decreased23.2% to $78.3 million from $102.0 million in the three months ended March 31, 2014. Additional information, including a reconciliation of Adjusted EBITDA to Net Income, appears below under the heading "Adjusted EBITDA."

24

Segment data

Performance of our segments is evaluated on several factors of which the primary financial measure is Adjusted EBITDA. The following tables set forth certain operating data associated with our results of operations and summarize Adjusted EBITDA contribution by reportable segment for the three months ended March 31, 2015 and 2014 (in thousands).

	Summary of Operations (in thousands)
	For the Three Months Ended
	2015			2014			$ Change			% Change
Third Party Revenues(1):
Technical Services	$	240,325		$	236,781		$	3,544		1.5%
Industrial and Field Services	146,868			161,960			(15,092		)	(9.3)
Oil Re-refining and Recycling	96,807			128,921			(32,114		)	(24.9)
SK Environmental Services	160,684			161,388			(704		)	(0.4)
Lodging Services	34,104			56,694			(22,590		)	(39.8)
Oil and Gas Field Services	53,587			100,772			(47,185		)	(46.8)
Corporate Items	124			151			(27		)	(17.9)
Total	$	732,499		$	846,667		$	(114,168	)	(13.5)%
Direct Revenues(1):
Technical Services	$	276,526		$	274,614		$	1,912		0.7%
Industrial and Field Services	140,385			150,357			(9,972		)	(6.6)
Oil Re-refining and Recycling	78,549			80,805			(2,256		)	(2.8)
SK Environmental Services	149,102			181,287			(32,185		)	(17.8)
Lodging Services	34,285			57,089			(22,804		)	(39.9)
Oil and Gas Field Services	54,928			102,873			(47,945		)	(46.6)
Corporate Items	(1,276		)	(358		)	(918		)	(256.4)
Total	732,499			846,667			(114,168		)	(13.5)
Cost of Revenues(2):
Technical Services	189,540			189,775			(235		)	(0.1)
Industrial and Field Services	114,419			119,564			(5,145		)	(4.3)
Oil Re-refining and Recycling	78,224			64,109			14,115			22.0
SK Environmental Services	94,530			130,273			(35,743		)	(27.4)
Lodging Services	25,760			37,933			(12,173		)	(32.1)
Oil and Gas Field Services	47,413			79,149			(31,736		)	(40.1)
Corporate Items	(3,379		)	4,916			(8,295		)	(168.7)
Total	546,507			625,719			(79,212		)	(12.7)
Selling, General & Administrative Expenses:
Technical Services	23,585			22,662			923			4.1
Industrial and Field Services	15,657			14,421			1,236			8.6
Oil Re-refining and Recycling	4,801			4,113			688			16.7
SK Environmental Services	27,323			28,189			(866		)	(3.1)
Lodging Services	1,615			1,419			196			13.8
Oil and Gas Field Services	6,112			7,393			(1,281		)	(17.3)
Corporate Items	28,622			40,765			(12,143		)	(29.8)
Total	107,715			118,962			(11,247		)	(9.5)
Adjusted EBITDA:
Technical Services	63,401			62,177			1,224			2.0
Industrial and Field Services	10,309			16,372			(6,063		)	(37.0)
Oil Re-refining and Recycling	(4,476		)	12,583			(17,059		)	(135.6)
SK Environmental Services	27,249			22,825			4,424			19.4
Lodging Services	6,910			17,737			(10,827		)	(61.0)
Oil and Gas Field Services	1,403			16,331			(14,928		)	(91.4)
Corporate Items	(26,519		)	(46,039		)	19,520			42.4
Total	$	78,277		$	101,986		$	(23,709	)	(23.2)%

______________________

1. 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.

2. Cost of revenue is shown exclusive of items shown separately on the statements of income which consist of (i) accretion of environmental liabilities and (ii) depreciation and amortization.

25

Direct Revenues

There are many factors which have impacted, and continue to impact, our revenues. These factors include, but are not limited to: foreign currency rate volatility, acquisitions, general economic conditions and specific industry conditions which at the current time are heavily impacted by the oil and gas related industries, competitive industry pricing, the effects of fuel prices on our fuel recovery fees, and the level of emergency response projects.

Technical Services direct revenues increased$1.9 million in the three months ended March 31, 2015 from the comparable period in 2014 primarily due to overall growth in our treatment, storage and disposal network as a result of greater drum volumes, increases in remediation projects and greater landfill tonnage, partially offset by lower commodity pricing on certain metals and other materials we recycle and negative impacts from foreign currency translation from the comparable period in 2014. Our incinerators generated a utilization rate of 90.9% for the three months ended March 31, 2015, compared with 88.8% in the comparable period of 2014. Our landfill volumes increased 20.7% in the three months ended March 31, 2015 from the comparable period in 2014.

Industrial and Field Services direct revenues decreased$10.0 million in the three months ended March 31, 2015 from the comparable period in 2014. The decrease was primarily due to decreased activity in the oil sands region commensurate with the overall economic downturn seen in that area and the effects of foreign currency translation.

Oil Re-refining and Recycling direct revenues decreased$2.3 million in the three months ended March 31, 2015 from the comparable period in 2014 primarily due to lower volumes and lower sales prices for both base and blended oils which reduced the segment’s portion of these revenues. These lower sales prices that were in effect during the quarter ended March 31, 2015 resulted from macroeconomic factors in the base and blended oil markets which reduced market pricing during the latter half of 2014.

SK Environmental Services direct revenues decreased$32.2 million in the three months ended March 31, 2015 from the comparable period in 2014 primarily due to significant decreases in the intercompany sales prices of used oil sold to and utilized by the Oil Re-refining and Recycling segment in the manufacturing of its products and lower volumes of refined fuel oil sales to third parties as well as the negative effects of foreign currency translation.

Lodging Services direct revenues decreased$22.8 million in the three months ended March 31, 2015 from the comparable period in 2014 primarily due to lower overall occupancy rates and resulting lower pricing at our camps and lodges. These decreases are reflective of current economic factors due to lower levels of overall activity in the oil sands region and other areas of Western Canada where the majority of this segment operates. Additionally, revenues were negatively impacted by currency translation, as compared to the comparable period in 2014.

Oil and Gas Field Services direct revenues decreased$47.9 million in the three months ended March 31, 2015 from the comparable period in 2014. These decreases were primarily due to lower levels of exploration and other oil and gas related activity due to a shorter than normal drill season and project delays arising from currently depressed oil markets and uncertainty about future industry economic conditions. The decreased revenues were also negatively impacted by foreign currency translation.

Cost of Revenues

We believe that our ability to manage operating costs is important to our ability to remain price competitive. We continue to upgrade the quality and efficiency of our services through the development of new technology and continued modifications at our facilities, and implementation of strategic sourcing and other cost reduction initiatives.

Technical Services cost of revenues decreased$0.2 million in the three months ended March 31, 2015 from the comparable period in 2014 primarily due to decreases in fuel expense, turnaround costs and utilities, partially offset by increases in outside transportation, labor, materials and supplies as a result of the incremental revenue generated during the three months ended March 31, 2015. The improved profit margins resulted from overall mix of waste handled and greater operating efficiencies.

Industrial and Field Services cost of revenues decreased$5.1 million in the three months ended March 31, 2015 from the comparable periods in 2014 primarily due to decreases in fuel expense, labor and contractors as a result of decreased revenues during the period.

Oil Re-refining and Recycling cost of revenues increased$14.1 million in the three months ended March 31, 2015 from the comparable period in 2014 primarily due to the impacts of inventory revaluation, partially offset by decreases in used oil and oil additive costs and utilities incurred during the period.

SK Environmental Services cost of revenues decreased$35.7 million in the three months ended March 31, 2015 from the comparable period in 2014 primarily due to decreases in costs attributable to used oil collected by the business and sold to the Oil Re-refining and Recycling segment, allied products and fuel expense as a result of decreased revenues during the period.

26

Lodging Services cost of revenues decreased$12.2 million in the three months ended March 31, 2015 from the comparable period in 2014 primarily due to decreased revenues and lower costs related to our catering services which continue to be impacted by the lower levels of overall activity in the oil sands region and other areas of Western Canada.

Oil and Gas Field Services cost of revenues decreased$31.7 million in the three months ended March 31, 2015 from the comparable periods in 2014 primarily due to decreases in labor, fuel expense, equipment rentals and materials in connection with overall lower business activity and revenues.

Corporate cost of revenues decreased$8.3 million in the three months ended March 31, 2015 from the comparable periods in 2014 primarily due to benefits arising from overall decreases in insurance related costs recorded within the Corporate segment.

Selling, General and Administrative Expenses

Technical Services selling, general and administrative expenses increased$0.9 million in the three months ended March 31, 2015 from the comparable period in 2014 primarily due to changes in environmental liabilities, partially offset by decreases in salaries and benefits.

Industrial and Field Services selling, general and administrative expenses increased$1.2 million in the three months ended March 31, 2015 from the comparable period in 2014 primarily due to increases in sales and marketing related activity costs, partially offset by salaries and benefits, travel, professional fees and supplies.

Oil Re-refining and Recycling selling, general and administrative expenses increased$0.7 million in the three months ended March 31, 2015 from the comparable period in 2014 primarily due to increases in variable compensation partially offset by decreases in salaries and benefits, marketing and professional fees.

SK Environmental Services selling, general and administrative expenses decreased$0.9 million in the three months ended March 31, 2015 from the comparable period in 2014 primarily due to decreases in salaries and benefits, marketing and professional fees, partially offset by increases in variable compensation.

Lodging Services selling, general and administrative expenses increased$0.2 million in the three months ended March 31, 2015 from the comparable period in 2014 primarily due to increases in variable compensation.

Oil and Gas Field Services selling, general and administrative expenses decreased$1.3 million in the three months ended March 31, 2015 from the comparable period in 2014 primarily due to decreases in salaries and benefits, travel and supplies.

Corporate Items selling, general and administrative expenses decreased$12.1 million for the three months ended March 31, 2015, as compared to the same period in 2014 primarily due to lower benefit related expenses, variable compensation and severance related costs.

Adjusted Earnings Before Interest, Taxes, Depreciation and Amortization (“Adjusted EBITDA”)

Management considers Adjusted EBITDA to be a measurement of performance which provides useful information to both management and investors. Adjusted EBITDA should not be considered an alternative to net (loss) income or other measurements under generally accepted accounting principles ("GAAP"). Adjusted EBITDA is not calculated identically by all companies, therefore our measurements of Adjusted EBITDA may not be comparable to similarly titled measures reported by other companies.

We use Adjusted EBITDA to enhance our understanding of our operating performance, which represents our views concerning our performance in the ordinary, ongoing and customary course of our operations. We historically have found it helpful, and believe that investors have found it helpful, to consider an operating measure that excludes certain expenses relating to transactions not reflective of our core operations.

The information about our operating performance provided by this financial measure is used by our management for a variety of purposes. We regularly communicate Adjusted EBITDA results to our lenders and to our board of directors and discuss with the board our interpretation of such results. We also compare our Adjusted EBITDA performance against internal targets as a key factor in determining cash bonus compensation for executives and other employees, largely because we believe that this measure is indicative of how the fundamental business is performing and is being managed.

We also provide information relating to our Adjusted EBITDA so that analysts, investors and other interested persons have the same data that we use to assess our core operating performance. We believe that Adjusted EBITDA should be viewed only as a supplement to the GAAP financial information. We also believe, however, that providing this information in addition to, and together with, GAAP financial information permits the foregoing persons to obtain a better understanding of our core operating performance

27

and to evaluate the efficacy of the methodology and information used by management to evaluate and measure such performance on a standalone and a comparative basis.

The following is a reconciliation of net (loss) income to Adjusted EBITDA (in thousands):

	For the Three Months Ended
	March 31,
	2015			2014
Net (loss) income	$	(7,089	)	$	8,960
Accretion of environmental liabilities	2,619			2,724
Depreciation and amortization	68,356			69,356
Other income	(409		)	(4,178		)
Interest expense, net	19,438			19,554
(Benefit) provision for income taxes	(4,638		)	5,570
Adjusted EBITDA	$	78,277		$	101,986

Depreciation and Amortization

	For the Three Months Ended
	March 31,				2015 over 2014
	2015		2014		$ Change			% Change
Depreciation of fixed assets and landfill amortization	$	57,355	$	59,891	$	(2,536	)	(4.2	)%
Permits and other intangibles amortization	11,001		9,465		1,536			16.2
Total depreciation and amortization	$	68,356	$	69,356	$	(1,000	)	(1.4	)%

Depreciation and amortization decreased$1.0 million in the three months ended March 31, 2015 from the comparable period in 2014 primarily due to the impacts of foreign currency on depreciation of non-U.S. assets.

Other Income

	For the Three Months Ended
	March 31,				2015 over 2014
	2015		2014		$ Change			% Change
Other income	$	409	$	4,178	$	(3,769	)	90.2	%

Other income decreased$3.8 million in the three months ended March 31, 2015 from the comparable period in 2014 primarily due to gains on the sale of our available-for-sale securities that did not reoccur in the three months ended March 31, 2015.

Provision for Income Taxes

	For the Three Months Ended
	March 31,					2015 over 2014
	2015			2014		$ Change			% Change
Provision for income taxes	$	(4,638	)	$	5,570	$	(10,208	)	(183.3	)%

     Income tax expense for the three months ended March 31, 2015decreased$10.2 million as compared to the comparable period in 2014. The decrease is a result of the Company’s losses before tax in Canadian operations.

A valuation allowance is required to be established when, based on an evaluation of available evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. At March 31, 2015, we had a remaining valuation allowance of $29.4 million. The allowance as of March 31, 2015 consisted of $16.5 million of foreign tax credits, $3.9 million of state net operating loss carryforwards, $7.0 million of foreign net operating loss carryforwards and $2.0 million for the deferred tax assets of a Canadian subsidiary. At December 31, 2014, we had a remaining valuation allowance of $29.1 million. The allowance as of December 31, 2014 consisted of $16.5 million of foreign tax credits, $3.9 million of state net operating loss carryforwards, $6.7 million of foreign net operating loss carryforwards and $2.0 million for the deferred tax assets of a Canadian subsidiary.

