Clean Harbors (CLH) 10-K3 Mar 142013 FY Annual reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information Document (USD $)	12 Months Ended
In Billions, except Share data, unless otherwise specified	Dec. 31, 2013	Feb. 26, 2014	Jun. 28, 2013
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-K	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Amendment Flag	'false	'	'
Entity Common Stock, Shares Outstanding	'	60,723,422	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Public Float	'	'	$2.80

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:	'	'
Cash and cash equivalents	$310,073	$229,836
Marketable securities	12,435	11,778
Accounts receivable, net of allowances aggregating $18,106 and $11,125, respectively	579,394	546,136
Unbilled accounts receivable	26,568	27,072
Deferred costs	16,134	6,888
Inventories and supplies	152,096	176,478
Prepaid expenses and other current assets	41,962	75,765
Deferred tax assets	32,517	21,306
Total current assets	1,171,179	1,095,259
Property, plant and equipment, net	1,602,170	1,533,053
Other assets:	'	'
Deferred financing costs	20,860	21,657
Goodwill	570,960	579,715
Permits and other intangibles, net	569,973	590,044
Other	18,536	18,358
Total other assets	1,180,329	1,209,774
Total assets	3,953,678	3,838,086
Current liabilities:	'	'
Current portion of capital lease obligations	1,329	5,092
Accounts payable	316,462	257,911
Deferred revenue	55,454	50,973
Accrued expenses	236,829	246,354
Current portion of closure, post-closure and remedial liabilities	29,471	28,336
Total current liabilities	639,545	588,666
Other liabilities:	'	'
Closure and post-closure liabilities, less current portion of $5,884 and $8,791, respectively	41,201	35,256
Remedial liabilities, less current portion of $23,587 and $19,545, respectively	148,911	163,801
Long-term obligations	1,400,000	1,400,000
Capital lease obligations, less current portion	1,435	2,879
Deferred taxes, unrecognized tax benefits and other long-term liabilities	246,947	215,412
Total other liabilities	1,838,494	1,817,348
Commitments and contingent liabilities	'	'
Stockholders' equity:	'	'
Authorized 80,000,000 shares; issued and outstanding 60,672,180 and 60,385,453 shares, respectively	607	604
Shares held under employee participation plan	-469	-469
Additional paid-in capital	898,165	880,979
Accumulated other comprehensive (loss) income	-19,556	49,632
Accumulated earnings	596,892	501,326
Total stockholders' equity	1,475,639	1,432,072
Total liabilities and stockholders' equity	$3,953,678	$3,838,086

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]	'	'
Account Receivable, allowances aggregating	$18,106	$11,125
Closure and post-closure liabilities, current portion	5,884	8,791
Remedial liabilities, current portion	$23,587	$19,545
Common stock, par value (in dollars per share)	$0.01	$0.01
Common stock, authorized shares	80,000,000	80,000,000
Common stock, issued shares	60,672,180	60,385,453
Common stock, outstanding shares	60,672,180	60,385,453

CONSOLIDATED_STATEMENTS_OF_INC

CONSOLIDATED STATEMENTS OF INCOME (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:	'	'	'	'	'	'	'	'	'	'	'
Service revenues	'	'	'	'	'	'	'	'	$2,729,205	$2,063,160	$1,882,979
Product revenues	'	'	'	'	'	'	'	'	780,451	124,748	101,157
Total revenues	879,430	907,535	860,528	862,163	558,962	533,806	523,118	572,022	3,509,656	2,187,908	1,984,136
Cost of revenues: (exclusive of items shown separately below)	'	'	'	'	'	'	'	'	'	'	'
Service revenues	'	'	'	'	'	'	'	'	1,874,448	1,439,594	1,301,363
Product revenues	'	'	'	'	'	'	'	'	668,185	101,027	78,628
Total cost of revenues	645,164	647,119	614,326	636,024	399,743	372,940	367,623	400,315	2,542,633	1,540,621	1,379,991
Selling, general and administrative expenses	'	'	'	'	'	'	'	'	470,477	273,520	254,137
Accretion of environmental liabilities	'	'	'	'	'	'	'	'	11,541	9,917	9,680
Depreciation and amortization	'	'	'	'	'	'	'	'	264,449	161,646	122,663
Income from operations	58,877	73,608	53,243	34,828	36,231	56,739	47,533	61,701	220,556	202,204	217,665
Other income (expense)	-325	-150	1,655	525	-337	-91	-75	-299	1,705	-802	6,402
Loss on early extinguishment of debt	'	'	'	'	'	'	'	'	0	-26,385	0
Interest expense, net of interest income of $507, $846, and $798, respectively	'	'	'	'	'	'	'	'	-78,376	-47,287	-39,389
Income before provision (benefit) for income taxes	'	'	'	'	'	'	'	'	143,885	127,730	184,678
Provision (benefit) for income taxes	'	'	'	'	'	'	'	'	48,319	-1,944	57,426
Net income	$26,801	$35,361	$22,902	$10,502	$61,874	$12,359	$23,426	$32,015	$95,566	$129,674	$127,252
Earnings per share:	'	'	'	'	'	'	'	'	'	'	'
Basic (in dollars per share)	$0.44	$0.58	$0.38	$0.17	$1.11	$0.23	$0.44	$0.60	$1.58	$2.41	$2.40
Diluted (in dollars per share)	$0.44	$0.58	$0.38	$0.17	$1.11	$0.23	$0.44	$0.60	$1.57	$2.40	$2.39
Shares used to compute earnings per share b Basic	'	'	'	'	'	'	'	'	60,574	53,884	52,961
Shares used to compute earnings per share b Diluted	'	'	'	'	'	'	'	'	60,728	54,079	53,324

CONSOLIDATED_STATEMENTS_OF_INC1

CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Investment Income, Interest	$507	$846	$798

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]	'	'	'
Net income	$95,566	$129,674	$127,252
Other comprehensive (loss) income:	'	'	'
Unrealized gains on available-for-sale securities (net of taxes of $208, $177 and $174, respectively)	1,244	1,008	686
Reclassification adjustment for gains on available-for-sale securities included in net income (net of taxes of $379)	0	0	-1,493
Foreign currency translation adjustments	-70,791	17,925	-18,264
Unfunded pension liability (net of taxes of $123, $231 and $58, respectively)	359	-654	-335
Other comprehensive (loss) income	-69,188	18,279	-19,406
Comprehensive income	$26,378	$147,953	$107,846

CONSOLIDATED_STATEMENTS_OF_COM1

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]	'	'	'
Unrealized gains on available-for-sale securities, taxes	$208	$177	$174
Reclassification adjustment for gains on available-for-sale securities included in net income, taxes	0	0	379
Unfunded pension liability, taxes	$123	$231	$58

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:	'	'	'
Net income	$95,566	$129,674	$127,252
Adjustments to reconcile net income to net cash from operating activities:	'	'	'
Depreciation and amortization	264,449	161,646	122,663
Pre-tax, non-cash acquisition accounting inventory adjustments	13,559	0	0
Allowance for doubtful accounts	7,933	1,213	759
Amortization of deferred financing costs and debt discount	3,301	1,793	1,572
Accretion of environmental liabilities	11,541	9,917	9,680
Changes in environmental liability estimates	-3,682	-8,458	-2,840
Deferred income taxes	31,119	34,163	37,836
Other (income) expense	-1,705	802	-3,048
Stock-based compensation	8,946	7,494	8,164
Excess tax benefit of stock-based compensation	-1,409	-2,556	-3,352
Income tax benefit related to stock option exercises	1,399	2,546	3,347
Write-off of deferred financing costs and debt (premium) discount	0	5,341	0
Environmental expenditures	-19,416	-11,191	-11,319
Changes in assets and liabilities:	'	'	'
Accounts receivable	-53,735	54,373	-65,210
Inventories and supplies	-1,144	-12,871	-11,696
Other current assets	20,379	9,334	-25,065
Accounts payable	37,117	5,930	-8,116
Other current and long-term liabilities	1,621	-64,785	-1,096
Net cash from operating activities	415,839	324,365	179,531
Cash flows from investing activities:	'	'	'
Additions to property, plant and equipment	-280,207	-197,397	-148,513
Proceeds from sales of fixed assets	4,699	8,125	6,794
Acquisitions, net of cash acquired	-63,264	-1,373,921	-336,960
Additions to intangible assets including costs to obtain or renew permits	-6,740	-4,046	-2,927
Purchase of marketable securities	0	-10,517	0
Proceeds from sales of marketable securities	0	0	425
Proceeds from sale of long-term investments	0	0	1,000
Other	0	5,120	0
Net cash used in investing activities	-345,512	-1,572,636	-480,181
Cash flows from financing activities:	'	'	'
Change in uncashed checks	12,268	-12,070	9,822
Proceeds from exercise of stock options	400	288	1,350
Remittance of shares, net	-731	-2,912	-4,061
Excess tax benefit of stock-based compensation	1,409	2,556	3,352
Deferred financing costs paid	-2,504	-19,056	-8,463
Proceeds from employee stock purchase plan	7,425	6,196	3,516
Payments on capital leases	-4,891	-6,599	-7,837
Proceeds from issuance of common stock, net	0	369,520	0
Principal payments on debt	0	-520,000	0
Distribution of cash earned on employee participation plan	0	-55	-189
Issuance of senior unsecured notes, at par	0	1,400,000	0
Issuance of senior secured notes, including premium	0	0	261,250
Issuance costs related to issuances of common stock	-250	0	0
Net cash from financing activities	13,126	1,217,868	258,740
Effect of exchange rate change on cash	-3,216	-484	423
Increase (decrease) in cash and cash equivalents	80,237	-30,887	-41,487
Cash and cash equivalents, beginning of year	229,836	260,723	302,210
Cash and cash equivalents, end of year	310,073	229,836	260,723
Cash payments for interest and income taxes:	'	'	'
Interest paid	75,627	41,817	31,201
Income taxes (received) paid	-8,162	13,179	48,725
Non-cash investing and financing activities:	'	'	'
Property, plant and equipment accrued	33,214	29,788	18,682
Transfer of inventory to property, plant and equipment	11,369	0	0
Accrued working capital adjustments	0	-750	3,694
Assets acquired through capital lease	$0	$154	$1,807