28

Liquidity and Capital Resources

	For the Three Months Ended
(in thousands)	2015			2014
Net cash from operating activities	$	84,777		$	4,596
Net cash used in investing activities	(53,360		)	(62,334		)
Net cash from financing activities	(37,194		)	(334		)

Net cash from operating activities

Net cash from operating activities for the three months ended March 31, 2015 was $84.8 million, an increase of $80.2 million, compared with net cash from operating activities for the comparable period in 2014. The change was primarily the result of improvements in working capital including lower inventory levels resulting from the reduction in used oil costs.

Net cash used in investing activities

Net cash used in investing activities for three months ended March 31, 2015 was $53.4 million, a decrease of 14.4% compared with $62.3 million of cash used in investing activities for the comparable period in 2014. The change was primarily the result of decreases in capital expenditures, partially offset by proceeds received from the sale of marketable securities which occurred in the first three months of 2014 and did not reoccur in the current period.

Net cash from financing activities

Net cash from financing activities for the three months ended March 31, 2015 was an outflow of $37.2 million, compared to $0.3 million for the comparable period in 2014. The change in net cash from financing activities during the three months ended March 31, 2015 was primarily due to repurchases of common stock made in the first three months of 2015 and the change in uncashed checks which resulted from the timing of payments made by the Company.

Working Capital

We intend to use our existing cash and cash equivalents and cash flows from operations primarily to provide for our working capital needs and to fund capital expenditures and potential future acquisitions. We anticipate that our operating cash flow will provide the necessary funds on both a short- and long-term basis to meet operating cash requirements.

At March 31, 2015, cash and cash equivalents totaled $233.7 million, compared to $246.9 million at December 31, 2014. At March 31, 2015, cash and cash equivalents held by foreign subsidiaries totaled $70.3 million and were readily convertible into other foreign currencies including U.S. dollars. At March 31, 2015, the cash and cash equivalent balances for our U.S. operations were $163.5 million. Our U.S. operations had net operating cash from operations of $77.3 million for the three months ended March 31, 2015. Additionally, we have a $400.0 million revolving credit facility of which $209.6 million was available to borrow at March 31, 2015. Based on the above and on our current plans, we believe that our U.S. operations have adequate financial resources to satisfy their liquidity needs without being required to repatriate earnings from foreign subsidiaries. Accordingly, although repatriation to the U.S. of foreign earnings would generally be subject to U.S. income taxation, net of any available foreign tax credits, we have not recorded any deferred tax liability related to such repatriation since we intend to permanently reinvest foreign earnings outside the U.S.

We assess our liquidity in terms of our ability to generate cash to fund our operating, investing, and financing activities. Our primary ongoing cash requirements will be to fund operations, capital expenditures, interest payments and investments in line with our business strategy. We believe our future operating cash flows will be sufficient to meet our future operating and investing cash needs as well as any cash needs relating to the stock repurchase program. Furthermore, the existing cash balances and the availability of additional borrowings under our revolving credit facility provide potential sources of liquidity should they be required.

Common Stock Repurchase Program

On March 13, 2015, our Board of Directors increased the size of the Company’s current share repurchase program from $150 million to $300 million. We intend to fund the repurchases through available cash resources. The repurchase program authorizes us to purchase our common stock on the open market from time to time. The share repurchases will be made in a manner that complies with applicable U.S. securities laws. The number of shares purchased and the timing of the purchases will depend on a number of factors, including share price, cash required for future business plans, trading volume and other conditions.  We have no obligation to repurchase stock under this program and may suspend or terminate the repurchase program at any time. As of March 31, 2015, we had repurchased and retired a total of approximately 2.3 million shares of our common stock for approximately $120.5

29

million under this program. As of March 31, 2015, an additional $179.5 million remains available for repurchase of shares under the current authorized program.

Environmental Liabilities

(in thousands)	March 31, 2015		December 31, 2014		$ Change			% Change
Closure and post-closure liabilities	$	51,120	$	50,701	$	419		0.8	%
Remedial liabilities	149,745		155,121		(5,376		)	(3.5	)
Total environmental liabilities	$	200,865	$	205,822	$	(4,957	)	(2.4	)%

Total environmental liabilities as of March 31, 2015 were $200.9 million, a decrease of 2.4%, or $5.0 million, compared to December 31, 2014 primarily due to expenditures and foreign currency partially offset by interest accretion.

We anticipate our environmental liabilities, substantially all of which we assumed in connection with our acquisitions, will be payable over many years and that cash flow from operations will generally be sufficient to fund the payment of such liabilities when required. However, events not anticipated (such as future changes in environmental laws and regulations) could require that such payments be made earlier or in greater amounts than currently anticipated, which could adversely affect our results of operations, cash flow and financial condition.

In the three months ended March 31, 2015, the net increase in our environmental liabilities from changes in estimates recorded as a charge within the statement of income was $0.4 million and primarily related to two sites. An increase in the scope of work at one remediation site partially offset by a reduction at a Superfund site where a significant phase of the work was completed using funds collected from settling PRPs, and the previously budgeted cash expenditure was not required.

Financing Arrangements

The financing arrangements and principal terms of our $800.0 million principal amount of 5.25% senior unsecured notes due 2020 and $595.0 million principal amount of 5.125% senior unsecured notes due 2021 which were outstanding at March 31, 2015, and our $400.0 million revolving credit facility, are discussed further in Note 10, “Financing Arrangements,” to our consolidated financial statements included in Item 8 of our Annual Report on Form 10-K for the year ended December 31, 2014.

As of March 31, 2015, we were in compliance with the covenants of all of our debt agreements, and we believe it is reasonably likely that we will continue to meet such covenants.

Capital Expenditures

For 2015, we are continuing to target capital expenditures of $200 million, which excludes the construction of the El Dorado incinerator, which we still believe will likely add approximately $50 million in 2015.  We also intend to sell approximately $25-$50 million of non-essential assets, so that our capital expenditures net of these intended dispositions will be approximately $200-$225 million in 2015. However, changes in environmental regulations could require us to make significant capital expenditures for our facilities and adversely affect our results of operations and cash flow.

Critical Accounting Policies and Estimates

Other than described below there were no material changes in the first three months of 2015 to the information provided under the heading “Critical Accounting Policies and Estimates” included in our Annual Report on Form 10-K for the year ended December 31, 2014.

Goodwill. Goodwill is not amortized but is reviewed for impairment annually as of December 31, or 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. If the fair value is less than the carrying amount, a more detailed analysis is performed to determine if goodwill is impaired. The loss, if any, is measured as the excess of the carrying value of the goodwill over the implied value of the goodwill. At interim periods we monitor the reporting units for any events and/or changes in circumstances that might indicate impairment and perform interim impairment tests when deemed necessary.

As disclosed in the our annual report for the year ended December 31, 2014, goodwill attributable to the Oil and Gas Field Services reporting unit was at risk of impairment because of lower operating results caused by the depressed economic conditions and lower levels of activity in the Oil and Gas industry primarily in Western Canada.  During the quarter ended March 31, 2015, we continued to monitor the reporting unit’s performance along with other business specific and macroeconomic and industry factors and concluded that as of March 31, 2015 events and changes in circumstances have not arisen which would indicate that the fair values of this reporting unit was less than its carrying values.  Given the results of our most recent annual impairment test performed

30

at December 31, 2014 and considerations assessed during the current quarter, we continue to believe that there is risk of future impairment relative to the goodwill balance of the Oil and Gas Field Services reporting unit As of March 31, 2015, goodwill attributable to this reporting unit was $31.3 million. We will continue to monitor the business for events or circumstances which could indicate that the reporting unit’s fair value more likely than not no longer exceeds its carrying value and perform interim goodwill impairment tests as deemed necessary.

Significant judgments and unobservable inputs categorized as level III in the fair value hierarchy are inherent in the annual 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’s near term expectations of cash flows include additional cost cutting and efficiency initiatives to mitigate some of the near term pressures brought on by the current state of the oil and gas industry. We believe that the assumptions used in our impairment analyses are reasonable, but variations in any of the assumptions may result in future impairments being recorded. If the Oil and Gas Field Services reporting unit does not achieve the financial performance that we expect, our long term performance expectations change or market factors such as interest rates significantly change from current levels, it is possible that a goodwill impairment charge may result.

ITEM 3.QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

There were no material changes in the first three months of 2015 to the information provided under Item 7A. “Quantitative and Qualitative Disclosures about Market Risk” in the Company's Annual Report on Form 10-K for the year ended December 31, 2014.

ITEM 4.CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Based on an evaluation under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, as of the end of the period covered by this Quarterly Report on 10-Q, our Chief Executive Officer and Chief Financial Officer have concluded that our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) were effective as of March 31, 2015 to ensure that information required to be disclosed by us in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in Securities and Exchange Commission rules and forms and is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

There were no changes in the Company’s internal control over financial reporting identified in connection with the evaluation required by paragraph (d) of Exchange Act Rules 13a-15 or 15d-15 that was conducted during the quarter ending March 31, 2015 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

31

CLEAN HARBORS, INC. AND SUBSIDIARIES

PART II—OTHER INFORMATION

ITEM 1.LEGAL PROCEEDINGS

See Note 15, “Commitments and Contingencies,” to the financial statements included in Item 1 of this report, which description is incorporated herein by reference.

ITEM 1A.RISK FACTORS

During the three months ended March 31, 2015, there were no material changes from the risk factors as previously disclosed in Item 1A in the Company's Annual Report on Form 10-K for the year ended December 31, 2014. 

ITEM 2.UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

Common Stock Repurchase Program

The following table provides information with respect to the shares of common stock repurchased by us for the periods indicated.

Period	Total Number of Shares Purchased (1)	Average Price Paid Per Share (2)		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs (3)
January 1, 2015 through January 31, 2015	4,039	$	45.29	—	$	45,658.509
February 1, 2015 through February 28, 2015	435	$	49.14	—	$	45,658,509
March 1, 2015 through March 31, 2015	303,019	$	56.31	285,888	$	179,543,768
Total	307,493	$	56.16	285,888	$	179,543,768

______________________

(1) Includes 21,605 shares withheld by us from employees to satisfy employee tax obligations upon vesting of restricted stock units granted to our employees under our long-term equity incentive programs.

(2) The average price paid per share of common stock repurchased under the stock repurchase program includes the commissions paid to the brokers.

(3) On March 13, 2015, the Company's Board of Directors increased the size of the Company’s current share repurchase program from up to $150 million to up to $300 million. We intend to fund the repurchases through available cash resources. The stock repurchase program authorizes us to purchase our common stock on the open market from time to time. The stock repurchases will be made in a manner that complies with applicable U.S. securities laws. The number of shares purchased and the timing of the purchases will depend on a number of factors, including share price, cash required for future business plans, trading volume and other conditions. We have no obligation to repurchase stock under this program and may suspend or terminate the repurchase program at any time.

ITEM 3.DEFAULTS UPON SENIOR SECURITIES

None

ITEM 4.MINE SAFETY DISCLOSURE

Not applicable

ITEM 5.OTHER INFORMATION

None

32

ITEM 6.EXHIBITS

Item No.	Description	Location
31.1	Rule 13a-14a/15d-14(a) Certification of the CEO Alan S. McKim	Filed herewith
31.2	Rule 13a-14a/15d-14(a) Certification of the CFO James M. Rutledge	Filed herewith
32	Section 1350 Certifications	Filed herewith
101	Interactive Data Files Pursuant to Rule 405 of Regulation S-T: Financial statements from the quarterly report on Form 10-Q of Clean Harbors, Inc. for the quarter ended March 31, 2015, formatted in XBRL: (i) Consolidated Balance Sheets, (ii) Unaudited Consolidated Statements of (Loss) Income, (iii) Unaudited Consolidated Statements of Comprehensive Loss, (iv) Unaudited Consolidated Statements of Cash Flows, (v) Unaudited Consolidated Statements of Stockholders’ Equity, and (vi) Notes to Unaudited Consolidated Financial Statements.	*

_______________________

* Interactive data files are furnished and deemed not filed or part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933, as amended, are deemed not filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and otherwise are not subject to liability under those sections.

33

CLEAN HARBORS, INC. AND SUBSIDIARIES

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. 

		CLEAN HARBORS, INC.
		Registrant
		By:	/s/  ALAN S. MCKIM
			Alan S. McKim
			Chairman and Chief Executive Officer
Date:	May 7, 2015
		By:	/s/  JAMES M. RUTLEDGE
			James M. Rutledge
			Vice Chairman, President and Chief Financial Officer
Date:	May 7, 2015

34

EX-31.1

EXHIBIT 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

I, Alan S. McKim, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Clean Harbors, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

/s/ Alan S. McKim

Alan S. McKim

Chairman and Chief Executive Officer

Date: May 7, 2015

EX-31.2

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

I, James M. Rutledge, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Clean Harbors, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

/s/ James M. Rutledge

James M. Rutledge

Vice Chairman, President and Chief Financial Officer

Date: May 7, 2015

EX-32

EXHIBIT 32

CLEAN HARBORS, INC. AND SUBSIDIARIES

CERTIFICATION PURSUANT TO
SECTION 1350, CHAPTER 63 OF TITLE 18, UNITED STATES CODE,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES OXLEY ACT OF 2002

Pursuant to 18 U.S.C. §1350, each of the undersigned certifies that, to his knowledge, this Quarterly Report on Form 10-Q for the period ended March 31, 2015 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in this report fairly presents, in all material respects, the financial condition and results of operations of Clean Harbors, Inc.