CONSOLIDATED_STATEMENTS_OF_STO

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)	Total	Common Stock	Treasury Stock	Shares Held Under Employee Participation Plan	Additional Paid-in Capital	Accumulated Other Comprehensive Income (loss)	Accumulated Earnings
In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Treasury Stock	Shares Held Under Employee Participation Plan	Additional Paid-in Capital	Accumulated Other Comprehensive Income (loss)	Accumulated Earnings
Balance at Dec. 31, 2010	$780,827	$528	($2,467)	($777)	$488,384	$50,759	$244,400
Balance (in shares) at Dec. 31, 2010	'	52,772,000	'	'	'	'	'
Increase (Decrease) in Stockholders' Equity	'	'	'	'	'	'	'
Net income	127,252	'	'	'	'	'	127,252
Elimination of treasury stock	'	'	2,467	'	-2,467	'	'
Other comprehensive income (loss)	-19,406	'	'	'	'	-19,406	'
Stock-based compensation	7,854	'	'	'	7,854	'	'
Stock-based compensation (in shares)	'	322,000	'	'	'	'	'
Issuance of restricted shares, net of shares remitted	-4,061	'	'	'	-4,061	'	'
Issuance of restricted shares, net of shares remitted (in shares)	'	-76,000	'	'	'	'	'
Shares held under employee participation plan	308	'	'	308	'	'	'
Exercise of stock options	1,350	4	'	'	1,346	'	'
Exercise of stock options (in shares)	'	71,000	'	'	'	'	'
Net tax benefit on exercise of stock-based awards	3,347	'	'	'	3,347	'	'
Employee stock purchase plan	3,516	'	'	'	3,516	'	'
Employee stock purchase plan (in shares)	'	94,000	'	'	'	'	'
Balance at Dec. 31, 2011	900,987	532	0	-469	497,919	31,353	371,652
Balance (in shares) at Dec. 31, 2011	'	53,183,000	'	'	'	'	'
Increase (Decrease) in Stockholders' Equity	'	'	'	'	'	'	'
Net income	129,674	'	'	'	'	'	129,674
Other comprehensive income (loss)	18,279	'	'	'	'	18,279	'
Stock-based compensation	7,494	'	'	'	7,494	'	'
Stock-based compensation (in shares)	'	168,000	'	'	'	'	'
Issuance of restricted shares, net of shares remitted	-2,912	'	'	'	-2,912	'	'
Issuance of restricted shares, net of shares remitted (in shares)	'	-48,000	'	'	'	'	'
Issuance of common stock, net of issuance costs	369,520	69	'	'	369,451	'	'
Issuance of common stock, net of issuance costs (in shares)	'	6,900,000	'	'	'	'	'
Exercise of stock options	288	3	'	'	285	'	'
Exercise of stock options (in shares)	'	47,000	'	'	'	'	'
Net tax benefit on exercise of stock-based awards	2,546	'	'	'	2,546	'	'
Employee stock purchase plan	6,196	'	'	'	6,196	'	'
Employee stock purchase plan (in shares)	'	135,000	'	'	'	'	'
Balance at Dec. 31, 2012	1,432,072	604	0	-469	880,979	49,632	501,326
Balance (in shares) at Dec. 31, 2012	'	60,385,000	'	'	'	'	'
Increase (Decrease) in Stockholders' Equity	'	'	'	'	'	'	'
Net income	95,566	'	'	'	'	'	95,566
Other comprehensive income (loss)	-69,188	'	'	'	'	-69,188	'
Stock-based compensation	8,946	'	'	'	8,946	'	'
Stock-based compensation (in shares)	'	74,000	'	'	'	'	'
Issuance of restricted shares, net of shares remitted	-731	'	'	'	-731	'	'
Issuance of restricted shares, net of shares remitted (in shares)	'	-19,000	'	'	'	'	'
Issuance costs related to issuances of common stock	-250	'	'	'	-250	'	'
Exercise of stock options	400	3	'	'	397	'	'
Exercise of stock options (in shares)	'	61,000	'	'	'	'	'
Net tax benefit on exercise of stock-based awards	1,399	'	'	'	1,399	'	'
Employee stock purchase plan	7,425	'	'	'	7,425	'	'
Employee stock purchase plan (in shares)	'	171,000	'	'	'	'	'
Balance at Dec. 31, 2013	$1,475,639	$607	$0	($469)	$898,165	($19,556)	$596,892
Balance (in shares) at Dec. 31, 2013	'	60,672,000	'	'	'	'	'

OPERATIONS

OPERATIONS	12 Months Ended
OPERATIONS	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Operations	'
	OPERATIONS
	Clean Harbors, Inc., through its subsidiaries (collectively, the "Company"), is a leading provider of environmental, energy and industrial services throughout North America. On December 28, 2012, the Company acquired 100% of the outstanding common shares of Safety-Kleen, Inc. and its subsidiaries (collectively, "Safety-Kleen"), which is the largest re-refiner and recycler of used oil in the world and the largest provider of parts cleaning and environmental services to commercial, industrial and automotive customers in North America.

SIGNIFICANT_ACCOUNTING_POLICIE

SIGNIFICANT ACCOUNTING POLICIES

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

SIGNIFICANT ACCOUNTING POLICIES

The accompanying consolidated financial statements of the Company reflect the application of certain significant accounting policies as described below:

Principles of Consolidation

The accompanying consolidated statements include the accounts of Clean Harbors, Inc. and its majority-owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.

Use of Estimates

The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions, which are evaluated on an ongoing basis, that affect the amounts reported in the Company's consolidated financial statements and accompanying notes. Management bases its estimates on historical experience and on various other assumptions it believes to be reasonable at the time under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities and disclosure, if any, of contingent assets and liabilities and reported amounts of revenues and expenses. Actual results could differ from those estimates and judgments.

Reclassifications

Following the acquisition of Safety-Kleen on December 28, 2012, the Company made changes in the first quarter of 2013 to the manner in which it manages its business, make operating decisions and assess performance. The amounts presented for all periods herein have been recast to reflect the impact of such changes. In addition, the December 31, 2012 balance sheet has been adjusted for purchase price measurement period adjustments related to the Safety-Kleen acquisition as disclosed in Note 3, "Business Combinations." Any prior period amounts that were recast as a result of purchase price measurement period adjustments related to the Safety-Kleen acquisition have been labeled "As Adjusted" herein. These reclassifications and adjustments had no effect on consolidated net income, comprehensive income, cash flows or stockholders' equity for any of the periods presented. The Company's revenues and cost of revenues in the consolidated statements of income have been reclassified to conform to the current year presentation.

Fair Value Valuation Hierarchy

The Company defines fair value as the price that would be received to sell an asset or be paid to transfer a liability in an orderly transaction between market participants at the measurement date. The Company applies the following fair value hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement. Level 1 inputs are quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level 2 utilizes quoted market prices in markets that are not active, broker or dealer quotations, or alternative pricing sources with reasonable levels of price transparency. Level 3 inputs are unobservable inputs for the asset or liability in which there is little, if any, market activity for the asset or liability at the measurement date.

Cash, Cash Equivalents and Uncashed Checks

The Company classifies all highly liquid instruments purchased with maturities of three months or less as cash equivalents.

The Company's cash management program with its revolving credit lender allows for the maintenance of a zero balance in the U.S. bank disbursement accounts that are used to issue vendor and payroll checks. The program can result in checks outstanding in excess of bank balances in the disbursement accounts. When checks are presented to the bank for payment, cash deposits in amounts sufficient to fund the checks are made, at the Company's discretion, either from funds provided by other accounts or under the terms of the Company's revolving credit facility. Therefore, until checks are presented for payment, there is no right of offset by the bank and the Company continues to have control over cash relating to both released as well as unreleased checks. Checks that have been written to vendors or employees but have not yet been presented for payment at the Company's bank are classified as uncashed checks as part of accounts payable and added back to cash balances.

Marketable Securities

The Company has classified its marketable securities as available-for-sale and, accordingly, carries such securities at fair value. Unrealized gains and losses are reported, net of tax, as a component of other comprehensive income. At December 31, 2013 and 2012, marketable securities were $12.4 million and $11.8 million, respectively. Marketable securities are classified as Level 1 in the fair value hierarchy.

Allowances for Doubtful Accounts

On a regular basis, the Company evaluates its accounts receivable and establishes the allowance for doubtful accounts based on an evaluation of historical collection trends, customer concentration, customer credit ratings, current economic trends and changes in customer payment patterns. Past-due receivable balances are written-off when the Company's internal collection efforts have been deemed unsuccessful in collecting the outstanding balance due.

Credit Concentration

Concentration of credit risks in accounts receivable is limited due to the large number of customers comprising the Company's customer base throughout North America. The Company maintains strict policies over credit extension that include credit evaluations, credit limits and collection monitoring procedures on a customer-by-customer basis. However, the Company generally does not require collateral before services are performed. As of December 31, 2013 and 2012, no individual customer accounted for more than 10% of net accounts receivable. During each of the years ended December 31, 2013, 2012 and 2011, no individual customer accounted for more than 10% of total revenues.

Unbilled Receivables

The Company recognizes unbilled accounts receivable for service and disposal transactions rendered but not invoiced to the customer by the end of the period.

Deferred Costs Relating to Deferred Revenue

Commissions and other incremental direct costs, primarily costs of materials and transportation expenses, relating to deferred revenue from the Company’s parts cleaning services, containerized waste services and vacuum services are capitalized and deferred. The deferred costs are included in current assets in the consolidated balance sheet and expensed when the related revenues are recognized.

Inventories and Supplies

Inventories are stated at the lower of cost or market. The cost of oil and oil products is principally determined on a first-in, first-out ("FIFO") basis. The cost of supplies and drums, solvent and solution and other inventories is determined on a FIFO basis or a weighted-average cost basis. Costs for oil and oil products, solvent and repair parts include purchase costs, fleet and fuel costs, direct labor, transportation costs and production related costs. The Company quarterly reviews its inventories for obsolete or unsalable items and adjusts its carrying value to reflect estimated realizable values.

Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist primarily of prepayments for various services, refundable deposits, and income taxes receivable.