		By:	/s/  ALAN S. MCKIM
			Alan S. McKim
			Chairman and Chief Executive Officer
Date:	May 7, 2015
		By:	/s/  JAMES M. RUTLEDGE
			James M. Rutledge
			Vice Chairman, President and Chief Financial Officer
Date:	May 7, 2015

XML

SEGMENT REPORTING (Tables)

3 Months Ended

Mar. 31, 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 months ended March 31, 2015 and 2014 (in thousands):

	For the Three Months Ended March 31, 2015											For the Three Months Ended March 31, 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	$	240,325	$	34,904		$	1,297		$	276,526		$	236,781	$	37,434		$	399		$	274,614
Industrial and Field Services	146,868		(6,561		)	78			140,385			161,960		(11,758		)	155			150,357
Oil Re-refining and Recycling	96,807		(18,257		)	(1		)	78,549			128,921		(48,116		)	—			80,805
SK Environmental Services	160,684		(11,582		)	—			149,102			161,388		19,957			(58		)	181,287
Lodging Services	34,104		164			17			34,285			56,694		394			1			57,089
Oil and Gas Field Services	53,587		1,332			9			54,928			100,772		2,089			12			102,873
Corporate Items	124		—			(1,400		)	(1,276		)	151		—			(509		)	(358		)
Total	$	732,499	$	—		$	—		$	732,499		$	846,667	$	—		$	—		$	846,667

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 (income) expense to its segments.    

	For the Three Months Ended
	March 31,
	2015			2014
Adjusted EBITDA:
Technical Services	$	63,401		$	62,177
Industrial and Field Services	10,309			16,372
Oil Re-refining and Recycling	(4,476		)	12,583
SK Environmental Services	27,249			22,825
Lodging Services	6,910			17,737
Oil and Gas Field Services	1,403			16,331
Corporate Items	(26,519		)	(46,039		)
Total	$	78,277		$	101,986
Reconciliation to Consolidated Statements of (Loss) Income:
Accretion of environmental liabilities	2,619			2,724
Depreciation and amortization	68,356			69,356
Income from operations	7,302			29,906
Other income	(409		)	(4,178		)
Interest expense, net of interest income	19,438			19,554
(Loss) income before (benefit) provision for income taxes	$	(11,727	)	$	14,530

PP&E, intangible assets and total assets by segment

The following table presents certain assets by reportable segment and in the aggregate (in thousands):

	March 31, 2015
	Technical Services		Industrial and Field Services		Oil Re-refining and Recycling		SK Environmental Services		Lodging Services		Oil and Gas Field Services		Corporate Items		Totals
Property, plant and equipment, net	$	423,520	$	247,136	$	194,767	$	232,072	$	125,281	$	190,301	$	89,420	$	1,502,497
Goodwill	49,667		107,193		50,303		171,906		35,030		31,313		—		445,412
Permits and other intangible, net	77,280		16,814		147,598		249,003		9,389		19,961		—		520,045
Total assets	$	764,557	$	394,345	$	503,987	$	711,062	$	206,871	$	323,265	$	641,955	$	3,546,042

	December 31, 2014
	Technical Services		Industrial and Field Services		Oil Re-refining and Recycling		SK Environmental Services		Lodging Services		Oil and Gas Field Services		Corporate Items		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):

	March 31, 2015		December 31, 2014
United States	$	2,528,087	$	2,572,494
Canada	1,014,805		1,128,458
Other foreign	3,150		3,326
Total	$	3,546,042	$	3,704,278

XML

(LOSS) EARNINGS PER SHARE (Computation of Basic and Diluted Earnings Per Share)(Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Numerator for basic and diluted (loss) earnings per share:
Net (loss) income	$ (7,089)	$ 8,960
Denominator:
Basic shares outstanding	58,875	60,720
Dilutive effect of equity-based compensation awards	0	141
Dilutive shares outstanding	58,875	60,861
Basic earnings per share (in USD per share)	$ (0.12)	$ 0.15
Diluted earnings per share (in USD per share)	$ (0.12)	$ 0.15

XML

ACCRUED EXPENSES (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Insurance	$ 56,992	$ 58,931
Interest	17,630	20,527
Accrued compensation and benefits	39,346	59,006
Income, real estate, sales and other taxes	29,872	38,297
Other	43,888	42,788
Total accrued expenses	$ 187,728	$ 219,549

XML

ACCUMULATED OTHER COMPREHENSIVE LOSS (Changes in Accumulated Other Comprehensive Loss by Component) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Beginning balance	$ (110,842)
Other comprehensive loss before reclassifications	(77,403)
Other comprehensive loss	(77,403)	(41,525)
Ending balance	(188,245)
Foreign Currency Translation
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Beginning balance	(108,889)
Other comprehensive loss before reclassifications	(77,403)
Other comprehensive loss	(77,403)
Ending balance	(186,292)
Unfunded Pension Liability
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Beginning balance	(1,953)
Other comprehensive loss before reclassifications	0
Other comprehensive loss	0
Ending balance	$ (1,953)

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GOODWILL AND OTHER INTANGIBLE ASSETS (Amortizable Other Intangible Assets) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	$ 556,099,000		$ 558,605,000
Accumulated Amortization	158,672,000		152,089,000
Net	397,427,000		406,516,000
Weighted Average Remaining Amortization Period (in years)	11 years 2 months 12 days		11 years 4 months 18 days
Total permits and other intangible assets, Cost	678,717,000		682,169,000
Total permits and other intangible assets, Net	520,045,000		530,080,000
Amortization of intangible assets	11,000,000	9,500,000
Trademarks and trade names
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible asset, cost	122,618,000		123,564,000
Permits
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	161,941,000		156,692,000
Accumulated Amortization	58,028,000		55,318,000
Net	103,913,000		101,374,000
Weighted Average Remaining Amortization Period (in years)	18 years 9 months 18 days		19 years 0 months 0 days
Customer and supplier relationships
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	363,681,000		370,373,000
Accumulated Amortization	81,563,000		77,697,000
Net	282,118,000		292,676,000
Weighted Average Remaining Amortization Period (in years)	10 years 10 months 24 days		11 years 0 months 0 days
Other intangible assets
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	30,477,000		31,540,000
Accumulated Amortization	19,081,000		19,074,000
Net	$ 11,396,000		$ 12,466,000
Weighted Average Remaining Amortization Period (in years)	2 years 9 months 18 days		3 years 2 months 0 days

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CLOSURE AND POST-CLOSURE LIABILITIES (Tables)

3 Months Ended

Mar. 31, 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 three months ended March 31, 2015 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2015	$	29,932		$	20,769		$	50,701
New asset retirement obligations	753			—			753
Accretion	682			496			1,178
Changes in estimates recorded to statement of income	—			(24		)	(24		)
Changes in estimates recorded to balance sheet	(932		)	—			(932		)
Expenditures	(246		)	(19		)	(265		)
Currency translation and other	(196		)	(95		)	(291		)
Balance at March 31, 2015	$	29,993		$	21,127		$	51,120

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STOCK-BASED COMPENSATION (Narrative) (Details) (USD $) Share data in Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 13, 2015	Mar. 12, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 1,800,000	$ 2,300,000
Income tax benefit	500,000	400,000
Repurchases of common stock	16,115,000
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)	2,300
Repurchases of common stock	120,500,000
Stock repurchase program, remaining authorized repurchase amount	179,500,000
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	14,000,000
Fair value restricted stock	3,200,000	2,300,000
Performance stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	300,000
Fair value restricted stock	$ 300,000	$ 0

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SEGMENT REPORTING

3 Months Ended

Mar. 31, 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. During the second quarter of 2014, the Company reassigned certain departments among its operating segments consistent with management reporting changes as well as the identification of Lodging Services as an additional segment. Under the new structure, the Company's operations are managed in six reportable segments based primarily upon the nature of the various operations and services provided: Technical Services, Industrial and Field Services which consists of the Industrial Services and Field Services operating segments, Oil Re-refining and Recycling, SK Environmental Services, Lodging Services and Oil and Gas Field Services. The prior year segment information has been recast to conform to the current year presentation.

The following table reconciles third party revenues to direct revenues for the three months ended March 31, 2015 and 2014 (in thousands):

	For the Three Months Ended March 31, 2015											For the Three Months Ended March 31, 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	$	240,325	$	34,904		$	1,297		$	276,526		$	236,781	$	37,434		$	399		$	274,614
Industrial and Field Services	146,868		(6,561		)	78			140,385			161,960		(11,758		)	155			150,357
Oil Re-refining and Recycling	96,807		(18,257		)	(1		)	78,549			128,921		(48,116		)	—			80,805
SK Environmental Services	160,684		(11,582		)	—			149,102			161,388		19,957			(58		)	181,287
Lodging Services	34,104		164			17			34,285			56,694		394			1			57,089
Oil and Gas Field Services	53,587		1,332			9			54,928			100,772		2,089			12			102,873
Corporate Items	124		—			(1,400		)	(1,276		)	151		—			(509		)	(358		)
Total	$	732,499	$	—		$	—		$	732,499		$	846,667	$	—		$	—		$	846,667

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 (loss) income plus accretion of environmental liabilities, depreciation and amortization, net interest expense, (benefit) provision for income taxes, other non-cash charges not deemed representative of fundamental segment results and excludes other income. Transactions between the segments are accounted for at the Company’s best estimate based on similar transactions with outside customers. 

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 (income) expense to its segments.    

	For the Three Months Ended
	March 31,
	2015			2014
Adjusted EBITDA:
Technical Services	$	63,401		$	62,177
Industrial and Field Services	10,309			16,372
Oil Re-refining and Recycling	(4,476		)	12,583
SK Environmental Services	27,249			22,825
Lodging Services	6,910			17,737
Oil and Gas Field Services	1,403			16,331
Corporate Items	(26,519		)	(46,039		)
Total	$	78,277		$	101,986
Reconciliation to Consolidated Statements of (Loss) Income:
Accretion of environmental liabilities	2,619			2,724
Depreciation and amortization	68,356			69,356
Income from operations	7,302			29,906
Other income	(409		)	(4,178		)
Interest expense, net of interest income	19,438			19,554
(Loss) income before (benefit) provision for income taxes	$	(11,727	)	$	14,530

The following table presents certain assets by reportable segment and in the aggregate (in thousands):

	March 31, 2015
	Technical Services		Industrial and Field Services		Oil Re-refining and Recycling		SK Environmental Services		Lodging Services		Oil and Gas Field Services		Corporate Items		Totals
Property, plant and equipment, net	$	423,520	$	247,136	$	194,767	$	232,072	$	125,281	$	190,301	$	89,420	$	1,502,497
Goodwill	49,667		107,193		50,303		171,906		35,030		31,313		—		445,412
Permits and other intangible, net	77,280		16,814		147,598		249,003		9,389		19,961		—		520,045
Total assets	$	764,557	$	394,345	$	503,987	$	711,062	$	206,871	$	323,265	$	641,955	$	3,546,042

	December 31, 2014
	Technical Services		Industrial and Field Services		Oil Re-refining and Recycling		SK Environmental Services		Lodging Services		Oil and Gas Field Services		Corporate Items		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):

	March 31, 2015		December 31, 2014
United States	$	2,528,087	$	2,572,494
Canada	1,014,805		1,128,458
Other foreign	3,150		3,326
Total	$	3,546,042	$	3,704,278

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REMEDIAL LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	$ 155,121
Accretion	1,441
Changes in estimates recorded to statement of income	409
Expenditures	(5,339)
Currency translation and other	(1,887)
Balance at end of year	149,745
Remedial Liabilities for Landfill Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	5,420
Accretion	63
Changes in estimates recorded to statement of income	(124)
Expenditures	(16)
Currency translation and other	(220)
Balance at end of year	5,123
Remedial Liabilities for Inactive Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	68,528
Accretion	718
Changes in estimates recorded to statement of income	27
Expenditures	(1,045)
Currency translation and other	(92)
Balance at end of year	68,136
Remedial Liabilities (Including Superfund) for Non-Landfill Operations
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	81,173
Accretion	660
Changes in estimates recorded to statement of income	506
Expenditures	(4,278)
Currency translation and other	(1,575)
Balance at end of year	$ 76,486

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BUSINESS COMBINATIONS (Evergreen Oil, Inc) (Details) (Privately owned domestic company, USD $) In Millions, unless otherwise specified	12 Months Ended	0 Months Ended
	Dec. 31, 2014 number_of_companies	Apr. 14, 2015
Business Acquisition [Line Items]
Number of Companies	2
Purchase price of acquisition	$ 16.1
Subsequent Event
Business Acquisition [Line Items]
Business Combination, Consideration Transferred		$ 85.0

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ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)

3 Months Ended

Mar. 31, 2015

Equity [Abstract]

Schedule of accumulated other comprehensive loss

The changes in accumulated other comprehensive loss by component and related tax effects for the three months ended March 31, 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	(77,403		)	—			(77,403		)
Other comprehensive loss	$	(77,403	)	$	—		$	(77,403	)
Balance at March 31, 2015	$	(186,292	)	$	(1,953	)	$	(188,245	)

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, with presentation location during the three months ended March 31, 2015 and March 31, 2014, were as follows (in thousands):

	For the Three Months Ended
Comprehensive Loss Components	March 31, 2015		March 31, 2014			Location
Unrealized gains on available-for-sale investments	$	—	$	(3,308	)	Other income

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INCOME TAXES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Income Tax Contingency [Line Items]
The Company's effective tax rate (as a percent)	39.50%	38.30%
Unrecognized tax benefits	$ 2.3		$ 2.5
Unrecognized tax benefits, interest			0.4
Foreign and State
Income Tax Contingency [Line Items]
Amount of decrease in unrecognized tax benefits that, if realized, will impact the effective tax rate	$ 0.6