Property, Plant and Equipment (excluding landfill assets)

Property, plant and equipment are stated at cost and include amounts capitalized under capital lease obligations. Expenditures for major renewals and improvements which extend the life or usefulness of the asset are capitalized. Items of an ordinary repair or maintenance nature are charged directly to operating expense as incurred. During the construction and development period of an asset, the costs incurred, including applicable interest costs, are classified as construction-in-progress.

The Company depreciates and amortizes the cost of these assets, using the straight-line method as follows:

Asset Classification

Estimated Useful Life

Buildings and building improvements

Buildings

30–40 years

Leasehold and building improvements

2–40 years

Camp equipment

12–15 years

Vehicles

3–12 years

Equipment

Capitalized software and computer equipment

3–5 years

Solar equipment

20 years

Containers and railcars

15–20 years

All other equipment

8–20 years

Furniture and fixtures

5–8 years

Leasehold and building improvements have a weighted average life of 8.8 years.

Camp equipment consists of industrial lodging facilities that are utilized to provide lodging services to downstream oil and gas companies in Western Canada.

Solar equipment consists of a solar array that is used to provide electric power for a continuously operating groundwater decontamination pump and treatment system at a closed and capped landfill located in New Jersey.

The Company recognizes an impairment in the carrying value of long-lived assets when the expected future undiscounted cash flows derived from the assets, or group of assets, are less than their carrying value. For the years ended December 31, 2013, 2012 and 2011, the Company did not record impairment charges related to long-lived assets. The Company will continue to assess all of its long-lived assets for impairment as necessary.

Goodwill and Intangible Assets

Goodwill is comprised of the purchase price of business acquisitions in excess of the fair value assigned at acquisition to the net tangible and identifiable intangible assets acquired. Goodwill is not amortized but is reviewed for impairment annually as of December 31, or when events or changes in the business environment indicate that the carrying value of the reporting unit may exceed its fair value, by comparing the fair value of each reporting unit to its carrying value, including goodwill. 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.

The Company conducted its annual impairment test of goodwill for all of its seven reporting units as of December 31, 2013 and determined that no adjustment to the carrying value of goodwill for any reporting unit was necessary because the fair values of the reporting units exceeded their respective carrying values. As of December 31, 2013, the fair value of all reporting units, except for the Oil Re-refining and Recycling reporting unit, was determined using solely an income approach (a discounted cash flow analysis) as the fair value for the reporting units significantly exceeded the respective carrying value. The Company corroborated the approach by considering other factors such as the fair value of comparable companies to the its reporting units. The Company also performed a reconciliation of the fair value of all reporting units to the Company's overall market capitalization.

The fair value of the Oil Re-refining and Recycling reporting unit in 2013 was determined using the income approach and the market approach (a comparison to guideline companies). The fair value of the reporting unit exceeded the carrying value by less than 10% at December 31, 2013. This reporting unit had lower than anticipated results that were primarily due to lower oil sales prices and a sales mix more weighted to base oil than blended oil. The lower sales prices reflected general economic conditions in the oil industry in 2013. The financial performance of this reporting unit, which had a goodwill balance of approximately $171.2 million at December 31, 2013, is affected by fluctuations in oil prices and sales mix. The Company will continue to closely monitor the performance of all of its reporting units.

During the second quarter of 2013, due to lower than anticipated results in the Oil and Gas Field Services reporting unit, the Company performed an interim sensitivity analysis of the impact of the lower than anticipated results on the reporting unit's fair value in the second quarter, and concluded the fair value of the reporting unit more likely than not exceeded its carrying value at June 30, 2013. The fair value of the Oil and Gas Field Services reporting unit exceeded its carrying value by more than 10% at December 31, 2013. The financial performance of this reporting unit, which had a goodwill balance of approximately $37.5 million at December 31, 2013, is affected by weather conditions and fluctuations in oil and gas prices.

As of December 31, 2012, the Company utilized the income approach (a discounted cash flow analysis) to determine the fair value of the Technical Services, Field Services, Industrial Services and Lodging Services reporting units as the fair value for these reporting units in 2012 significantly exceeded their respective carrying values. The Company corroborated the approach by considering other factors such as the fair value of comparable companies to the Company's reporting units, and also performed a reconciliation of the fair value of all reporting units to the Company's overall market capitalization. The fair value of the Oil and Gas Field Services reporting unit as of December 31, 2012 was determined using a weighted average of the income approach and the market approach (a comparison to guideline companies), weighted primarily on the income approach. The Company utilized a weighted-average of the income approach and the market approach as the fair value under the income approach did not significantly exceed the carrying value due to lower than anticipated financial results of the reporting unit in the third quarter of 2012. The lower than anticipated results were primarily due to the repositioning of certain assets and rental equipment in the second and third quarters of 2012 to meet changing market conditions and unfavorable rain and weather conditions in Western Canada. These changes in the business negatively affected the Company's revenues and profitability. The fair value of the reporting unit exceeded its carrying value by more than 10% at December 31, 2012.

Permits and intangible assets are recorded at cost, such as legal fees, site surveys, engineering costs and other expenditures. Other intangible assets consist primarily of customer and supplier relationships, trademarks and trade names, and non-compete agreements. Permits relating to landfills are amortized on a units-of-consumption basis. All other permits are amortized over periods ranging from 5 to 30 years on a straight-line basis. Other intangible assets are amortized on a straight-line basis over their respective useful lives, which range from 3 to 20 years. Amortization expense was $35.1 million, $17.2 million and $12.4 million for the years ended December 31, 2013, 2012 and 2011, respectively.

Finite-lived intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that their carrying value may not be entirely recoverable. When such factors and circumstances exist, management compares the projected undiscounted future cash flows associated with the related asset or group of assets over their estimated useful lives against their respective carrying amounts. The impairment loss, if any, is measured as the excess of the carrying amount over the fair value of the asset or group of assets.

Indefinite-lived intangible assets are not amortized but are reviewed for impairment annually as of December 31, or when events or changes in the business environment indicate that the carrying value may be impaired. If the fair value of the asset is less than the carrying amount, the Company performs a quantitative test to determine the fair value. The impairment loss, if any, is measured as the excess of the carrying value of the asset over its fair value. The fair value of the indefinite-lived intangible assets exceeded their carrying values at December 31, 2013.

Leases

The Company leases rolling stock, rail cars, equipment, real estate and office equipment under operating leases. Certain real estate leases contain rent holidays and rent escalation clauses. Most of the Company's real estate lease agreements include renewal periods at the Company's option. For its operating leases, the Company recognizes rent holiday periods and scheduled rent increases on a straight-line basis over the lease term beginning with the date the Company takes possession of the leased assets.

Landfill Accounting

The Company amortizes landfill improvements, and certain landfill-related permits over their estimated useful lives. The units-of-consumption method is used to amortize land, landfill cell construction, asset retirement costs and remaining landfill cells and sites. The Company also utilizes the units-of-consumption method to record closure and post-closure obligations for landfill cells and sites. Under the units-of-consumption method, the Company includes future estimated construction and asset retirement costs, as well as costs incurred to date, in the amortization base of the landfill assets. Additionally, where appropriate, as described below, the Company includes probable expansion airspace that has yet to be permitted in the calculation of the total remaining useful life of the landfill. If it is determined that expansion capacity should no longer be considered in calculating the recoverability of a landfill asset, the Company may be required to recognize an asset impairment or incur significantly higher amortization expense. If at any time the Company makes the decision to abandon the expansion effort, the capitalized costs related to the expansion effort are expensed immediately.

Landfill assets—Landfill assets include the costs of landfill site acquisition, permits and cell construction incurred to date. These amounts are recorded at cost, which includes capitalized interest as applicable. Landfill assets, net of amortization, are combined with management's estimate of the costs required to complete construction of the landfill to determine the amount to be amortized over the remaining estimated useful economic life of a site. Amortization of landfill assets is recorded on a units-of-consumption basis, such that the landfill assets should be completely amortized at the date the landfill ceases accepting waste. Amortization totaled $16.8 million, $17.3 million and $10.4 million for the years ended December 31, 2013, 2012 and 2011, respectively. Changes in estimated costs to complete construction are applied prospectively to the amortization rate.

Landfill capacity—Landfill capacity, which is the basis for the amortization of landfill assets and for the accrual of final closure and post-closure obligations, represents total permitted airspace plus unpermitted airspace that management believes is probable of ultimately being permitted based on established criteria. The Company applies the following criteria for evaluating the probability of obtaining a permit for future expansion airspace at existing sites, which provides management a basis to evaluate the likelihood of success of unpermitted expansions:

•

Personnel are actively working to obtain the permit or permit modifications (land use, state, provincial and federal) necessary for expansion of an existing landfill, and progress is being made on the project.

•

Management expects to submit the application within the next year and to receive all necessary approvals to accept waste within the next 5 years.

•

At the time the expansion is included in the Company's estimate of the landfill's useful economic life, it is probable that the required approvals will be received within the normal application and processing time periods for approvals in the jurisdiction in which the landfill is located.

•

The Company or other owner of the landfill has a legal right to use or obtain the right to use the land associated with the expansion plan.

•

There are no significant known political, technical, legal or business restrictions or issues that could impair the success of such expansion.

•

A financial feasibility analysis has been completed and the results demonstrate that the expansion will have a positive financial and operational impact such that management is committed to pursuing the expansion.

•

Additional airspace and related additional costs, including permitting, final closure and post-closure costs, have been estimated based on the conceptual design of the proposed expansion.

Exceptions to the criteria set forth above may be approved through a landfill-specific approval process that includes approval from the Company's Chief Financial Officer and review by the Audit Committee of the Company's Board of Directors.

As of December 31, 2013, there were two unpermitted expansions at two locations included in the Company's landfill accounting model, which represented 19.1% of the Company's remaining airspace at that date. As of December 31, 2013 and 2012, the unpermitted expansions met the Company's established criteria and were not considered exceptions. If actual expansion airspace is significantly different from the Company's estimate of expansion airspace, the amortization rates used for the units-of-consumption method would change, therefore impacting the Company's profitability. If the Company determines that there is less actual expansion airspace at a landfill, this would increase amortization expense recorded and decrease profitability, while if the Company determines a landfill has more actual expansion airspace, amortization expense would decrease and profitability would increase.

As of December 31, 2013, the Company had 11 active landfill sites (including the Company's two non-commercial landfills), which have estimated remaining lives (based on anticipated waste volumes and remaining highly probable airspace) as follows:

Remaining

Remaining Highly Probable Airspace

Lives

(cubic yards) (in thousands)

Facility Name

Location

(Years)

Permitted

Unpermitted

Total

Altair

Texas

752

—

752

Buttonwillow

California

7,701

—

7,701

Deer Park

Texas

342

—

342

Deer Trail

Colorado

2,061

—

2,061

Grassy Mountain

Utah

2,058

—

2,058

Kimball

Nebraska

281

—

281

Lambton

Ontario

120

4,708

4,828

Lone Mountain

Oklahoma

2,769

—

2,769

Ryley

Alberta

912

880

1,792

Sawyer

North Dakota

4,007

—

4,007

Westmorland

California

2,732

—

2,732

23,735

5,588

29,323

At December 31, 2013 and 2012, the Company had no cubic yards of permitted, but not highly probable, airspace.

The following table presents the remaining highly probable airspace from January 1, 2011 through December 31, 2013 (in thousands of cubic yards):

2013

2012

2011

Remaining capacity at January 1,

29,643

27,557

28,557

Addition of highly probable airspace, net

1,218

3,598

102

Consumed

(1,538

)

(1,512

)

(1,102

)

Remaining capacity at December 31,

29,323

29,643

27,557

Amortization of cell construction costs and accrual of cell closure obligations—Landfills are typically comprised of a number of cells, which are constructed within a defined acreage (or footprint). The cells are typically discrete units, which require both separate construction and separate capping and closure procedures. Cell construction costs are the costs required to excavate and construct the landfill cell. These costs are typically amortized on a units-of-consumption basis, such that they are completely amortized when the specific cell ceases accepting waste. In some instances, the Company has landfills that are engineered and constructed as "progressive trenches." In progressive trench landfills, a number of contiguous cells form a progressive trench. In those instances, the Company amortizes cell construction costs over the airspace within the entire trench, such that the cell construction costs will be fully amortized at the end of the trench useful life.

The design and construction of a landfill does not create a landfill asset retirement obligation. Rather, the asset retirement obligation for cell closure (the cost associated with capping each cell) is incurred in relatively small increments as waste is placed in the landfill. Therefore, the cost required to construct the cell cap is capitalized as an asset retirement cost and a liability of an equal amount is established, based on the discounted cash flow associated with each capping event, as airspace is consumed. Spending for cell capping is reflected as environmental expenditures within operating activities in the statement of cash flows.

Landfill final closure and post-closure liabilities—The balance of landfill final closure and post-closure liabilities at December 31, 2013 and 2012 was $27.6 million and $26.7 million, respectively. The Company has material financial commitments for the costs associated with requirements of the Environmental Protection Agency ("EPA") and the comparable regulatory agency in Canada for landfill final closure and post-closure activities. In the United States, the landfill final closure and post-closure requirements are established under the standards of the EPA, and are implemented and applied on a state-by-state basis. The Company develops estimates for the cost of these activities based on an evaluation of site-specific facts and circumstances, including the Company's interpretation of current regulatory requirements and proposed regulatory changes. Such estimates may change in the future due to various circumstances including, but not limited to, permit modifications, changes in legislation or regulations, technological changes and results of environmental studies.

Final closure costs are the costs incurred after the site ceases to accept waste, but before the landfill is certified as closed by the applicable state regulatory agency. These costs generally include the costs required to cap the final cell of the landfill (if not included in cell closure), the costs required to dismantle certain structures for landfills and other landfill improvements, and regulation-mandated groundwater monitoring, and leachate management. Post-closure costs involve the maintenance and monitoring of a landfill site that has been certified closed by the applicable regulatory agency. These costs generally include groundwater monitoring and leachate management. Regulatory post-closure periods are generally 30 years after landfill closure. Final closure and post-closure obligations are accrued on a units-of-consumption basis, such that the present value of the final closure and post-closure obligations are fully accrued at the date the landfill discontinues accepting waste.

Cell closure, final closure and post closure costs (also referred to as "asset retirement obligations") are calculated by estimating the total obligation in current dollars, adjusted for inflation (1.02% during 2013 and 2012) and discounted at the Company's credit-adjusted risk-free interest rate.

Non-Landfill Closure and Post-Closure Liabilities

Non-landfill closure costs include costs required to dismantle and decontaminate certain structures and other costs incurred during the closure process. Post-closure costs, if required, include associated maintenance and monitoring costs as required by the closure permit. Post-closure periods are performance-based and are not generally specified in terms of years in the closure permit, but generally range from 10 to 30 years or more.

The Company records its non-landfill closure and post-closure liability by: (i) estimating the current cost of closing a non-landfill facility and the post-closure care of that facility, if required, based upon the closure plan that the Company is required to follow under its operating permit, or in the event the facility operates with a permit that does not contain a closure plan, based upon legally enforceable closure commitments made by the Company to various governmental agencies; (ii) using probability scenarios as to when in the future operations may cease; (iii) inflating the current cost of closing the non-landfill facility on a probability weighted basis using the inflation rate to the time of closing under each probability scenario; and (iv) discounting the future value of each closing scenario back to the present using the credit-adjusted risk-free interest rate. Non-landfill closure and post-closure obligations arise when the Company commences operations.

The balance of non-landfill closure and post-closure liabilities at December 31, 2013 and 2012 was $19.5 and $17.4 million, respectively. Management bases estimates for non-landfill closure and post-closure liabilities on its interpretation of existing permit and regulatory requirements for closure and post-closure maintenance and monitoring. The Company's cost estimates are calculated using internal sources as well as input from third party experts. Management uses probability scenarios to estimate when future operations will cease and inflates the current cost of closing the non-landfill facility on a probability weighted basis using the appropriate inflation rate and then discounting the future value to arrive at an estimated present value of closure and post-closure costs. The estimates for non-landfill closure and post-closure liabilities are inherently uncertain due to the possibility that permit and regulatory requirements will change in the future, impacting the estimation of total costs and the timing of the expenditures. Management reviews non-landfill closure and post-closure liabilities for changes to key assumptions that would impact the amount of the recorded liabilities. Changes that would prompt management to revise a liability estimate include changes in legal requirements that impact the Company's expected closure plan or scope of work, in the market price of a significant cost item, in the probability scenarios as to when future operations at a location might cease, or in the expected timing of the cost expenditures. Changes in estimates for non-landfill closure and post-closure events immediately impact the required liability and the value of the corresponding asset. If a change is made to a fully-consumed asset, the adjustment is charged immediately to expense. When a change in estimate relates to an asset that has not been fully consumed, the adjustment to the asset is recognized in income prospectively as a component of amortization. Historically, material changes to non-landfill closure and post-closure estimates have been infrequent.

Remedial Liabilities

The balance of remedial liabilities at December 31, 2013 and 2012 was $172.5 million and $183.3 million, respectively. Remedial liabilities, including Superfund liabilities, include the costs of removal or containment of contaminated material, treatment of potentially contaminated groundwater and maintenance and monitoring costs necessary to comply with regulatory requirements. Most of the Company's remedial liabilities relate to the active and inactive hazardous waste treatment and disposal facilities which the Company acquired in the last 12 years and 35 Superfund sites owned by third parties for which the Company agreed to indemnify certain remedial liabilities owed or potentially owed to governmental entities by the sellers of certain assets (the "CSD assets") which the Company acquired in 2002. The Company performed extensive due diligence to estimate accurately the aggregate liability for remedial liabilities to which the Company became potentially liable as a result of the acquisitions. The Company's estimate of remedial liabilities involved an analysis of such factors as: (i) the nature and extent of environmental contamination (if any); (ii) the terms of applicable permits and agreements with regulatory authorities as to cleanup procedures and whether modifications to such permits and agreements will likely need to be negotiated; (iii) the cost of performing anticipated cleanup activities based upon current technology; and (iv) in the case of Superfund and other sites where other parties will also be responsible for a portion of the cleanup costs, the likely allocation of such costs and the ability of such other parties to pay their share. Remedial liabilities and on-going operations are reviewed quarterly and adjustments are made as necessary.

The Company periodically evaluates potential remedial liabilities at sites that it owns or operates or to which the Company or the sellers of the CSD assets (or the respective predecessors of the Company or such sellers) transported or disposed of waste, including 123 Superfund sites as of December 31, 2013. The Company periodically reviews and evaluates sites requiring remediation, including Superfund sites, giving consideration to the nature (i.e., owner, operator, arranger, transporter or generator) and the extent (i.e., amount and nature of waste hauled to the location, number of years of site operations or other relevant factors) of the Company's (or such sellers') alleged connection with the site, the extent (if any) to which the Company believes it may have an obligation to indemnify cleanup costs in connection with the site, the regulatory context surrounding the site, the accuracy and strength of evidence connecting the Company (or such sellers) to the location, the number, connection and financial ability of other named and unnamed potentially responsible parties ("PRPs") and the nature and estimated cost of the likely remedy. Where the Company concludes that it is probable that a liability has been incurred and an amount can be estimated, a provision is made, based upon management's judgment and prior experience, of such estimated liability.

Remedial liabilities are inherently difficult to estimate. Estimating remedial liabilities requires that the existing environmental contamination be understood. There are risks that the actual quantities of contaminants differ from the results of the site investigation, and that contaminants exist that have not been identified by the site investigation. In addition, the amount of remedial liabilities recorded is dependent on the remedial method selected. There is a risk that funds will be expended on a remedial solution that is not successful, which could result in the additional incremental costs of an alternative solution. Such estimates, which are subject to change, are subsequently revised if and when additional or new information becomes available.

Remedial liabilities are discounted only when the timing of the payments is estimable and the amounts are determinable. Management's experience has been that the timing of payments for remedial liabilities is not usually estimable, and therefore the amounts of remedial liabilities are not generally discounted. In the case of remedial liabilities assumed in connection with acquisitions, acquired liabilities are recorded under purchase accounting at fair value. Accordingly, as of the respective acquisition dates, the Company recorded the remedial liabilities assumed as part of acquisitions at their fair value, which were calculated by inflating costs in current dollars using an estimate of future inflation rates as of the respective acquisition dates until the expected time of payment, and then discounting the amount of the payments to their present value using a risk-free discount rate as of the acquisition dates. Discounts were and will be applied to the environmental liabilities as follows:

•

Remedial liabilities assumed relating to acquisitions are and will continue to be inflated using the inflation rates at the time of each acquisition (ranging from 1.01% to 2.44%) until the expected time of payment, then discounted at the risk-free interest rate at the time of such acquisition (ranging from 2.88% to 4.9%).