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Statements of (Loss) Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues:
Service revenues	$ 596,330	$ 660,095
Product revenues	136,169	186,572
Total revenues	732,499	846,667
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	416,390	466,799
Product cost of revenues	130,117	158,920
Total cost of revenues	546,507	625,719
Selling, general and administrative expenses	107,715	118,962
Accretion of environmental liabilities	2,619	2,724
Depreciation and amortization	68,356	69,356
Income from operations	7,302	29,906
Other income	409	4,178
Interest (expense) income	(19,438)	(19,554)
Equity in earnings of subsidiaries, net of taxes	0	0
Intercompany dividend income		0
Intercompany interest income (expense)	0	0
(Loss) income before (benefit) provision for income taxes	(11,727)	14,530
(Benefit) provision for income taxes	(4,638)	5,570
Net (loss) income	(7,089)	8,960
Other comprehensive loss	(77,403)	(41,525)
Comprehensive loss	(84,492)	(32,565)
Clean Harbors, Inc.
Revenues:
Service revenues	0	0
Product revenues	0	0
Total revenues	0	0
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	0	0
Product cost of revenues	0	0
Total cost of revenues	0	0
Selling, general and administrative expenses	25	31
Accretion of environmental liabilities	0	0
Depreciation and amortization	0	0
Income from operations	(25)	(31)
Other income	0	0
Interest (expense) income	(19,639)	(19,734)
Equity in earnings of subsidiaries, net of taxes	4,709	20,819
Intercompany dividend income		0
Intercompany interest income (expense)	0	0
(Loss) income before (benefit) provision for income taxes	(14,955)	1,054
(Benefit) provision for income taxes	(7,866)	(7,906)
Net (loss) income	(7,089)	8,960
Other comprehensive loss	(77,403)	(41,525)
Comprehensive loss	(84,492)	(32,565)
U.S. Guarantor Subsidiaries
Revenues:
Service revenues	418,517	445,903
Product revenues	116,536	135,203
Total revenues	535,053	581,106
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	277,602	306,290
Product cost of revenues	115,286	115,257
Total cost of revenues	392,888	421,547
Selling, general and administrative expenses	80,984	87,575
Accretion of environmental liabilities	2,306	2,381
Depreciation and amortization	45,801	42,808
Income from operations	13,074	26,795
Other income	111	582
Interest (expense) income	178	234
Equity in earnings of subsidiaries, net of taxes	(7,029)	(519)
Intercompany dividend income		0
Intercompany interest income (expense)	5,977	9,057
(Loss) income before (benefit) provision for income taxes	12,311	36,149
(Benefit) provision for income taxes	7,602	15,330
Net (loss) income	4,709	20,819
Other comprehensive loss	(77,403)	(41,525)
Comprehensive loss	(72,694)	(20,706)
Foreign Non-Guarantor Subsidiaries
Revenues:
Service revenues	193,453	218,171
Product revenues	23,204	52,494
Total revenues	216,657	270,665
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	154,428	164,488
Product cost of revenues	18,402	44,788
Total cost of revenues	172,830	209,276
Selling, general and administrative expenses	26,706	31,356
Accretion of environmental liabilities	313	343
Depreciation and amortization	22,555	26,548
Income from operations	(5,747)	3,142
Other income	298	3,596
Interest (expense) income	23	(54)
Equity in earnings of subsidiaries, net of taxes	0	0
Intercompany dividend income		3,100
Intercompany interest income (expense)	(5,977)	(9,057)
(Loss) income before (benefit) provision for income taxes	(11,403)	727
(Benefit) provision for income taxes	(4,374)	(1,854)
Net (loss) income	(7,029)	2,581
Other comprehensive loss	(50,635)	19,682
Comprehensive loss	(57,664)	22,263
Consolidating Adjustments
Revenues:
Service revenues	(15,640)	(3,979)
Product revenues	(3,571)	(1,125)
Total revenues	(19,211)	(5,104)
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	(15,640)	(3,979)
Product cost of revenues	(3,571)	(1,125)
Total cost of revenues	(19,211)	(5,104)
Selling, general and administrative expenses	0	0
Accretion of environmental liabilities	0	0
Depreciation and amortization	0	0
Income from operations	0	0
Other income	0	0
Interest (expense) income	0	0
Equity in earnings of subsidiaries, net of taxes	2,320	(20,300)
Intercompany dividend income		(3,100)
Intercompany interest income (expense)	0	0
(Loss) income before (benefit) provision for income taxes	2,320	(23,400)
(Benefit) provision for income taxes	0	0
Net (loss) income	2,320	(23,400)
Other comprehensive loss	128,038	21,843
Comprehensive loss	$ 130,358	$ (1,557)

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SEGMENT REPORTING (Narrative) (Details)	3 Months Ended
	Mar. 31, 2015 segment
Segment Reporting [Abstract]
Number of reportable segments	6
Number of operations not managed by reportable segments	2

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GOODWILL AND OTHER INTANGIBLE ASSETS (Expected Future Amortization) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2015 (nine months)	$ 26,237
2016	34,583
2017	32,437
2018	29,739
2019	26,426
Thereafter	248,005
Net	$ 397,427	$ 406,516

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UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	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 (loss) income	(7,089)					(7,089)
Other comprehensive loss	(77,403)				(77,403)
Stock-based compensation	1,850			1,850
Issuance of restricted shares, net of shares remitted	(1,154)	1		(1,155)
Issuance of restricted shares, net of shares remitted		44
Repurchases of common stock	(16,115)	(3)		(16,112)
Repurchases of common stock		(286)
Net tax benefit on stock-based awards	(111)			(111)
Balance at end of period at Mar. 31, 2015	$ 1,162,849	$ 587	$ (469)	$ 789,501	$ (188,245)	$ 561,475
Balance ending of period (in shares) at Mar. 31, 2015		58,661

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SEGMENT REPORTING (Third Party Reveunes to Direct Revenues) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Total revenues	$ 732,499	$ 846,667
Third party revenues
Segment Reporting Information [Line Items]
Total revenues	732,499	846,667
Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	0	0
Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	0	0
Direct revenues
Segment Reporting Information [Line Items]
Total revenues	732,499	846,667
Technical Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	240,325	236,781
Technical Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	34,904	37,434
Technical Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	1,297	399
Technical Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	276,526	274,614
Industrial and Field Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	146,868	161,960
Industrial and Field Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(6,561)	(11,758)
Industrial and Field Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	78	155
Industrial and Field Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	140,385	150,357
Oil Re-refining and Recycling | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	96,807	128,921
Oil Re-refining and Recycling | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(18,257)	(48,116)
Oil Re-refining and Recycling | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(1)	0
Oil Re-refining and Recycling | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	78,549	80,805
SK Environmental Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	160,684	161,388
SK Environmental Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(11,582)	19,957
SK Environmental Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	0	(58)
SK Environmental Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	149,102	181,287
Lodging Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	34,104	56,694
Lodging Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	164	394
Lodging Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	17	1
Lodging Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	34,285	57,089
Oil and Gas Field Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	53,587	100,772
Oil and Gas Field Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	1,332	2,089
Oil and Gas Field Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	9	12
Oil and Gas Field Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	54,928	102,873
Corporate Items | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	124	151
Corporate Items | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	0	0
Corporate Items | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(1,400)	(509)
Corporate Items | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	$ (1,276)	$ (358)

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INVENTORIES AND SUPPLIES (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Oil and oil products	$ 37,785	$ 62,111
Supplies and drums	66,487	68,547
Solvent and solutions	9,627	9,355
Modular camp accommodations	15,441	15,776
Other	13,712	12,874
Total inventories and supplies	$ 143,052	$ 168,663

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INVENTORIES AND SUPPLIES (Tables)

3 Months Ended

Mar. 31, 2015

Inventory Disclosure [Abstract]

Schedule of Inventory

Inventories and supplies consisted of the following (in thousands):

	March 31, 2015		December 31, 2014
Oil and oil products	$	37,785	$	62,111
Supplies and drums	66,487		68,547
Solvent and solutions	9,627		9,355
Modular camp accommodations	15,441		15,776
Other	13,712		12,874
Total inventories and supplies	$	143,052	$	168,663

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SIGNIFICANT ACCOUNTING POLICIES (Policies)

3 Months Ended

Mar. 31, 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. This new guidance is currently effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2016.

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.

In April 2015, FASB issued ASU 2015-03, Interest - Imputation of Interest (Subtopic 835-30). The amendment provides guidance regarding the simplification of the presentation of debt issuance costs. 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 standard to be implemented will have on the Company's consolidated financial statements.

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ACCUMULATED OTHER COMPREHENSIVE LOSS (Amount Reclassified Out of Accumulated Other Comprehensive Loss) (Details) (Unrealized gains on available-for-sale investments, USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Unrealized gains on available-for-sale investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income	$ 0	$ (3,308)

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PROPERTY, PLANT AND EQUIPMENT (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,533,988,000		$ 2,564,340,000
Less - accumulated depreciation and amortization	1,031,491,000		1,005,506,000
Total property, plant and equipment, net	1,502,497,000		1,558,834,000
Interest capitalized to fixed assets	200,000	0
Depreciation inclusive of amortization	57,400,000	59,900,000
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	97,742,000		98,507,000
Asset retirement costs (non-landfill)
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,812,000		10,871,000
Landfill assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	116,889,000		110,984,000
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	334,282,000		338,242,000
Camp equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	163,434,000		180,575,000
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	468,862,000		471,615,000
Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,283,502,000		1,302,424,000
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,379,000		5,517,000
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 53,086,000		$ 45,605,000

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PROPERTY, PLANT AND EQUIPMENT (Tables)

3 Months Ended

Mar. 31, 2015

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, plant and equipment consisted of the following (in thousands):

	March 31, 2015		December 31, 2014
Land	$	97,742	$	98,507
Asset retirement costs (non-landfill)	10,812		10,871
Landfill assets	116,889		110,984
Buildings and improvements	334,282		338,242
Camp equipment	163,434		180,575
Vehicles	468,862		471,615
Equipment	1,283,502		1,302,424
Furniture and fixtures	5,379		5,517
Construction in progress	53,086		45,605
	2,533,988		2,564,340
Less - accumulated depreciation and amortization	1,031,491		1,005,506
Total property, plant and equipment, net	$	1,502,497	$	1,558,834

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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

3 Months Ended

Mar. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes to goodwill

The changes to goodwill for the three months ended March 31, 2015 were as follows (in thousands):

	2015
Balance at January 1, 2015	$	452,669
Increase from adjustments during the measurement period related to recent acquisitions	3,841
Foreign currency translation	(11,098		)
Balance at March 31, 2015	$	445,412

Summary of amortizable other intangible assets (indefinite-lived)

Below is a summary of amortizable other intangible assets (in thousands):

	March 31, 2015							December 31, 2014
	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)
Permits	$	161,941	$	58,028	$	103,913	18.8	$	156,692	$	55,318	$	101,374	19.0
Customer and supplier relationships	363,681		81,563		282,118		10.9	370,373		77,697		292,676		11.0
Other intangible assets	30,477		19,081		11,396		2.8	31,540		19,074		12,466		3.2
Total amortizable permits and other intangible assets	556,099		158,672		397,427		11.2	558,605		152,089		406,516		11.4
Trademarks and trade names	122,618		—		122,618		Indefinite	123,564		—		123,564		Indefinite
Total permits and other intangible assets	$	678,717	$	158,672	$	520,045		$	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 March 31, 2015 (in thousands):

Years Ending December 31,	Expected Amortization
2015 (nine months)	$	26,237
2016	34,583
2017	32,437
2018	29,739
2019	26,426
Thereafter	248,005
	$	397,427

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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net (loss) income	$ (7,089)	$ 8,960
Adjustments to reconcile net (loss) income to net cash from operating activities:
Depreciation and amortization	68,356	69,356
Allowance for doubtful accounts	2,204	2,086
Amortization of deferred financing costs and debt discount	819	824
Accretion of environmental liabilities	2,619	2,724
Changes in environmental liability estimates	385	(821)
Deferred income taxes	(903)	0
Stock-based compensation	1,850	2,278
Excess tax benefit of stock-based compensation	(5)	(117)
Net tax benefit on stock based awards	(111)	117
Other income	(409)	(4,178)
Environmental expenditures	(5,604)	(4,186)
Changes in assets and liabilities, net of acquisitions
Accounts receivable and unbilled accounts receivable	27,065	(11,069)
Inventories and supplies	22,131	(1,709)
Other current assets	374	(15,722)
Accounts payable	2,623	(23,374)
Other current and long-term liabilities	(29,528)	(20,573)
Net cash from operating activities	84,777	4,596
Cash flows from investing activities:
Additions to property, plant and equipment	(52,949)	(75,005)
Proceeds from sales of fixed assets	760	876
Proceeds from sales of marketable securities	0	12,870
Additions to intangible assets, including costs to obtain or renew permits	(1,171)	(1,075)
Net cash used in investing activities	(53,360)	(62,334)
Cash flows from financing activities:
Change in uncashed checks	(20,268)	21
Issuance of restricted shares, net of shares remitted	(1,154)	(750)
Repurchases of common stock	(15,379)	(1,225)
Proceeds from employee stock purchase plan	0	2,141
Payments on capital leases	(398)	(638)
Excess tax benefit of stock-based compensation	5	117
Net cash from financing activities	(37,194)	(334)
Effect of exchange rate change on cash	(7,363)	(2,994)
Decrease in cash and cash equivalents	(13,140)	(61,066)
Cash and cash equivalents, beginning of period	246,879	310,073
Cash and cash equivalents, end of period	233,739	249,007
Cash payments for interest and income taxes:
Interest paid	21,667	21,436
Income taxes (received) paid	(3,790)	5,389
Non-cash investing and financing activities:
Accrual for repurchased shares	736	0
Property, plant and equipment accrued	$ 22,832	$ 26,715

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ACCRUED EXPENSES (Tables)

3 Months Ended

Mar. 31, 2015

Payables and Accruals [Abstract]

Accrued expenses

Accrued expenses consisted of the following (in thousands):

	March 31, 2015		December 31, 2014
Insurance	$	56,992	$	58,931
Interest	17,630		20,527
Accrued compensation and benefits	39,346		59,006
Income, real estate, sales and other taxes	29,872		38,297
Other	43,888		42,788
Total accrued expenses	$	187,728	$	219,549

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Tables)

3 Months Ended

Mar. 31, 2015

Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract]

Schedule of condensed consolidating balance sheet

Following is the condensed consolidating balance sheet at March 31, 2015 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	84,881	$	78,608	$	70,250	$	—		$	233,739
Intercompany receivables	141,084		255,080		42,134		(438,298		)	—
Accounts receivable, net	—		388,652		132,911		—			521,563
Other current assets	33		214,784		73,066		—			287,883
Property, plant and equipment, net	—		973,825		528,672		—			1,502,497
Investments in subsidiaries	2,602,744		605,528		—		(3,208,272		)	—
Intercompany debt receivable	—		300,706		3,701		(304,407		)	—
Goodwill	—		324,930		120,482		—			445,412
Permits and other intangibles, net	—		435,343		84,702		—			520,045
Other long-term assets	15,982		13,005		5,916		—			34,903
Total assets	$	2,844,724	$	3,590,461	$	1,061,834	$	(3,950,977	)	$	3,546,042
Liabilities and Stockholders’ Equity:
Current liabilities	$	18,620	$	416,437	$	84,804	$	—		$	519,861
Intercompany payables	264,554		171,792		1,952		(438,298		)	—
Closure, post-closure and remedial liabilities, net	—		153,029		22,712		—			175,741
Long-term obligations	1,395,000		—		—		—			1,395,000
Intercompany debt payable	3,701		—		300,706		(304,407		)	—
Other long-term liabilities	—		246,459		46,132		—			292,591
Total liabilities	1,681,875		987,717		456,306		(742,705		)	2,383,193
Stockholders’ equity	1,162,849		2,602,744		605,528		(3,208,272		)	1,162,849
Total liabilities and stockholders’ equity	$	2,844,724	$	3,590,461	$	1,061,834	$	(3,950,977	)	$	3,546,042

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 (loss) income for the three months ended March 31, 2015 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	418,517		$	193,453		$	(15,640	)	$	596,330
Product revenues	—			116,536			23,204			(3,571		)	136,169
Total revenues	—			535,053			216,657			(19,211		)	732,499
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			277,602			154,428			(15,640		)	416,390
Product cost of revenues	—			115,286			18,402			(3,571		)	130,117
Total cost of revenues	—			392,888			172,830			(19,211		)	546,507
Selling, general and administrative expenses	25			80,984			26,706			—			107,715
Accretion of environmental liabilities	—			2,306			313			—			2,619
Depreciation and amortization	—			45,801			22,555			—			68,356
(Loss) income from operations	(25		)	13,074			(5,747		)	—			7,302
Other income	—			111			298			—			409
Interest (expense) income	(19,639		)	178			23			—			(19,438		)
Equity in earnings of subsidiaries, net of taxes	4,709			(7,029		)	—			2,320			—
Intercompany interest income (expense)	—			5,977			(5,977		)	—			—
(Loss) income before provision for income taxes	(14,955		)	12,311			(11,403		)	2,320			(11,727		)
(Benefit) provision for income taxes	(7,866		)	7,602			(4,374		)	—			(4,638		)
Net (loss) income	(7,089		)	4,709			(7,029		)	2,320			(7,089		)
Other comprehensive loss	(77,403		)	(77,403		)	(50,635		)	128,038			(77,403		)
Comprehensive loss	$	(84,492	)	$	(72,694	)	$	(57,664	)	$	130,358		$	(84,492	)

Following is the consolidating statement of income for the three months ended March 31, 2014 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	445,903		$	218,171		$	(3,979	)	$	660,095
Product revenues	—			135,203			52,494			(1,125		)	186,572
Total revenues	—			581,106			270,665			(5,104		)	846,667
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			306,290			164,488			(3,979		)	466,799
Product cost of revenues	—			115,257			44,788			(1,125		)	158,920
Total cost of revenues	—			421,547			209,276			(5,104		)	625,719
Selling, general and administrative expenses	31			87,575			31,356			—			118,962
Accretion of environmental liabilities	—			2,381			343			—			2,724
Depreciation and amortization	—			42,808			26,548			—			69,356
(Loss) income from operations	(31		)	26,795			3,142			—			29,906
Other income	—			582			3,596			—			4,178
Interest (expense) income	(19,734		)	234			(54		)	—			(19,554		)
Equity in earnings of subsidiaries, net of taxes	20,819			(519		)	—			(20,300		)	—
Intercompany dividend income	—			—			3,100			(3,100		)	—
Intercompany interest income (expense)	—			9,057			(9,057		)	—			—
Income before (benefit) provision for income taxes	1,054			36,149			727			(23,400		)	14,530
(Benefit) provision for income taxes	(7,906		)	15,330			(1,854		)	—			5,570
Net income	8,960			20,819			2,581			(23,400		)	8,960
Other comprehensive (loss) income	(41,525		)	(41,525		)	19,682			21,843			(41,525		)
Comprehensive (loss) income	$	(32,565	)	$	(20,706	)	$	22,263		$	(1,557	)	$	(32,565	)

Schedule of condensed consolidating statement of cash flows

Following is the condensed consolidating statement of cash flows for the three months ended March 31, 2015 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net cash (used in) from operating activities	$	(8,032	)	$	85,311		$	7,498		$	—		$	84,777
Cash flows from investing activities:
Additions to property, plant and equipment	—			(37,670		)	(15,279		)	—			(52,949		)
Proceeds from sales of fixed assets	—			113			647			—			760
Costs to obtain or renew permits	—			—			(1,171		)	—			(1,171		)
Intercompany	—			(108,435		)	—			108,435			—
Net cash used in investing activities	—			(145,992		)	(15,803		)	108,435			(53,360		)
Cash flows from (used in) financing activities:
Change in uncashed checks	—			(14,694		)	(5,574		)	—			(20,268		)
Issuance of restricted shares, net of shares remitted	(1,154		)	—			—			—			(1,154		)
Repurchases of common stock	(15,379		)	—			—			—			(15,379		)
Excess tax benefit of stock-based compensation	5			—			—			—			5
Payments on capital leases	—			(164		)	(234		)	—			(398		)
Intercompany	108,435			—			—			(108,435		)	—
Net cash from (used in) financing activities	91,907			(14,858		)	(5,808		)	(108,435		)	(37,194		)
Effect of exchange rate change on cash	—			—			(7,363		)	—			(7,363		)
Increase (decrease) in cash and cash equivalents	83,875			(75,539		)	(21,476		)	—			(13,140		)
Cash and cash equivalents, beginning of period	1,006			154,147			91,726			—			246,879
Cash and cash equivalents, end of period	$	84,881		$	78,608		$	70,250		$	—		$	233,739

Following is the condensed consolidating statement of cash flows for the three months ended March 31, 2014 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net cash (used in) from operating activities	$	(49,377	)	$	72,813		$	(6,519	)	$	(12,321	)	$	4,596
Cash flows from investing activities:
Additions to property, plant and equipment	—			(46,287		)	(28,718		)	—			(75,005		)
Proceeds from sale of fixed assets	—			228			648			—			876
Costs to obtain or renew permits	—			(111		)	(964		)	—			(1,075		)
Proceeds from sale of long term investments	—			—			12,870			—			12,870
Intercompany	—			(49,094		)	—			49,094			—
Net cash used in investing activities	—			(95,264		)	(16,164		)	49,094			(62,334		)
Cash flows from (used in) financing activities:
Change in uncashed checks	—			60			(39		)	—			21
Proceeds from employee stock purchase plan	2,141			—			—			—			2,141
Issuance of restricted shares, net of shares remitted	(750		)	—			—			—			(750		)
Repurchases of common stock	(1,225		)	—			—			—			(1,225		)
Excess tax benefit of stock-based compensation	117			—			—			—			117
Payments of capital leases	—			(42		)	(596		)	—			(638		)
Dividends (paid) / received	—			(12,321		)	—			12,321			—
Intercompany	49,094			—			—			(49,094		)	—
Net cash from (used in) financing activities	49,377			(12,303		)	(635		)	(36,773		)	(334		)
Effect of exchange rate change on cash	—			—			(2,994		)	—			(2,994		)
Decrease in cash and cash equivalents	—			(34,754		)	(26,312		)	—			(61,066		)
Cash and cash equivalents, beginning of period	1,006			235,505			73,562			—			310,073
Cash and cash equivalents, end of period	$	1,006		$	200,751		$	47,250		$	—		$	249,007

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(LOSS) EARNINGS PER SHARE (Narrative) (Details) (Restricted stock awards)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 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)	539,983	101,059

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UNAUDITED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 233,739	$ 246,879
Accounts receivable, net of allowances aggregating $26,358 and $25,661, respectively	521,563	557,131
Unbilled accounts receivable	33,333	40,775
Deferred costs	18,880	19,018
Inventories and supplies	143,052	168,663
Prepaid expenses and other current assets	56,263	57,435
Deferred tax assets	36,355	36,532
Total current assets	1,043,185	1,126,433
Property, plant and equipment, net	1,502,497	1,558,834
Other assets:
Deferred financing costs	16,761	17,580
Goodwill	445,412	452,669
Permits and other intangibles, net	520,045	530,080
Other	18,142	18,682
Total other assets	1,000,360	1,019,011
Total assets	3,546,042	3,704,278
Current liabilities:
Current portion of capital lease obligations	116	536
Accounts payable	244,216	267,329
Deferred revenue	62,677	62,966
Accrued expenses	187,728	219,549
Current portion of closure, post-closure and remedial liabilities	25,124	22,091
Total current liabilities	519,861	572,471
Other liabilities:
Closure and post-closure liabilities, less current portion of $8,272 and $4,999, respectively	42,848	45,702
Remedial liabilities, less current portion of $16,852 and $17,092, respectively	132,893	138,029
Long-term obligations	1,395,000	1,395,000
Deferred taxes, unrecognized tax benefits and other long-term liabilities	292,591	290,205
Total other liabilities	1,863,332	1,868,936
Commitments and contingent liabilities (See Note 15)
Stockholders’ equity:
Common stock, $.01 par value: Authorized 80,000,000; shares issued and outstanding 58,661,384 and 58,903,482 shares, respectively	587	589
Shares held under employee participation plan	(469)	(469)
Additional paid-in capital	789,501	805,029
Accumulated other comprehensive loss	(188,245)	(110,842)
Accumulated earnings	561,475	568,564
Total stockholders’ equity	1,162,849	1,262,871
Total liabilities and stockholders’ equity	$ 3,546,042	$ 3,704,278

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GOODWILL AND OTHER INTANGIBLE ASSETS (Rollforward of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Goodwill [Roll Forward]
Balance at beginning of year	$ 452,669
Increase from adjustments during the measurement period related to recent acquisitions	3,841
Foreign currency translation	(11,098)
Balance at end of year	$ 445,412

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UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (7,089)	$ 8,960
Other comprehensive loss:
Unrealized gains on available-for-sale securities (net of taxes of $0, $152)	0	860
Reclassification adjustment for gains on available-for-sale securities included in net (loss) income (net of taxes of $0, $496)	0	(2,812)
Foreign currency translation adjustments	(77,403)	(39,573)
Other comprehensive loss	(77,403)	(41,525)
Comprehensive loss	$ (84,492)	$ (32,565)

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STOCK-BASED COMPENSATION (Performance Stock Awards (Details) (Performance stock awards, USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Performance stock awards
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, vested	(6,129)
Number of shares, forfeited	(3,294)
Unvested ending balance	134,452
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	$ 60.94
Fair value, vested	$ 54.28
Fair value, forfeited	$ 61.04
Fair value end of period	$ 61.25
Unrecognized compensation cost	$ 0.3
Fair value restricted stock	$ 0.3	$ 0

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FINANCING ARRANGEMENTS (Tables)

3 Months Ended

Mar. 31, 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):

	March 31, 2015		December 31, 2014
Senior unsecured notes, at 5.25%, due August 1, 2020	$	800,000	$	800,000
Senior unsecured notes, at 5.125%, due June 1, 2021	595,000		595,000
Long-term obligations	$	1,395,000	$	1,395,000

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SEGMENT REPORTING (Total Assets by Geographical Area) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 3,546,042	$ 3,704,278
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	2,528,087	2,572,494
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	1,014,805	1,128,458
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 3,150	$ 3,326

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ACCUMULATED OTHER COMPREHENSIVE LOSS

3 Months Ended

Mar. 31, 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 three months ended March 31, 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	(77,403		)	—			(77,403		)
Other comprehensive loss	$	(77,403	)	$	—		$	(77,403	)
Balance at March 31, 2015	$	(186,292	)	$	(1,953	)	$	(188,245	)

The amounts reclassified out of accumulated other comprehensive loss into the consolidated statement of income, with presentation location during the three months ended March 31, 2015 and March 31, 2014, were as follows (in thousands):

	For the Three Months Ended
Comprehensive Loss Components	March 31, 2015		March 31, 2014			Location
Unrealized gains on available-for-sale investments	$	—	$	(3,308	)	Other income

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(LOSS) EARNINGS PER SHARE (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Reconciliation of basic and diluted earnings per share computations

The following are computations of basic and diluted (loss) earnings per share (in thousands except for per share amounts):

	Three Months Ended
	March 31,
	2015			2014
Numerator for basic and diluted (loss) earnings per share:
Net (loss) income	$	(7,089	)	$	8,960
Denominator:
Basic shares outstanding	58,875			60,720
Dilutive effect of equity-based compensation awards	—			141
Dilutive shares outstanding	58,875			60,861
Basic (loss) earnings per share:	$	(0.12	)	$	0.15
Diluted (loss) earnings per share:	$	(0.12	)	$	0.15

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COMMITMENTS AND CONTINGENCIES

3 Months Ended

Mar. 31, 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 March 31, 2015 and December 31, 2014, the Company had recorded reserves of $29.8 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 March 31, 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 $2.5 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 March 31, 2015 and December 31, 2014, the $29.8 million and $33.6 million, respectively, of reserves consisted of (i) $24.1 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) $5.7 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 March 31, 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 March 31, 2015 and December 31, 2014, the Company had accrued $11.6 million and $12.7 million, respectively, for remedial liabilities relating to the Ville Mercier legal proceedings. The decrease was primarily 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 anyadditional 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 March 31, 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 March 31, 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 an 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 March 31, 2015. From January 1, 2015 to March 31, 2015, 11 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. 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. The settlement must be approved by the court in a fairness hearing, which is anticipated to occur in June 2015. The exact settlement cost is not yet determinable, but it is not expected to 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 127 sites which are subject to or are proposed to become subject to proceedings under federal or state Superfund laws. Of the 127 sites, two (the Wichita Facility and the BR Facility described below) involve facilities that are now owned by the Company and 125 involve third party sites to which either the Company or the prior owners of certain of the Company’s facilities shipped wastes. Of the 125 third party sites, 29 are now settled, 22 are currently requiring expenditures on remediation and 74 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, Clean Harbors believes its potential liability could exceed $100,000 at 12 of the 125 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 which the Company anticipates but cannot guarantee will be available to reimburse certain such cleanup costs.