•

Remedial liabilities incurred subsequent to the acquisitions and remedial liabilities of the Company that existed prior to the acquisitions have been and will continue to be recorded at the estimated current value of the liabilities, which is usually neither increased for inflation nor reduced for discounting.

Derivative Financial Instruments

The Company uses commodity derivatives to manage against significant fluctuations in oil and oil derivative commodity prices and indices, specifically the ICIS-LOR rate and 6-oil index. All commodity derivatives are comprised of cashless collar contracts related to crude oil prices, pursuant to which the Company sells a call to a bank and then purchases a put from the same bank. The derivative instruments are not designated as hedges and expire in 2014 and 2015. Total derivative instrument asset and total derivative instrument liability are included in the consolidated balance sheets as a component of prepaid expenses and other current assets and accrued expenses, respectively. As of December 31, 2013 and 2012, the fair value of these instruments in the Company’s consolidated balance sheets was immaterial.

Letters of Credit

The Company utilizes letters of credit primarily as security for financial assurance which it has been required to provide to regulatory bodies for its hazardous waste facilities and which would be called only in the event that the Company fails to satisfy closure, post-closure and other obligations under the permits issued by those regulatory bodies for such licensed facilities. See Note 10, "Financing Arrangements," for further discussion of financing arrangements. As of December 31, 2013 and 2012, the Company had outstanding letters of credit in an aggregate amount of $140.3 million and $132.6 million, respectively, under the Company's revolving credit facility.

Foreign Currency

During the year ended December 31, 2013 and 2012, the Company had operations in Canada, and to a much lesser extent, Mexico and Trinidad. Assets and liabilities are translated to U.S. dollars at the exchange rate in effect at the balance sheet date and revenue and expenses at the average exchange rate for the period. Gains and losses from the translation of the consolidated financial statements of certain foreign subsidiaries into U.S. dollars are included in stockholders' equity as a component of accumulated other comprehensive income. Gains and losses resulting from foreign currency transactions are recognized in the consolidated statements of income. Recorded balances that are denominated in a currency other than the functional currency are remeasured to the functional currency using the exchange rate at the balance sheet date and gains or losses are recorded in the statements of income.

Revenue Recognition and Deferred Revenue

During 2013, the Company provided environmental, energy and industrial services through five segments: Technical Services, Oil Re-refining and Recycling, SK Environmental Services, Industrial and Field Services, and Oil and Gas Field Services. The Company recognizes revenue when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the price is fixed or determinable, and collection is reasonably assured. Revenue is recognized net of estimated allowances. Revenue is generated by short-term projects, most of which are governed by master service agreements that are long-term in nature. The master service agreements are typically entered into with the Company's larger customers and outline the pricing and legal frameworks for such arrangements.

Due to the nature of the business and the complex invoices that result from the services provided, customers may withhold payments and attempt to renegotiate amounts invoiced. Accordingly, management establishes a revenue allowance to cover the estimated amounts of revenue that may need to be credited to customers' accounts in future periods. The Company records a provision for revenue allowances based on specific review of particular customers, historical trends and other relevant information.

Technical Services revenue is generated from fees charged for hazardous material management and disposal services including onsite environmental management services, collection and transportation, packaging, recycling, treatment and disposal of hazardous and non-hazardous waste. Services are provided based on purchase orders or agreements with the customer and include prices based upon units of volume of waste, and transportation and other fees. Collection and transportation, and packaging revenues are recognized when the transported waste is received at the disposal facility. Revenues for treatment and disposal of hazardous waste are recognized upon completion of wastewater treatment, final disposition in a landfill or incineration of the waste, all at Company-owned sites, or when the waste is shipped to a third party for processing and disposal. Revenues from recycled oil and recycled catalyst are recognized upon shipment to the customer. Revenue for all other Technical Services is recognized when services are rendered. The Company, at the request of a customer, periodically enters into bundled arrangements for the collection and transportation and disposal of waste. The Company accounts for such arrangements as multiple-element arrangements with separate units of accounting. The Company measures and allocates the consideration from the arrangement to the separate units, based on evidence of the estimated selling price for each deliverable. Revenues from waste that is not yet completely processed and disposed and the related costs are deferred. The revenue is recognized and the deferred costs are expensed when the related services are completed.

Oil Re-refining and Recycling revenue is generated from re-refining used oil to produce high quality base and blended lubricating oils, and recycling used oil collected in excess of the Company's re-refining capacity into recycled fuel oil. The high quality base and blended lubricating oils are sold to third-party distributors, retailers, government agencies, fleets, railroads and industrial customers. The recycled fuel oil is sold to asphalt plants, industrial plants, blenders, pulp and paper companies, vacuum gas oil producers and marine diesel oil producers. Revenue is recognized upon delivery.

S-K Environmental Services revenue is generated from providing parts cleaning services, containerized waste services, oil collection services and other complementary products and services. Parts cleaning services generally consist of placing a specially designed parts washer at a customer's premises and then, on a recurring basis, delivering clean solvent or aqueous-based washing fluid, cleaning and servicing the parts washer and removing the used solvent or aqueous fluid. The Company also services customer-owned parts washers. Revenue from parts cleaning services is recognized over the service interval. Service intervals represent the actual amount of time between service visits to a particular parts cleaning customer. Average service intervals vary from seven to 14 weeks depending on several factors, such as customer accommodation, types of machines serviced and frequency of use. Containerized waste services consist of profiling, collecting, transporting and recycling or disposing of a wide variety of hazardous and non-hazardous wastes. Collection and transportation, and packaging revenues are recognized when the transported waste is received at the disposal facility. Revenues for treatment and disposal of the waste is recognized upon disposal, or when the waste is shipped to a third party for processing and disposal. Other complementary products and services include vacuum services, allied products and other environmental services. Revenue is recognized when products are delivered and services are performed.

Industrial and Field Services consists primarly of industrial services, field services and lodging services. Industrial Services provides industrial and specialty services, such as high-pressure and chemical cleaning, catalyst handling, decoking, pigging and industrial lodging services to refineries, chemical plants, oil sands facilities, pulp and paper mills, and other industrial facilities. These services are provided based on purchase orders or agreements with the customer and include prices based upon daily, hourly or job rates for equipment, materials and personnel. Revenues are recognized over the term of the agreements or as services are performed. Field Services provides cleanup services on customer sites or other locations on a scheduled or emergency response basis, as well as oil and oil products recycling. The Company's services are provided based on purchase orders or agreements with the customer and include prices based upon daily, hourly or job rates for equipment, materials and personnel. Revenues are recorded as services are performed. Revenue is recognized on contracts with retainage when services have been rendered and collectability is reasonably assured. Revenue for lodging services is recognized in the period each room is used by the customer based on the related lodging agreements. Revenue from the sale of camp accommodations is recognized when products are delivered and services are performed.

Oil and Gas Field Services provides fluid handling, fluid hauling, production servicing, surface rentals, seismic services, and directional boring services to the energy sector serving oil and gas exploration and production and power generation. These services are provided based on purchase orders or agreements with the customer and include prices based upon daily, hourly or job rates for equipment, materials and personnel. Revenues for such services are recognized over the term of the agreements or as services are performed. Oil and Gas Field Services also provides equipment rentals to support drill sites. Revenue from rentals is recognized ratably over the rental period.

Advertising Expense

Advertising costs are expensed as incurred. Advertising expense was approximately $10.8 million in 2013, $5.0 million in 2012 and $3.9 million in 2011.

Stock-Based Compensation

Stock-based compensation cost is measured at the grant date based on the fair value of the award and is recognized as expense over the requisite service period, which generally represents the vesting period, and includes an estimate of awards that will be forfeited. The fair value of the Company's grants of restricted stock are based on the quoted market price for the Company's common stock on the respective dates of grant. The fair value of stock options is calculated using the Black-Scholes option-pricing model. Compensation expense is based on the number of options expected to vest. Forfeitures estimated when recognizing compensation expense are adjusted when actual forfeitures differ from the estimate.

Any reduction in taxes payable resulting from tax deductions that exceed the recognized tax benefit associated with compensation expense (excess tax benefits) are credited to additional paid-in capital and windfalls are classified as financing cash flows.

Income Taxes

There are two major components of income tax expense, current and deferred. Current income tax expense approximates cash to be paid or refunded for taxes for the applicable period. Deferred tax expense or benefit is the result of changes between deferred tax assets and liabilities. Deferred tax assets and liabilities are determined based upon the temporary differences between the financial statement basis and tax basis of assets and liabilities as well as from net operating loss and tax credit carryforwards as measured by the enacted tax rates, which will be in effect when these differences reverse. The Company evaluates the recoverability of future tax deductions and credits and a valuation allowance is established by tax jurisdiction when, based on an evaluation of objective verifiable evidence, it is more likely than not that some portion or all of deferred tax assets will not be realized.

The Company recognizes and measures a tax benefit from uncertain tax positions when it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The Company recognizes a liability for unrecognized tax benefits resulting from uncertain tax positions taken or expected to be taken in a tax return. The Company adjusts these liabilities when its judgment changes as a result of the evaluation of new information not previously available. Due to the complexity of some of these uncertainties, the ultimate resolution may result in a payment that is materially different from the current estimate. These differences will be reflected as increases or decreases to income tax expense in the period in which they are determined.

The Company recognizes interest and penalties related to unrecognized tax benefits within the income tax expense line in the consolidated statements of income. Accrued interest and penalties are included within unrecognized tax benefits and other long-term liabilities line in the consolidated balance sheet.

Earnings per Share ("EPS")

Basic EPS is calculated by dividing income available to common stockholders by the weighted average number of common shares outstanding during the period. Diluted EPS gives effect to all potentially dilutive common shares that were outstanding during the period.

Business Combinations

For all business combinations, the Company records 100% of all assets and liabilities of the acquired business, including goodwill, at their fair values. Acquisition-related costs are expensed in the period in which the costs are incurred and the services are received.

Recent Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board and are adopted by the Company as of the specified effective dates. Unless otherwise discussed below, management believes that the impact of recently issued accounting pronouncements will not have a material impact on the Company's financial position, results of operations and cash flows, or do not apply to the Company's operations.