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 125 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 five 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 16 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 16 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 125 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 March 31, 2015 and December 31, 2014, there were three and four proceedings, respectively, 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 or in the aggregate, not have a material effect on its financial condition, results of operations or cash flows.

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Statements of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Condensed consolidating statement of cash flows
Net cash (used in) from operating activities	$ 84,777	$ 4,596
Cash flows from investing activities:
Additions to property, plant and equipment	(52,949)	(75,005)
Proceeds from sales of fixed assets	760	876
Costs to obtain or renew permits	(1,171)	(1,075)
Proceeds from sale of long term investments		12,870
Intercompany	0
Net cash used in investing activities	(53,360)	(62,334)
Cash flows from financing activities:
Change in uncashed checks	(20,268)	21
Proceeds from employee stock purchase plan	0	2,141
Issuance of restricted shares, net of shares remitted	(1,154)	(750)
Repurchases of common stock	(15,379)	(1,225)
Excess tax benefit of stock-based compensation	5	117
Payments on capital leases	(398)	(638)
Dividends (paid) / received		0
Intercompany	0	0
Net cash from financing activities	(37,194)	(334)
Effect of exchange rate change on cash	(7,363)	(2,994)
Decrease in cash and cash equivalents	(13,140)	(61,066)
Cash and cash equivalents, beginning of period	246,879	310,073
Cash and cash equivalents, end of period	233,739	249,007
Clean Harbors, Inc.
Condensed consolidating statement of cash flows
Net cash (used in) from operating activities	(8,032)	(49,377)
Cash flows from investing activities:
Additions to property, plant and equipment	0	0
Proceeds from sales of fixed assets	0	0
Costs to obtain or renew permits	0	0
Proceeds from sale of long term investments		0
Intercompany	0	0
Net cash used in investing activities	0	0
Cash flows from financing activities:
Change in uncashed checks	0	0
Proceeds from employee stock purchase plan		2,141
Issuance of restricted shares, net of shares remitted	(1,154)	(750)
Repurchases of common stock	(15,379)	(1,225)
Excess tax benefit of stock-based compensation	5	117
Payments on capital leases	0	0
Dividends (paid) / received		0
Intercompany	108,435	49,094
Net cash from financing activities	91,907	49,377
Effect of exchange rate change on cash	0	0
Decrease in cash and cash equivalents	83,875	0
Cash and cash equivalents, beginning of period	1,006	1,006
Cash and cash equivalents, end of period	84,881	1,006
U.S. Guarantor Subsidiaries
Condensed consolidating statement of cash flows
Net cash (used in) from operating activities	85,311	72,813
Cash flows from investing activities:
Additions to property, plant and equipment	(37,670)	(46,287)
Proceeds from sales of fixed assets	113	228
Costs to obtain or renew permits	0	(111)
Proceeds from sale of long term investments		0
Intercompany	(108,435)	(49,094)
Net cash used in investing activities	(145,992)	(95,264)
Cash flows from financing activities:
Change in uncashed checks	(14,694)	60
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
Payments on capital leases	(164)	(42)
Dividends (paid) / received		(12,321)
Intercompany	0	0
Net cash from financing activities	(14,858)	(12,303)
Effect of exchange rate change on cash	0	0
Decrease in cash and cash equivalents	(75,539)	(34,754)
Cash and cash equivalents, beginning of period	154,147	235,505
Cash and cash equivalents, end of period	78,608	200,751
Foreign Non-Guarantor Subsidiaries
Condensed consolidating statement of cash flows
Net cash (used in) from operating activities	7,498	(6,519)
Cash flows from investing activities:
Additions to property, plant and equipment	(15,279)	(28,718)
Proceeds from sales of fixed assets	647	648
Costs to obtain or renew permits	(1,171)	(964)
Proceeds from sale of long term investments		12,870
Intercompany	0	0
Net cash used in investing activities	(15,803)	(16,164)
Cash flows from financing activities:
Change in uncashed checks	(5,574)	(39)
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
Payments on capital leases	(234)	(596)
Dividends (paid) / received		0
Intercompany	0	0
Net cash from financing activities	(5,808)	(635)
Effect of exchange rate change on cash	(7,363)	(2,994)
Decrease in cash and cash equivalents	(21,476)	(26,312)
Cash and cash equivalents, beginning of period	91,726	73,562
Cash and cash equivalents, end of period	70,250	47,250
Consolidating Adjustments
Condensed consolidating statement of cash flows
Net cash (used in) from operating activities		(12,321)
Cash flows from investing activities:
Intercompany	(108,435)	49,094
Net cash used in investing activities	108,435	49,094
Cash flows from financing activities:
Dividends (paid) / received		12,321
Intercompany	(108,435)	(49,094)
Net cash from financing activities	$ (108,435)	$ (36,773)

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UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Unrealized gains (losses) on available-for-sale securities, taxes	$ 0	$ (152)
Reclassification adjustment for gains on available-for-sale securities included in net (loss) income (net of taxes of $0, $496)	$ 0	$ 496

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UNAUDITED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Account Receivable, allowances aggregating	$ 26,358	$ 25,661
Closure and post-closure liabilities, current portion	8,272	4,999
Remedial liabilities, current portion	$ 16,852	$ 17,092
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized shares	80,000,000	80,000,000
Common stock, issued shares	58,661,384	58,903,482
Common stock, outstanding shares	58,661,384	58,903,482

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CLOSURE AND POST-CLOSURE LIABILITIES

3 Months Ended

Mar. 31, 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 three months ended March 31, 2015 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2015	$	29,932		$	20,769		$	50,701
New asset retirement obligations	753			—			753
Accretion	682			496			1,178
Changes in estimates recorded to statement of income	—			(24		)	(24		)
Changes in estimates recorded to balance sheet	(932		)	—			(932		)
Expenditures	(246		)	(19		)	(265		)
Currency translation and other	(196		)	(95		)	(291		)
Balance at March 31, 2015	$	29,993		$	21,127		$	51,120

All of the landfill facilities included in the above were active as of March 31, 2015. New asset retirement obligations incurred during the first three 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.

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DOCUMENT AND ENTITY INFORMATION	3 Months Ended
	Mar. 31, 2015	May 01, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	CLEAN HARBORS INC
Entity Central Index Key	0000822818
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		58,666,636

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REMEDIAL LIABILITIES

3 Months Ended

Mar. 31, 2015

Environmental Remediation Obligations [Abstract]

REMEDIAL LIABILITIES

REMEDIAL LIABILITIES

The changes to remedial liabilities for the three months ended March 31, 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	63			718			660			1,441
Changes in estimates recorded to statement of income	(124		)	27			506			409
Expenditures	(16		)	(1,045		)	(4,278		)	(5,339		)
Currency translation and other	(220		)	(92		)	(1,575		)	(1,887		)
Balance at March 31, 2015	$	5,123		$	68,136		$	76,486		$	149,745

In the three months ended March 31, 2015 there were no significant charges (benefits) resulting from changes in estimates for remedial liabilities.

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UNAUDITED CONSOLIDATED STATEMENTS OF (LOSS) INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues:
Service revenues	$ 596,330	$ 660,095
Product revenues	136,169	186,572
Total revenues	732,499	846,667
Cost of revenues (exclusive of items shown separately below)
Service revenues	416,390	466,799
Product revenues	130,117	158,920
Total cost of revenues	546,507	625,719
Selling, general and administrative expenses	107,715	118,962
Accretion of environmental liabilities	2,619	2,724
Depreciation and amortization	68,356	69,356
Income from operations	7,302	29,906
Other income	409	4,178
Interest expense, net of interest income of $151 and $205, respectively	(19,438)	(19,554)
(Loss) income before (benefit) provision for income taxes	(11,727)	14,530
(Benefit) provision for income taxes	(4,638)	5,570
Net (loss) income	$ (7,089)	$ 8,960
(Loss) earnings per share:
Basic (in USD per share)	$ (0.12)	$ 0.15
Diluted (in USD per share)	$ (0.12)	$ 0.15
Shares used to compute (loss) earnings per share - Basic	58,875	60,720
Shares used to compute (loss) earnings per share - Diluted	58,875	60,861

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BUSINESS COMBINATIONS

3 Months Ended

Mar. 31, 2015

Business Combinations [Abstract]

BUSINESS COMBINATIONS

BUSINESS COMBINATIONS

2015 Acquisitions

On April 11, 2015, the Company acquired Thermo Fluids Inc. for a preliminary purchase price of $85.0 million in cash, subject to customary post-closing adjustments based upon finalized working capital amounts.

2014 Acquisitions

In 2014, the Company acquired the assets of two privately owned companies for approximately $16.1 million in cash, net of cash acquired. The purchase prices are subject to customary post-closing adjustments based upon finalized working capital amounts. The acquired companies have been integrated into the Technical Services and Lodging Services segments.

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SIGNIFICANT ACCOUNTING POLICIES

3 Months Ended

Mar. 31, 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. This new guidance is currently effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2016.

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.

In April 2015, FASB issued ASU 2015-03, Interest - Imputation of Interest (Subtopic 835-30). The amendment provides guidance regarding the simplification of the presentation of debt issuance costs. 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 standard to be implemented will have on the Company's consolidated financial statements.

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STOCK-BASED COMPENSATION

3 Months Ended

Mar. 31, 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 months ended March 31, 2015 and March 31, 2014 was $1.8 million and $2.3 million, respectively. The total income tax benefit recognized in the consolidated statements of income from stock-based compensation was $0.5 million and $0.4 million for the three months ended March 31, 2015 and March 31, 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 three months ended March 31, 2015:

Restricted Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Unvested January 1, 2015	383,021		$	56.51
Granted	58,125		$	53.72
Vested	(59,266	)	$	59.25
Forfeited	(12,349	)	$	56.64
Unvested March 31, 2015	369,531		$	55.63

As of March 31, 2015, there was $14.0 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 3.1 years. The total fair value of restricted stock vested during the three months ended March 31, 2015 and March 31, 2014 was $3.2 million and $2.3 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 three months ended March 31, 2015:

Performance Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Unvested January 1, 2015	143,875		$	60.94
Vested	(6,129	)	$	54.28
Forfeited	(3,294	)	$	61.04
Unvested March 31, 2015	134,452		$	61.25

As of March 31, 2015, there was $0.3 million of total unrecognized compensation cost arising from non-vested performance stock awards deemed probable of vesting under the Company's Plans. The total fair value of performance awards vested during the three months ended March 31, 2015 was $0.3 million. No performance awards vested during the three months ended March 31, 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. As of March 31, 2015, we had repurchased and retired a total of approximately 2.3 million shares of our common stock for approximately $120.5 million under this program. As of March 31, 2015, an additional $179.5 million remains available for repurchase of shares under the current authorized program.

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FINANCING ARRANGEMENTS

3 Months Ended

Mar. 31, 2015

Debt Disclosure [Abstract]

FINANCING ARRANGEMENTS

FINANCING ARRANGEMENTS

The following table is a summary of the Company’s financing arrangements (in thousands):

	March 31, 2015		December 31, 2014
Senior unsecured notes, at 5.25%, due August 1, 2020	$	800,000	$	800,000
Senior unsecured notes, at 5.125%, due June 1, 2021	595,000		595,000
Long-term obligations	$	1,395,000	$	1,395,000

On July 30, 2012, the Company issued through a private placement $800.0 million aggregate principal amount of 5.25% senior unsecured notes due August 1, 2020 ("2020 Notes") with semi-annually fixed interest payments on February 1 and August 1 of each year, which commenced on February 1, 2013. At March 31, 2015 and December 31, 2014, the fair value of the Company's 2020 Notes was $818.0 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.

On December 7, 2012, the Company issued through a private placement $600.0 million aggregate principal amount of 5.125% senior unsecured notes due 2021 ("2021 Notes") with semi-annually fixed interest payments on June 1 and December 1 of each year, which commenced on June 1, 2013. At March 31, 2015 and December 31, 2014, the fair value of the Company's 2021 Notes was $606.9 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 March 31, 2015 and December 31, 2014 had no outstanding loan balances. At March 31, 2015, $209.6 million was available to borrow and outstanding letters of credit were $140.7 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. and its domestic subsidiaries is subject 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 subject 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.

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GOODWILL AND OTHER INTANGIBLE ASSETS

3 Months Ended

Mar. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND OTHER INTANGIBLE ASSETS

GOODWILL AND OTHER INTANGIBLE ASSETS

The changes to goodwill for the three months ended March 31, 2015 were as follows (in thousands):

	2015
Balance at January 1, 2015	$	452,669
Increase from adjustments during the measurement period related to recent acquisitions	3,841
Foreign currency translation	(11,098		)
Balance at March 31, 2015	$	445,412

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 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. As a result of continued lower operating results caused by the depressed economic conditions and lower levels of activity in the Oil and Gas industry primarily in Western Canada, the Company continues to monitor the goodwill in this reporting unit for impairment. During the quarter ended March 31, 2015, the Company evaluated the reporting unit’s performance along with other business specific, and macroeconomic and industry factors. The Company concluded that as of March 31, 2015, no events or changes in circumstances have arisen which would indicate that the fair value of this reporting unit has more likely than not been reduced below its carrying amount. If the Oil & Gas Field Services reporting unit does not achieve the financial performance that the Company expects, it is reasonably possible that an impairment of goodwill may result.  

Below is a summary of amortizable other intangible assets (in thousands):

	March 31, 2015							December 31, 2014
	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)
Permits	$	161,941	$	58,028	$	103,913	18.8	$	156,692	$	55,318	$	101,374	19.0
Customer and supplier relationships	363,681		81,563		282,118		10.9	370,373		77,697		292,676		11.0
Other intangible assets	30,477		19,081		11,396		2.8	31,540		19,074		12,466		3.2
Total amortizable permits and other intangible assets	556,099		158,672		397,427		11.2	558,605		152,089		406,516		11.4
Trademarks and trade names	122,618		—		122,618		Indefinite	123,564		—		123,564		Indefinite
Total permits and other intangible assets	$	678,717	$	158,672	$	520,045		$	682,169	$	152,089	$	530,080

Amortization expense of permits and other intangible assets for the three months ended March 31, 2015 and March 31, 2014 was $11.0 million and $9.5 million, respectively.

Below is the expected future amortization of the net carrying amount of finite-lived intangible assets at March 31, 2015 (in thousands):

Years Ending December 31,	Expected Amortization
2015 (nine months)	$	26,237
2016	34,583
2017	32,437
2018	29,739
2019	26,426
Thereafter	248,005
	$	397,427

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COMMITMENTS AND CONTINGENCIES (Details)	1 Months Ended	3 Months Ended				12 Months Ended					3 Months Ended	12 Months Ended	3 Months Ended
	Oct. 31, 2010 customer	Mar. 31, 2015 USD ($) claims Proceedings	Dec. 31, 2014 USD ($)	Mar. 31, 2015 Legal and Administrative Proceedings USD ($)	Dec. 31, 2014 Legal and Administrative Proceedings USD ($)	Dec. 31, 2012 Ville Mercier CAD	Dec. 31, 1999 Ville Mercier Municipalities	Dec. 31, 1968 Ville Mercier Permits	Mar. 31, 2015 Ville Mercier USD ($)	Dec. 31, 2014 Ville Mercier USD ($)	Mar. 31, 2015 Superfund Proceedings sites facilties	Dec. 31, 2002 Wichita Property acre	Mar. 31, 2015 Certain Other Third Party Sites sites	Mar. 31, 2015 Safety-Kleen sites	Mar. 31, 2015 Federal and State Enforcement Actions USD ($) Proceedings	Dec. 31, 2014 Federal and State Enforcement Actions USD ($) Proceedings
Contingencies [Line Items]
Recorded reserves for actual or probable liabilities		$ 29,800,000	$ 33,600,000	$ 24,100,000	$ 27,700,000										$ 5,700,000	$ 5,900,000
Possible increase in legal and administrative proceedings				2,500,000	2,900,000
Number of permits issued by government, for dumping organic liquid								2
Number of neighboring municipalities filing separate legal proceedings against the Mercier Subsidiary and the Government of Quebec							3
General damages sought						2,900,000
Punitive damages sought						10,000,000
Accrued remedial liabilities		149,745,000	155,121,000						11,600,000	12,700,000
Number of pending personal injury claims allegedly resulting from the used of Safety-Kleen's products		54													3	4
Number of product liability claims settled or dismissed		11
Number of customers filing a complaint	2
Number of sites owned by third party excluded from cleanup or related liabilities											127
Number of sites owned by the entity subject to proceedings under federal or state superfund laws											2
Notices received from owners of third party sites seeking indemnification from the company											125
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											74
Minimum potential liability															$ 100,000	$ 100,000
Number of sites which potential liability could exceed $100,000											12
State-designated superfund site acquired, total acres												1,400
Indemnification agreement with third party sites													11
Notices received from owners of third party sites seeking indemnification from the company											5			16

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INVENTORIES AND SUPPLIES

3 Months Ended

Mar. 31, 2015

Inventory Disclosure [Abstract]

INVENTORIES AND SUPPLIES

INVENTORIES AND SUPPLIES

Inventories and supplies consisted of the following (in thousands):

	March 31, 2015		December 31, 2014
Oil and oil products	$	37,785	$	62,111
Supplies and drums	66,487		68,547
Solvent and solutions	9,627		9,355
Modular camp accommodations	15,441		15,776
Other	13,712		12,874
Total inventories and supplies	$	143,052	$	168,663

As of March 31, 2015 and December 31, 2014, other inventories consist primarily of cleaning fluids, such as absorbents and wipers, and automotive fluids, such as windshield washer fluid and antifreeze.

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PROPERTY, PLANT AND EQUIPMENT

3 Months Ended

Mar. 31, 2015

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consisted of the following (in thousands):

	March 31, 2015		December 31, 2014
Land	$	97,742	$	98,507
Asset retirement costs (non-landfill)	10,812		10,871
Landfill assets	116,889		110,984
Buildings and improvements	334,282		338,242
Camp equipment	163,434		180,575
Vehicles	468,862		471,615
Equipment	1,283,502		1,302,424
Furniture and fixtures	5,379		5,517
Construction in progress	53,086		45,605
	2,533,988		2,564,340
Less - accumulated depreciation and amortization	1,031,491		1,005,506
Total property, plant and equipment, net	$	1,502,497	$	1,558,834

Interest in the amount of $0.2 million and $22.0 thousand was capitalized to fixed assets during the three months ended March 31, 2015 and March 31, 2014, respectively. Depreciation expense, inclusive of landfill amortization was $57.4 million and $59.9 million for the three months ended March 31, 2015 and March 31, 2014, respectively.

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ACCRUED EXPENSES

3 Months Ended

Mar. 31, 2015

Payables and Accruals [Abstract]

ACCRUED EXPENSES

ACCRUED EXPENSES

Accrued expenses consisted of the following (in thousands):

	March 31, 2015		December 31, 2014
Insurance	$	56,992	$	58,931
Interest	17,630		20,527
Accrued compensation and benefits	39,346		59,006
Income, real estate, sales and other taxes	29,872		38,297
Other	43,888		42,788
Total accrued expenses	$	187,728	$	219,549

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SEGMENT REPORTING (Assets by Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 1,502,497	$ 1,558,834
Goodwill	445,412	452,669
Permits and other intangible, net	520,045	530,080
Total assets	3,546,042	3,704,278
Technical Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	423,520	412,323
Goodwill	49,667	50,092
Permits and other intangible, net	77,280	74,870
Total assets	764,557	756,169
Industrial and Field Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	247,136	245,115
Goodwill	107,193	109,214
Permits and other intangible, net	16,814	17,801
Total assets	394,345	392,652
Oil Re-refining and Recycling
Segment Reporting Information [Line Items]
Property, plant and equipment, net	194,767	201,451
Goodwill	50,303	50,883
Permits and other intangible, net	147,598	151,041
Total assets	503,987	538,921
SK Environmental Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	232,072	240,078
Goodwill	171,906	173,873
Permits and other intangible, net	249,003	252,897
Total assets	711,062	731,072
Lodging Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	125,281	141,965
Goodwill	35,030	34,863
Permits and other intangible, net	9,389	10,744
Total assets	206,871	231,782
Oil and Gas Field Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	190,301	215,574
Goodwill	31,313	33,744
Permits and other intangible, net	19,961	22,727
Total assets	323,265	361,223
Corporate Items
Segment Reporting Information [Line Items]
Property, plant and equipment, net	89,420	102,328
Goodwill	0	0
Permits and other intangible, net	0	0
Total assets	$ 641,955	$ 692,459

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
ASSETS
Cash and cash equivalents	$ 233,739	$ 246,879	$ 249,007	$ 310,073
Intercompany receivables	0	0
Accounts receivable, net	521,563	557,131
Other current assets	287,883	322,423
Property, plant and equipment, net	1,502,497	1,558,834
Investments in subsidiaries	0	0
Intercompany debt receivable	0	0
Goodwill	445,412	452,669
Permits and other intangibles, net	520,045	530,080
Other long-term assets	34,903	36,262
Total assets	3,546,042	3,704,278
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	519,861	572,471
Intercompany payables	0	0
Closure, post-closure and remedial liabilities, net	175,741	183,731
Long-term obligations	1,395,000	1,395,000
Intercompany debt payable	0	0
Other long-term liabilities	292,591	290,205
Total liabilities	2,383,193	2,441,407
Stockholders’ equity	1,162,849	1,262,871
Total liabilities and stockholders’ equity	3,546,042	3,704,278
Clean Harbors, Inc.
ASSETS
Cash and cash equivalents	84,881	1,006	1,006	1,006
Intercompany receivables	141,084	133,219
Accounts receivable, net	0	0
Other current assets	33	0
Property, plant and equipment, net	0	0
Investments in subsidiaries	2,602,744	2,694,727
Intercompany debt receivable	0	0
Goodwill	0	0
Permits and other intangibles, net	0	0
Other long-term assets	15,982	16,801
Total assets	2,844,724	2,845,753
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	18,620	20,820
Intercompany payables	264,554	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	1,681,875	1,582,882
Stockholders’ equity	1,162,849	1,262,871
Total liabilities and stockholders’ equity	2,844,724	2,845,753
U.S. Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	78,608	154,147	200,751	235,505
Intercompany receivables	255,080	156,920
Accounts receivable, net	388,652	414,205
Other current assets	214,784	241,232
Property, plant and equipment, net	973,825	970,757
Investments in subsidiaries	605,528	663,191
Intercompany debt receivable	300,706	327,634
Goodwill	324,930	324,930
Permits and other intangibles, net	435,343	435,906
Other long-term assets	13,005	12,959
Total assets	3,590,461	3,701,881
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	416,437	444,059
Intercompany payables	171,792	164,231
Closure, post-closure and remedial liabilities, net	153,029	158,622
Long-term obligations	0	0
Intercompany debt payable	0	0
Other long-term liabilities	246,459	240,242
Total liabilities	987,717	1,007,154
Stockholders’ equity	2,602,744	2,694,727
Total liabilities and stockholders’ equity	3,590,461	3,701,881
Foreign Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	70,250	91,726	47,250	73,562
Intercompany receivables	42,134	39,724
Accounts receivable, net	132,911	142,926
Other current assets	73,066	81,191
Property, plant and equipment, net	528,672	588,077
Investments in subsidiaries	0	0
Intercompany debt receivable	3,701	3,701
Goodwill	120,482	127,739
Permits and other intangibles, net	84,702	94,174
Other long-term assets	5,916	6,502
Total assets	1,061,834	1,175,760
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	84,804	107,592
Intercompany payables	1,952	2,271
Closure, post-closure and remedial liabilities, net	22,712	25,109
Long-term obligations	0	0
Intercompany debt payable	300,706	327,634
Other long-term liabilities	46,132	49,963
Total liabilities	456,306	512,569
Stockholders’ equity	605,528	663,191
Total liabilities and stockholders’ equity	1,061,834	1,175,760
Consolidating Adjustments
ASSETS
Cash and cash equivalents	0	0
Intercompany receivables	(438,298)	(329,863)
Accounts receivable, net	0	0
Other current assets	0	0
Property, plant and equipment, net	0	0
Investments in subsidiaries	(3,208,272)	(3,357,918)
Intercompany debt receivable	(304,407)	(331,335)
Goodwill	0	0
Permits and other intangibles, net	0	0
Other long-term assets	0	0
Total assets	(3,950,977)	(4,019,116)
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	0	0
Intercompany payables	(438,298)	(329,863)
Closure, post-closure and remedial liabilities, net	0	0
Long-term obligations	0	0
Intercompany debt payable	(304,407)	(331,335)
Other long-term liabilities	0	0
Total liabilities	(742,705)	(661,198)
Stockholders’ equity	(3,208,272)	(3,357,918)
Total liabilities and stockholders’ equity	$ (3,950,977)	$ (4,019,116)

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SEGMENT REPORTING (Adjusted EBITDA Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	$ 78,277	$ 101,986
Accretion of environmental liabilities	2,619	2,724
Depreciation and amortization	68,356	69,356
Income from operations	7,302	29,906
Other income	(409)	(4,178)
Interest expense, net of interest income	19,438	19,554
(Loss) income before (benefit) provision for income taxes	(11,727)	14,530
Technical Services
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	63,401	62,177
Industrial and Field Services
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	10,309	16,372
Oil Re-refining and Recycling
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	(4,476)	12,583
SK Environmental Services
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	27,249	22,825
Lodging Services
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	6,910	17,737
Oil and Gas Field Services
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	1,403	16,331
Corporate Items
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	$ (26,519)	$ (46,039)

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REMEDIAL LIABILITIES (Tables)

3 Months Ended

Mar. 31, 2015

Environmental Remediation Obligations [Abstract]

Changes to remedial liabilities

The changes to remedial liabilities for the three months ended March 31, 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	63			718			660			1,441
Changes in estimates recorded to statement of income	(124		)	27			506			409
Expenditures	(16		)	(1,045		)	(4,278		)	(5,339		)
Currency translation and other	(220		)	(92		)	(1,575		)	(1,887		)
Balance at March 31, 2015	$	5,123		$	68,136		$	76,486		$	149,745

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FINANCING ARRANGEMENTS (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Jul. 30, 2012	Dec. 07, 2012
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	209,600,000	238,400,000
Letters of credit amount outstanding	140,700,000	134,500,000
Unsecured debt | Unsecured senior notes 2020
Financing arrangements
Senior unsecured notes	800,000,000	800,000,000
Senior unsecured notes principal amount			800,000,000.0
Stated interest rate	5.25%	5.25%	5.25%
Fair value	818,000,000	804,000,000
Unsecured debt | Unsecured senior notes 2021
Financing arrangements
Senior unsecured notes	595,000,000	595,000,000
Senior unsecured notes principal amount				600,000,000.0
Stated interest rate	5.125%	5.125%		5.125%
Fair value	606,900,000	$ 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%

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(LOSS) EARNINGS PER SHARE

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

(LOSS) EARNINGS PER SHARE

(LOSS) EARNINGS PER SHARE

The following are computations of basic and diluted (loss) earnings per share (in thousands except for per share amounts):

	Three Months Ended
	March 31,
	2015			2014
Numerator for basic and diluted (loss) earnings per share:
Net (loss) income	$	(7,089	)	$	8,960
Denominator:
Basic shares outstanding	58,875			60,720
Dilutive effect of equity-based compensation awards	—			141
Dilutive shares outstanding	58,875			60,861
Basic (loss) earnings per share:	$	(0.12	)	$	0.15
Diluted (loss) earnings per share:	$	(0.12	)	$	0.15

As a result of the net loss reported for the three months ended March 31, 2015, all outstanding stock options, restricted stock awards and performance awards totaling 539,983 were excluded from the calculation of diluted earnings per share as their inclusion would have an antidilutive effect. For the three months ended March 31, 2014, the dilutive effect of all then outstanding options, restricted stock and performance awards is included in the EPS calculations above except for 101,059 of outstanding performance stock awards for which the performance criteria were not attained at that time.