In July 2013, the Financial Accounting Standards Board (“FASB”) issued ASU 2013-11 Income Taxes (Topic 740) - Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. This standard provides guidance regarding when an unrecognized tax benefit should be classified as a reduction to a deferred tax asset or when it should be classified as a liability in the consolidated balance sheet. The guidance is effective for the Company on January 1, 2014. The Company is still evaluating the impact that ASU No. 2013-11 will have on the presentation of the Company's unrecognized tax benefits. The adoption of ASU No. 2013-11 will not impact the Company's financial condition or results of operations.

In February 2013, the FASB issued ASU 2013-02 Comprehensive Income (Topic 220) - Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. The new guidance requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income (“AOCI”) by component. Entities are required to present, either on the face of the income statement where net income is presented or in the notes, significant amounts reclassified out of AOCI by respective line items of net income if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required to be reclassified in their entirety to net income, entities are required to cross-reference the disclosures required under U.S. GAAP that provide additional detail about those amounts. This guidance is effective prospectively for annual and interim reporting periods beginning after December 31, 2012. The adoption of ASU No. 2013-02, on January 1, 2013, did not impact the Company’s financial condition or results of operations.

BUSINESS_COMBINATIONS

BUSINESS COMBINATIONS	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
BUSINESS COMBINATIONS	'
	BUSINESS COMBINATIONS
	2013 Acquisitions
	Evergreen
	On September 13, 2013, the Company acquired 100% of the outstanding common shares of Evergreen Oil, Inc. (“Evergreen”) for approximately $55.9 million in cash, net of cash acquired. The purchase price is subject to adjustment upon finalization of Evergreen’s net working capital balance as of the closing date. The Company incurred acquisition-related costs of approximately $0.4 million in connection with the transaction, which are included in selling, general and administrative expenses in the consolidated statements of income for the year ended December 31, 2013. As of December 31, 2013, the Company finalized the purchase accounting for the acquisition of Evergreen, except for the other assets, environmental liabilities, taxes and goodwill. The impact of the purchase price measurement period adjustments was not material to the financial statements. Management determined the purchase price allocations based on estimates of the fair values of all tangible and intangible assets acquired and liabilities assumed. The Company believes that such information provides a reasonable basis for estimating the fair values of assets acquired and liabilities assumed.
	The following table summarizes the recognized amounts of assets acquired and liabilities assumed at September 13, 2013 (in thousands):


		Preliminary Allocations				Measurement Period Adjustments				Allocations as of December 31, 2013
	Inventories and supplies	$	1,206			$	(117	)		$	1,089

	Prepaid and other current assets	873				418				1,291

	Property, plant and equipment	40,563				—				40,563

	Permits and other intangibles	16,500				600				17,100

	Deferred tax assets, less current portion	—				2,368				2,368

	Other assets	3,607				—				3,607

	Current liabilities	(6,108		)		(90		)		(6,198		)
	Closure and post-closure liabilities	(659		)		—				(659		)

	Remedial liabilities, less current portion	(2,103		)		—				(2,103		)

	Other long-term liabilities	(1,139		)		—				(1,139		)

	Total identifiable net assets	52,740				3,179				55,919

	Goodwill	3,179				(3,179		)		—

	Total	$	55,919			$	—			$	55,919

	Evergreen, headquartered in Irvine, California, specializes in the recovery and re-refining of used oil and is currently the second-largest collector of used oil in California. Evergreen owns and operates one of the only oil re-refining operations in the western United States and also offers other ancillary environmental services, including parts cleaning and containerized waste services, vacuum services and hazardous waste management services. The acquisition of Evergreen enables the Company to further penetrate the small quantity waste generator market and further expand its oil re-refining, oil recycling and waste treatment capabilities.
	2012 Acquisitions
	Safety-Kleen
	On December 28, 2012, the Company acquired 100% of the outstanding common shares of Safety-Kleen for approximately $1.26 billion in cash. The Company financed the purchase through a combination of approximately $305.0 million of existing cash, $369.3 million in net proceeds from the Company's public offering of 6.9 million shares of Clean Harbors common stock, and approximately $589.0 million in net proceeds from the Company's private debt offering of $600.0 million of 5.125% senior unsecured notes due 2021. During the years ended December 31, 2013 and 2012, the Company incurred acquisition-related costs of approximately $2.7 million and $6.3 million, respectively, in connection with the transaction which are included in selling, general and administrative expenses in the consolidated statements of income. Safety-Kleen, headquartered in Richardson, Texas, is the largest re-refiner and recycler of used oil in the world and the largest provider of parts cleaning and environmental services to commercial, industrial and automotive customers in North America. The acquisition of Safety-Kleen enables the Company to (i) penetrate the small quantity waste generator market, (ii) broaden its waste treatment capabilities to include re-refining waste oil and expanded recycling capabilities, (iii) drive a substantial increase in waste volumes into its existing waste disposal treatment network, (iv) capitalize on the growing demand for recycled products including re-refined oil, (v) enhance its commitment to sustainability, (vi) leverage the combined sales forces to maximize cross-selling opportunities, (vii) leverage operating efficiencies through the combined company and (viii) add to its cash flow.
	As of December 31, 2013, the Company finalized the purchase accounting for the acquisition of Safety-Kleen. The purchase accounting measurement period adjustments have been applied retrospectively to the December 31, 2012 balance sheet. Management determined the purchase price allocations based on estimates of the fair values of all tangible and intangible assets acquired and liabilities assumed. The Company believes that such information provides a reasonable basis for estimating the fair values of assets acquired and liabilities assumed. The following table summarizes the recognized amounts of assets acquired and liabilities assumed at December 28, 2012 (in thousands):


		Preliminary Allocations				Measurement Period Adjustments				Final Allocations
	Inventories and supplies	$	102,339			$	5,037			$	107,376

	Other current assets (i)	152,245				3,429				155,674

	Property, plant and equipment	514,712				1,290				516,002

	Permits and other intangibles	421,400				17,227				438,627

	Other assets	4,985				(647		)		4,338

	Current liabilities	(192,652		)		(13,589		)		(206,241		)
	Closure and post-closure liabilities, less current portion	(15,774		)		8,221				(7,553		)

	Remedial liabilities, less current portion	(38,370		)		(9,931		)		(48,301		)
	Deferred taxes, unrecognized tax benefits and other long-term liabilities	(128,375		)		9,044				(119,331		)

	Total identifiable net assets	820,510				20,081				840,591

	Goodwill (ii)	436,749				(14,056		)		422,693

	Total (iii)	$	1,257,259			$	6,025			$	1,263,284

_______________________

(i)	The fair value of the assets acquired includes customer receivables with an aggregate fair value of $137.6 million. Combined gross amounts due were $142.7 million.

(ii)	Goodwill represents the excess of the fair value of the net assets acquired over the purchase price. Based on the final purchase price allocations, goodwill of $173.2 million, $174.1 million and $75.4 million has been recorded in the Oil Re-refining and Recycling, SK Environmental Services and Industrial and Field Services segments, respectively, and will not be deductible for tax purposes.

(iii)	The $6.0 million increase in the purchase price in 2013 was due to finalization of the net working capital balance (excluding cash) as of the closing date.
The Company determined that separate disclosure of Safety-Kleen’s revenues and earnings is impracticable for the year ended December 31, 2013 due to the integration of Safety-Kleen’s operations into the Company upon acquisition. No revenue, expense, income or loss of Safety-Kleen was included in the Company's consolidated statements of income for the year ended December 31, 2012 due to the immateriality of the operating results subsequent to the December 28, 2012 acquisition date.

The following unaudited pro forma combined summary financial information presented below gives effect to the following transactions as if they had occurred as of January 1, 2011, and assumes that there were no material, non-recurring pro forma adjustments directly attributable to: (i) the acquisition of Safety-Kleen, (ii) the sale of 6.9 million shares of the Company's common stock, (iii) the issuance of $600.0 million aggregate principal amount of 5.125% senior unsecured notes due 2021, and (iv) the payment of related fees and expenses (in thousands).


	2012				2011
Pro forma combined revenues	$	3,529,592			$	3,245,637

Pro forma combined net income	$	125,425			$	129,242

This pro forma financial information is not necessarily indicative of the Company's consolidated operating results that would have been reported had the transactions been completed as described herein, nor is such information necessarily indicative of the Company's consolidated results for any future period.
Other 2012 Acquisitions
In addition to Safety-Kleen, the Company made three other acquisitions in 2012. The combined purchase price for these other acquisitions was approximately $108.9 million, including the assumption and payment of debt of $7.7 million and post-closing adjustments of $2.1 million based upon finalization of the working capital balances as of the closing date. Acquisition related costs of $0.4 million were included in selling, general and administrative expenses in the Company's consolidated statements of income for the year ended December 31, 2012.
In 2013, the Company finalized the purchase accounting for the three other 2012 acquisitions. The purchase accounting measurement period adjustments recorded in 2013 were not applied retrospectively to the December 31, 2012 balance sheet due to immateriality of the related amounts. Management determined the purchase price allocations based on estimates of the fair values of all tangible and intangible assets acquired and liabilities assumed. The Company believes that such information provides a reasonable basis for estimating the fair values of assets acquired and liabilities assumed. The following table summarizes the recognized amounts of assets acquired and liabilities assumed.


(in thousands)	Preliminary Allocations				Measurement Period Adjustments				Final Allocations
Current assets (i)	$	20,270			$	117			$	20,387

Property, plant and equipment	51,901				(8		)		51,893

Customer relationships and other intangibles	21,770				(1		)		21,769

Other assets	53				4				57

Current liabilities	(5,277		)		(22		)		(5,299		)
Other liabilities	(5,133		)		(79		)		(5,212		)
Total identifiable net assets	83,584				11				83,595

Goodwill (ii)	23,956				1,308				25,264

Total	$	107,540			$	1,319			$	108,859

______________________

(i)	The fair value of the financial assets acquired included customer receivables with an aggregate fair value of $13.2 million. Combined gross amounts due were $13.5 million.