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION

3 Months Ended

Mar. 31, 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 March 31, 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 March 31, 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 March 31, 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 March 31, 2015 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	84,881	$	78,608	$	70,250	$	—		$	233,739
Intercompany receivables	141,084		255,080		42,134		(438,298		)	—
Accounts receivable, net	—		388,652		132,911		—			521,563
Other current assets	33		214,784		73,066		—			287,883
Property, plant and equipment, net	—		973,825		528,672		—			1,502,497
Investments in subsidiaries	2,602,744		605,528		—		(3,208,272		)	—
Intercompany debt receivable	—		300,706		3,701		(304,407		)	—
Goodwill	—		324,930		120,482		—			445,412
Permits and other intangibles, net	—		435,343		84,702		—			520,045
Other long-term assets	15,982		13,005		5,916		—			34,903
Total assets	$	2,844,724	$	3,590,461	$	1,061,834	$	(3,950,977	)	$	3,546,042
Liabilities and Stockholders’ Equity:
Current liabilities	$	18,620	$	416,437	$	84,804	$	—		$	519,861
Intercompany payables	264,554		171,792		1,952		(438,298		)	—
Closure, post-closure and remedial liabilities, net	—		153,029		22,712		—			175,741
Long-term obligations	1,395,000		—		—		—			1,395,000
Intercompany debt payable	3,701		—		300,706		(304,407		)	—
Other long-term liabilities	—		246,459		46,132		—			292,591
Total liabilities	1,681,875		987,717		456,306		(742,705		)	2,383,193
Stockholders’ equity	1,162,849		2,602,744		605,528		(3,208,272		)	1,162,849
Total liabilities and stockholders’ equity	$	2,844,724	$	3,590,461	$	1,061,834	$	(3,950,977	)	$	3,546,042

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 (loss) income for the three months ended March 31, 2015 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	418,517		$	193,453		$	(15,640	)	$	596,330
Product revenues	—			116,536			23,204			(3,571		)	136,169
Total revenues	—			535,053			216,657			(19,211		)	732,499
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			277,602			154,428			(15,640		)	416,390
Product cost of revenues	—			115,286			18,402			(3,571		)	130,117
Total cost of revenues	—			392,888			172,830			(19,211		)	546,507
Selling, general and administrative expenses	25			80,984			26,706			—			107,715
Accretion of environmental liabilities	—			2,306			313			—			2,619
Depreciation and amortization	—			45,801			22,555			—			68,356
(Loss) income from operations	(25		)	13,074			(5,747		)	—			7,302
Other income	—			111			298			—			409
Interest (expense) income	(19,639		)	178			23			—			(19,438		)
Equity in earnings of subsidiaries, net of taxes	4,709			(7,029		)	—			2,320			—
Intercompany interest income (expense)	—			5,977			(5,977		)	—			—
(Loss) income before provision for income taxes	(14,955		)	12,311			(11,403		)	2,320			(11,727		)
(Benefit) provision for income taxes	(7,866		)	7,602			(4,374		)	—			(4,638		)
Net (loss) income	(7,089		)	4,709			(7,029		)	2,320			(7,089		)
Other comprehensive loss	(77,403		)	(77,403		)	(50,635		)	128,038			(77,403		)
Comprehensive loss	$	(84,492	)	$	(72,694	)	$	(57,664	)	$	130,358		$	(84,492	)

Following is the consolidating statement of income for the three months ended March 31, 2014 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	445,903		$	218,171		$	(3,979	)	$	660,095
Product revenues	—			135,203			52,494			(1,125		)	186,572
Total revenues	—			581,106			270,665			(5,104		)	846,667
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			306,290			164,488			(3,979		)	466,799
Product cost of revenues	—			115,257			44,788			(1,125		)	158,920
Total cost of revenues	—			421,547			209,276			(5,104		)	625,719
Selling, general and administrative expenses	31			87,575			31,356			—			118,962
Accretion of environmental liabilities	—			2,381			343			—			2,724
Depreciation and amortization	—			42,808			26,548			—			69,356
(Loss) income from operations	(31		)	26,795			3,142			—			29,906
Other income	—			582			3,596			—			4,178
Interest (expense) income	(19,734		)	234			(54		)	—			(19,554		)
Equity in earnings of subsidiaries, net of taxes	20,819			(519		)	—			(20,300		)	—
Intercompany dividend income	—			—			3,100			(3,100		)	—
Intercompany interest income (expense)	—			9,057			(9,057		)	—			—
Income before (benefit) provision for income taxes	1,054			36,149			727			(23,400		)	14,530
(Benefit) provision for income taxes	(7,906		)	15,330			(1,854		)	—			5,570
Net income	8,960			20,819			2,581			(23,400		)	8,960
Other comprehensive (loss) income	(41,525		)	(41,525		)	19,682			21,843			(41,525		)
Comprehensive (loss) income	$	(32,565	)	$	(20,706	)	$	22,263		$	(1,557	)	$	(32,565	)

Following is the condensed consolidating statement of cash flows for the three months ended March 31, 2015 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net cash (used in) from operating activities	$	(8,032	)	$	85,311		$	7,498		$	—		$	84,777
Cash flows from investing activities:
Additions to property, plant and equipment	—			(37,670		)	(15,279		)	—			(52,949		)
Proceeds from sales of fixed assets	—			113			647			—			760
Costs to obtain or renew permits	—			—			(1,171		)	—			(1,171		)
Intercompany	—			(108,435		)	—			108,435			—
Net cash used in investing activities	—			(145,992		)	(15,803		)	108,435			(53,360		)
Cash flows from (used in) financing activities:
Change in uncashed checks	—			(14,694		)	(5,574		)	—			(20,268		)
Issuance of restricted shares, net of shares remitted	(1,154		)	—			—			—			(1,154		)
Repurchases of common stock	(15,379		)	—			—			—			(15,379		)
Excess tax benefit of stock-based compensation	5			—			—			—			5
Payments on capital leases	—			(164		)	(234		)	—			(398		)
Intercompany	108,435			—			—			(108,435		)	—
Net cash from (used in) financing activities	91,907			(14,858		)	(5,808		)	(108,435		)	(37,194		)
Effect of exchange rate change on cash	—			—			(7,363		)	—			(7,363		)
Increase (decrease) in cash and cash equivalents	83,875			(75,539		)	(21,476		)	—			(13,140		)
Cash and cash equivalents, beginning of period	1,006			154,147			91,726			—			246,879
Cash and cash equivalents, end of period	$	84,881		$	78,608		$	70,250		$	—		$	233,739

Following is the condensed consolidating statement of cash flows for the three months ended March 31, 2014 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net cash (used in) from operating activities	$	(49,377	)	$	72,813		$	(6,519	)	$	(12,321	)	$	4,596
Cash flows from investing activities:
Additions to property, plant and equipment	—			(46,287		)	(28,718		)	—			(75,005		)
Proceeds from sale of fixed assets	—			228			648			—			876
Costs to obtain or renew permits	—			(111		)	(964		)	—			(1,075		)
Proceeds from sale of long term investments	—			—			12,870			—			12,870
Intercompany	—			(49,094		)	—			49,094			—
Net cash used in investing activities	—			(95,264		)	(16,164		)	49,094			(62,334		)
Cash flows from (used in) financing activities:
Change in uncashed checks	—			60			(39		)	—			21
Proceeds from employee stock purchase plan	2,141			—			—			—			2,141
Issuance of restricted shares, net of shares remitted	(750		)	—			—			—			(750		)
Repurchases of common stock	(1,225		)	—			—			—			(1,225		)
Excess tax benefit of stock-based compensation	117			—			—			—			117
Payments of capital leases	—			(42		)	(596		)	—			(638		)
Dividends (paid) / received	—			(12,321		)	—			12,321			—
Intercompany	49,094			—			—			(49,094		)	—
Net cash from (used in) financing activities	49,377			(12,303		)	(635		)	(36,773		)	(334		)
Effect of exchange rate change on cash	—			—			(2,994		)	—			(2,994		)
Decrease in cash and cash equivalents	—			(34,754		)	(26,312		)	—			(61,066		)
Cash and cash equivalents, beginning of period	1,006			235,505			73,562			—			310,073
Cash and cash equivalents, end of period	$	1,006		$	200,751		$	47,250		$	—		$	249,007

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CLOSURE AND POST-CLOSURE LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Changes to post-closure liabilities
Balance at beginning of year	$ 50,701
New asset retirement obligations	753
Accretion	1,178
Changes in estimates recorded to statement of income	(24)
Changes in estimates recorded to balance sheet	(932)
Expenditures	(265)
Currency translation and other	(291)
Balance at end of year	51,120
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
New asset retirement obligations	753
Accretion	682
Changes in estimates recorded to statement of income	0
Changes in estimates recorded to balance sheet	(932)
Expenditures	(246)
Currency translation and other	(196)
Balance at end of year	29,993
Non-Landfill Retirement Liability
Changes to post-closure liabilities
Balance at beginning of year	20,769
New asset retirement obligations	0
Accretion	496
Changes in estimates recorded to statement of income	(24)
Changes in estimates recorded to balance sheet	0
Expenditures	(19)
Currency translation and other	(95)
Balance at end of year	$ 21,127

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BASIS OF PRESENTATION (Narrative) (Details)	3 Months Ended
	Mar. 31, 2015 segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments	6

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UNAUDITED CONSOLIDATED STATEMENTS OF (LOSS) INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Interest income	$ 151	$ 205

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BASIS OF PRESENTATION

3 Months Ended

Mar. 31, 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.

Reclassifications

During the second quarter of 2014, the Company made changes to the manner in which it manages the business, makes operating decisions and assesses performance. These changes included the reassignment of certain departments among the Company's operating segments in line with management reporting changes as well as the identification of Lodging Services as an additional segment. Under the new structure, the Company's operations are managed in six reportable segments: Technical Services, Industrial and Field Services, Oil Re-refining and Recycling, SK Environmental Services, Lodging Services and Oil and Gas Field Services. The amounts presented for all periods herein have been recast to reflect the impact of such changes. These reclassifications and adjustments had no effect on consolidated net income, comprehensive income, cash flows or stockholders' equity for any of the periods presented.

During the third quarter of 2014, the Company aggregated the cash flow effects of the change in unbilled receivables with the change from accounts receivable in the Consolidated Statements of Cash Flows. Previously the cash flow effect of the change in unbilled receivables was aggregated with changes in other current assets. Prior year amounts have been recast to conform to the current year presentation.

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STOCK-BASED COMPENSATION (Restricted Stock) (Details) (Restricted stock awards, USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Restricted stock awards
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	58,125
Number of shares, vested	(59,266)
Number of shares, forfeited	(12,349)
Unvested ending balance	369,531
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	$ 56.51
Fair value, granted	$ 53.72
Fair value, vested	$ 59.25
Fair value, forfeited	$ 56.64
Fair value end of period	$ 55.63
Unrecognized compensation cost	$ 14.0
Period recognized	3 years 1 month
Fair value restricted stock	$ 3.2	$ 2.3

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SUBSEQUENT EVENTS

3 Months Ended

Mar. 31, 2015

Subsequent Events [Abstract]

Subsequent Events

SUBSEQUENT EVENTS

On May 6, 2015, the Company announced that it has expanded its planned carve-out to include the entire Lodging Services segment. The Company previously announced that it intended to include only the drilling-related mobile assets as part of the expected standalone public entity, along with the Oil and Gas Field Services segment. Timing could take more than 12 months and completion of the carve-out is subject to certain conditions including, but not limited to, market conditions, determination of the most advantageous structure from a financial and tax standpoint, overall costs to our Company, receipt of regulatory approvals, compliance with our debt covenants, the effectiveness of securities laws filings and final approval by our board of directors. There can be no assurance regarding the ultimate structure and timing of the proposed transaction or whether the transaction will be completed.

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STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 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 three months ended March 31, 2015:

Restricted Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Unvested January 1, 2015	383,021		$	56.51
Granted	58,125		$	53.72
Vested	(59,266	)	$	59.25
Forfeited	(12,349	)	$	56.64
Unvested March 31, 2015	369,531		$	55.63

Summary of performance stock awards

The following table summarizes information about performance stock awards for the three months ended March 31, 2015:

Performance Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Unvested January 1, 2015	143,875		$	60.94
Vested	(6,129	)	$	54.28
Forfeited	(3,294	)	$	61.04
Unvested March 31, 2015	134,452		$	61.25

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INCOME TAXES

3 Months Ended

Mar. 31, 2015

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

The Company’s effective tax rate for the three months ended March 31, 2015 was 39.5% compared to 38.3% for the same period in 2014. The increase in the effective rates for the three months ended March 31, 2015 is primarily due to the benefit realized from the release of an uncertain tax position that was recorded in the first quarter of 2015.

As of March 31, 2015 and December 31, 2014, the Company had recorded $2.3 million and $2.5 million, respectively, of liabilities for unrecognized tax benefits and $0.4 million of interest, respectively.

Due to expiring statute of limitation periods, the Company believes that total unrecognized tax benefits will decrease by approximately $0.6 million within the next 12 months. This is the result of an audit settlement for one of our foreign entities.