(ii)	Goodwill, which is attributed to expected operating and cross selling synergies, has been assigned to the Industrial and Field Services segment and will not be deductible for tax purposes.
The following unaudited pro forma combined financial data presents information as if the three other 2012 acquisitions had been acquired as of January 1, 2011 and assumes that there were no material, non-recurring pro forma adjustments directly attributable to those acquisitions. The pro forma financial information does not necessarily reflect the actual results that would have been reported had the Company and those three other acquisitions been combined during the periods presented, nor is it necessarily indicative of the future results of operations of the combined companies (in thousands).


	2012				2011
Pro forma combined revenues	$	2,268,621			$	2,112,297

Pro forma combined net income	$	130,322			$	126,768

2011 Acquisitions
Peak
In June 2011, the Company acquired 100% of the outstanding common shares of Peak Energy Services Ltd. (“Peak”) (other than the 3.15% of Peak’s outstanding common shares which the Company already owned) in exchange for approximately CDN $200.2 million, or U.S. $205.1 million based on an exchange rate of 0.976 CDN $ to one U.S. $ on June 10, 2011. The $205.1 million purchase price included $162.6 million in cash, $38.4 million of debt assumed (net of $15.7 million of cash acquired) and $4.1 million representing the fair value of the Company’s previously-owned 3.15% equity interest in Peak. The Company’s previously-owned 3.15% equity interest in Peak was remeasured to fair value at the acquisition date and the $1.9 million gain, previously unrealized and recorded in accumulated other comprehensive income, was recognized in other income. Acquisition-related costs of $0.7 million were included in selling, general and administrative expenses in the Company's consolidated statements of income for the year ended December 31, 2011.
Peak is a diversified energy services corporation operating in western Canada and the U.S. Through its various operating divisions, Peak provides drilling and production equipment and services to its customers in the conventional and unconventional oil and natural gas industries as well as the oil sands region of western Canada. Peak also provides water technology solutions to a variety of customers throughout North America. This acquisition expanded the Company's presence in the energy services marketplace, particularly in the area of oil and natural gas drilling and production support. The Peak business has been integrated within the Oil and Gas Field Services and Industrial and Field Services segments of the Company's operations and reporting structure.
In 2012, the Company finalized the purchase accounting for the acquisition of Peak. The following table summarizes the amounts of assets acquired and liabilities assumed at June 10, 2011 (in thousands).


	Final Allocations
Current assets(i)	$	45,222

Property, plant and equipment	151,574

Identifiable intangible assets	12,337

Other assets	8,009

Current liabilities	(28,785		)
Asset retirement obligations	(103		)
Other liabilities	(11,341		)
Total identifiable net assets	176,913

Goodwill(ii)	28,220

Total	$	205,133

____________

(i)	The fair value of the financial assets acquired included customer receivables with a fair value of $33.3 million. The gross amount due was $34.7 million.

(ii)	Goodwill, which is attributable to expected operating and cross-selling synergies, will not be deductible for tax purposes. Goodwill of $12.9 million and $15.3 million has been recorded in the Oil and Gas Field Services and Industrial and Field Services segments, respectively.
Other 2011 Acquisitions
In addition to Peak, the Company acquired in 2011 (i) certain assets of a Canadian public company which is engaged in the business of providing geospatial, line clearing and drilling services in Canada and the United States; (ii) all of the outstanding stock of a privately owned U.S. company which specializes in treating refinery waste streams primarily in the United States; and (iii) all of the outstanding stock of a privately owned Canadian company which manufactures modular buildings. The combined purchase price for the three acquisitions was approximately $142.1 million, including the assumption and payment of debt of $25.2 million, and post-closing adjustments of $4.5 million based upon the target amounts of working capital. Acquisition related costs of $0.8 million were included in selling, general and administrative expenses in the Company's consolidated statements of income for the year ended December 31, 2011.
In 2012, the Company finalized the purchase accounting for the three other 2011 acquisitions. The following table summarizes the recognized amounts of assets acquired and liabilities assumed (in thousands).


	Final Allocations
Current assets (i)	$	41,551

Property, plant and equipment	62,969

Customer relationships and other intangibles	23,371

Other assets	1,671

Current liabilities	(23,148		)
Asset retirement obligations	(200		)
Other liabilities	(2,419		)
Total identifiable net assets	103,795

Goodwill (ii)	38,339

Total	$	142,134

_______________________

(i)	The fair value of the financial assets acquired included customer receivables with an aggregate fair value of $21.4 million. Combined gross amounts due were $22.1 million.

(ii)	Goodwill of $13.3 million, $11.1 million and $13.9 million has been assigned to the Oil and Gas Field Services, Technical Services and the Industrial and Field Services segments, respectively, and will not be deductible for tax purposes.

INVENTORIES_AND_SUPPLIES

INVENTORIES AND SUPPLIES	12 Months Ended
	Dec. 31, 2013
Inventory Disclosure [Abstract]	'
INVENTORIES AND SUPPLIES	'
	INVENTORIES AND SUPPLIES
	Inventories and supplies consisted of the following (in thousands):


		December 31, 2013		31-Dec-12
				(As Adjusted)
	Oil and oil products	$	59,639	$	76,791

	Supplies and drums	64,471		69,521

	Solvent and solutions	10,100		9,398

	Other	17,886		20,768

	Total inventories and supplies	$	152,096	$	176,478

PROPERTY_PLANT_AND_EQUIPMENT

PROPERTY, PLANT, AND EQUIPMENT	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
PROPERTY, PLANT, AND EQUIPMENT	'
	PROPERTY, PLANT AND EQUIPMENT
	Property, plant and equipment consisted of the following (in thousands):


		December 31, 2013		31-Dec-12
				(As Adjusted)
	Land	$	99,794	$	104,379

	Asset retirement costs (non-landfill)	10,938		10,111

	Landfill assets	100,983		77,952

	Buildings and improvements	327,956		359,816

	Camp equipment	187,831		135,827

	Vehicles	425,296		385,172

	Equipment	1,201,296		1,034,856

	Furniture and fixtures	5,260		3,735

	Construction in progress	58,010		34,124

		2,417,364		2,145,972

	Less - accumulated depreciation and amortization	815,194		612,919

	Total property, plant and equipment, net	$	1,602,170	$	1,533,053

	Interest in the amount of $0.9 million, $0.2 million and $0.5 million was capitalized to fixed assets during the years ended December 31, 2013, 2012 and 2011, respectively. Depreciation and amortization expense was $212.5 million, $127.2 million and $99.9 million for the years ended December 31, 2013, 2012 and 2011, respectively.

GOODWILL_AND_OTHER_INTANGIBLE_

GOODWILL AND OTHER INTANGIBLE ASSETS	12 Months Ended
GOODWILL AND OTHER INTANGIBLE ASSETS	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
GOODWILL AND OTHER INTANGIBLE ASSETS	'
	GOODWILL AND OTHER INTANGIBLE ASSETS
	The changes to goodwill for the years ended December 31, 2013 and 2012 were as follows (in thousands):


		2013			2012
		2013			(As Adjusted)
	Balance at January 1	$	579,715		$	122,392
	Balance at January 1	$	579,715		$	122,392
	Acquired from acquisitions	—			450,525
	Acquired from acquisitions	—			450,525
	Increase from adjustments related to the acquisitions during the measurement period	1,308			5,037
		1,308			5,037
	Foreign currency translation	(10,063		)	1,761
	Foreign currency translation	(10,063		)	1,761
	Balance at December 31	$	570,960		$	579,715
	Balance at December 31	$	570,960		$	579,715

	As of December 31, 2013 and 2012, the Company's finite-lived and indefinite lived intangible assets consisted of the following (in thousands):


		December 31, 2013								31-Dec-12
		December 31, 2013								(As Adjusted)
		Cost			Accumulated		Net		Weighted	Cost		Accumulated		Net		Weighted
					Amortization				Average			Amortization				Average
									Amortization							Amortization
									Period							Period
									(in years)							(in years)
	Permits	$	157,327		$	50,858	$	106,469	19.6	$	149,361	$	46,282	$	103,079	21.8
	Permits	$	157,327		$	50,858	$	106,469	19.6	$	149,361	$	46,282	$	103,079	21.8
	Customer and supplier relationships	377,899			52,814		325,085		12.1	377,702		27,740		349,962		12.9
	Customer and supplier relationships	377,899			52,814		325,085		12.1	377,702		27,740		349,962		12.9
	Other intangible	29,299			15,518		13,781		3.3	23,604		12,121		11,483		3
	assets	29,299			15,518		13,781		3.3	23,604		12,121		11,483		3
	Total amortizable permits and other intangible assets	564,525			119,190		445,335		12.2	550,667		86,143		464,524		13.2
	Total amortizable permits and other intangible assets	564,525			119,190		445,335		12.2	550,667		86,143		464,524		13.2
	Trademarks and trade	124,638			—		124,638		Indefinite	125,520		—		125,520		Indefinite
	names	124,638			—		124,638		Indefinite	125,520		—		125,520		Indefinite
	Total permits and other intangible assets	$	689,163		$	119,190	$	569,973		$	676,187	$	86,143	$	590,044
	Total permits and other intangible assets	$	689,163		$	119,190	$	569,973		$	676,187	$	86,143	$	590,044
	As of December 31, 2013, the Company's finite-lived intangible assets related to its acquisition of Evergreen consisted of the following (in thousands):


		December 31, 2013
		Cost			Weighted Average Amortization Period (in years)
	Permits	$	10,000		25
	Permits	$	10,000		25
	Supplier relationships	6,500			7
	Supplier relationships	6,500			7
	Other intangible assets	600			12
	Other intangible assets	600			12
	Total amortizable permits and other intangible assets	$	17,100		12.4
	Total amortizable permits and other intangible assets	$	17,100		12.4
	The expected amortization of the net carrying amount of finite-lived intangible assets at December 31, 2013 (in thousands):


	Years Ending December 31,	Expected
	Years Ending December 31,	Amortization
	2014	$	35,871
	2014	$	35,871
	2015	34,922
	2015	34,922
	2016	34,146
	2016	34,146
2017	32,658
2017	32,658
2018	30,367
2018	30,367
Thereafter	277,371
Thereafter	277,371
	$	445,335
	$	445,335

ACCRUED_EXPENSES

ACCRUED EXPENSES	12 Months Ended
	Dec. 31, 2013
Payables and Accruals [Abstract]	'
ACCRUED EXPENSES	'
	ACCRUED EXPENSES
	Accrued expenses consisted of the following at December 31 (in thousands):


		December 31, 2013		31-Dec-12
				(As Adjusted)
	Insurance	$	57,993	$	48,245

	Interest	20,731		20,061

	Accrued compensation and benefits	60,902		68,311

	Income, real estate, sales and other taxes	38,938		37,570

	Other	58,265		72,167

		$	236,829	$	246,354

CLOSURE_AND_POSTCLOSURE_LIABIL

CLOSURE AND POST-CLOSURE LIABILITIES	12 Months Ended
	Dec. 31, 2013
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") from January 1, 2012 through December 31, 2013 were as follows (in thousands):


		Landfill			Non-Landfill			Total
		Retirement			Retirement
		Liability			Liability
	Balance at January 1, 2012	$	25,764		$	9,117		$	34,881

	Liabilities assumed in Safety-Kleen acquisition	—			7,553			7,553

	New asset retirement obligations	3,257			—			3,257

	Accretion	2,897			1,096			3,993

	Changes in estimates recorded to statement of income	133			1,061			1,194

	Changes in estimates recorded to balance sheet	(3,086		)	15			(3,071		)

	Expenditures	(2,382		)	(1,463		)	(3,845		)
	Currency translation and other	75			10			85

	Balance at December 31, 2012 (As Adjusted)	26,658			17,389			44,047

	Liabilities assumed in Evergreen acquisition	—			659			659

	New asset retirement obligations	4,515			—			4,515

	Accretion	3,016			1,730			4,746

	Changes in estimates recorded to statement of income	(409		)	47			(362		)

	Changes in estimates recorded to balance sheet	(1,697		)	181			(1,516		)

	Expenditures	(4,175		)	(347		)	(4,522		)
	Currency translation and other	(304		)	(178		)	(482		)
	Balance at December 31, 2013	$	27,604		$	19,481		$	47,085

	All of the landfill facilities included in the above table were active as of December 31, 2013. The changes in estimates for non-landfill retirement liabilities in 2012 were primarily related to one site where the timing of the closure was accelerated.
	On July 30, 2012, the Company issued $800.0 million senior unsecured notes and on December 7, 2012, the Company issued $600.0 million senior unsecured notes resulting in the Company recalculating its credit-adjusted risk-free rate. New asset retirement obligations were discounted at the rate of 8.56% during the period January through July 2012, 6.66% during the period August through December 7, 2012 and 6.60% thereafter.
	Anticipated payments (based on current estimated costs and anticipated timing of necessary regulatory approvals to commence work on closure and post-closure activities) for each of the next five years and thereafter are as follows (in thousands):


	Year ending December 31,
	2014	$	7,017

	2015	8,607

	2016	6,860

	2017	4,526

	2018	8,164

	Thereafter	259,837

	Undiscounted closure and post-closure liabilities	295,011

	Less: Discount at credit-adjusted risk-free rate	(160,091		)
	Less: Undiscounted estimated closure and post-closure liabilities relating to airspace not yet consumed	(87,835		)
	Present value of closure and post-closure liabilities	$	47,085

REMEDIAL_LIABILITIES

REMEDIAL LIABILITIES	12 Months Ended
	Dec. 31, 2013
Environmental Remediation Obligations [Abstract]	'
REMEDIAL LIABILITIES	'
	REMEDIAL LIABILITIES
	The changes to remedial liabilities from January 1, 2012 through December 31, 2013 were as follows (in thousands):


		Remedial				Remedial				Remedial			Total
		Liabilities for				Liabilities for				Liabilities
		Landfill Sites				Inactive Sites				(Including
										Superfund) for
										Non-Landfill
										Operations
	Balance at January 1, 2012	$	5,600			$	78,449			$	51,271		$	135,320

	Liabilities assumed in Safety-Kleen acquisition	—				10,485				48,188			58,673

	Accretion	276				3,456				2,192			5,924

	Changes in estimates recorded to statement of income	(31		)		(5,978		)		(3,643		)	(9,652		)
	Expenditures	(82		)		(4,851		)		(2,413		)	(7,346		)
	Currency translation and other	66				3				358			427

	Balance at December 31, 2012 (As Adjusted)	5,829				81,564				95,953			183,346

	Liabilities assumed in Evergreen acquisition	—				—				2,384			2,384

	Accretion	281				3,302				3,212			6,795

	Changes in estimates recorded to statement of income	(190		)		(2,813		)		(317		)	(3,320		)
	Expenditures	(93		)		(7,599		)		(7,202		)	(14,894		)
	Currency translation and other	(203		)		(192		)		(1,418		)	(1,813		)
	Balance at December 31, 2013	$	5,624			$	74,262			$	92,612		$	172,498

	In 2013, the benefit resulting from changes in remedial liability estimates was primarily due to two sites. One site received site closure approval, which resulted in re-evaluating and removing certain compensation costs, and at the other site the Company received a favorable notification from the PRPs group which indicated that the Interim Remedial Measure work has been completed and was fully funded by a trust held by the regulatory agency and from funds collected from settling PRPs.
	In 2012, the benefit resulting from the changes in estimates for inactive sites primarily related to three sites. Updates to the scope of work at two sites and favorable environmental studies at a third site led to reductions in related remedial liabilities. The benefit resulting from the changes in estimates for non-landfill sites was primarily due to the implementation of a new technology to replace the traditional pump and treat method of handling wastewater at one site.
	Anticipated payments at December 31, 2013 (based on current estimated costs and anticipated timing of necessary regulatory approvals to commence work on remedial activities) for each of the next five years and thereafter are as follows (in thousands):


	Year ending December 31,
	2014	$	24,095

	2015	19,095

	2016	14,305

	2017	10,950

	2018	13,416

	Thereafter	125,003

	Undiscounted remedial liabilities	206,864

	Less: Discount	(34,366		)
	Total remedial liabilities	$	172,498

	Based on currently available facts and legal interpretations, existing technology, and presently enacted laws and regulations, the Company estimates that its aggregate liabilities as of December 31, 2013 for future remediation relating to all of its owned or leased facilities and the Superfund sites for which the Company has current or potential future liability is approximately $172.5 million. The Company also estimates that it is reasonably possible that the amount of such total liabilities could be as much as $23.7 million more. Future changes in either available technology or applicable laws or regulations could affect such estimates of remedial liabilities. Since the Company's satisfaction of the liabilities will occur over many years, the Company cannot now reasonably predict the nature or extent of future changes in either available technology or applicable laws or regulations and the impact that those changes, if any, might have on the current estimates of remedial liabilities.
	The following tables show, respectively, (i) the amounts of such estimated liabilities associated with the types of facilities and sites involved and (ii) the amounts of such estimated liabilities associated with each facility or site which represents at least 5% of the total and with all other facilities and sites as a group.
	Estimates Based on Type of Facility or Site (in thousands):


	Type of Facility or Site	Remedial				% of Total			Reasonably Possible
		Liability							Additional Liabilities(1)
	Facilities now used in active conduct of the Company's business (67 facilities)	$	83,122			48.2	%		$	10,795

Inactive facilities not now used in active conduct of the Company's business but most of which were acquired because the assumption of remedial liabilities for such facilities was part of the purchase price for the CSD assets (40 facilities)	74,227				43			11,385

Superfund sites owned by third parties (30 sites)	15,149				8.8			1,515

Total	$	172,498			100	%		$	23,695

___________________________________

-1	Amounts represent the high end of the range of management's best estimate of the reasonably possible additional liabilities.
Estimates Based on Amount of Potential Liability (in thousands):


Location	Type of Facility or Site		Remedial				% of Total			Reasonably
			Liability							Possible
										Additional
										Liabilities(1)
Baton Rouge, LA(2)	Closed incinerator and landfill		$	29,369			17	%		$	4,443

Bridgeport, NJ	Closed incinerator		19,521				11.3			2,599

Mercier, Quebec(2)	Idled incinerator and legal proceedings		13,970				8.1			1,520

Various(2)	All other incinerators, landfills, wastewater treatment facilities and service centers (104 facilities)		94,489				54.8			13,618

Various(2)	Superfund sites (each representing less than 5% of total liabilities) owned by third parties (30 sites)		15,149				8.8			1,515

Total			$	172,498			100	%		$	23,695

_________________________________

-1	Amounts represent the high end of the range of management's best estimate of the reasonably possible additional liabilities.

-2	$34.6 million of the $172.5 million remedial liabilities and $3.5 million of the $23.7 million reasonably possible additional liabilities include estimates of remediation liabilities related to the legal and administrative proceedings discussed in Note 16, "Commitments and Contingencies," as well as other such estimated remedial liabilities.
Revisions to remediation reserve requirements may result in upward or downward adjustments to income from operations in any given period. The Company believes that its extensive experience in the environmental services business, as well as its involvement with a large number of sites, provides a reasonable basis for estimating its aggregate liability. It is possible, however, that technological, regulatory or enforcement developments, the results of environmental studies, or other factors could necessitate the recording of additional liabilities or the revision of currently recorded liabilities that could be material. The impact of such future events cannot be estimated at the current time.

FINANCING_ARRANGEMENTS

FINANCING ARRANGEMENTS	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
FINANCING ARRANGEMENTS	'
	FINANCING ARRANGEMENTS
	The following table is a summary of the Company's financing arrangements (in thousands):


		December 31, 2013			December 31, 2012
	Senior unsecured notes, at 5.25%, due August 1, 2020	$	800,000		$	800,000

	Senior unsecured notes, at 5.125%, due June 1, 2021	600,000			600,000

	Long-term obligations	$	1,400,000		$	1,400,000

	Senior Unsecured Notes, at 5.25%, due August 1, 2020. On July 30, 2012, the Company issued through a private placement $800.0 million aggregate principal amount of 5.25% senior unsecured notes due 2020 ("2020 Notes"). The Company used the net proceeds from such private placement to fund the redemption and repurchase of the $520 million aggregate principal amount of 7.625% senior secured notes due 2016 ("2016 Notes"), to finance a portion of the purchase price for its 2012 acquisitions and for general corporate purposes. On November 16, 2012, the Company completed an exchange offer for the unregistered 2020 Notes originally issued in the private placement for an equivalent amount of 2020 Notes the Company had registered under the Securities Act of 1933, as amended (the "Securities Act"), pursuant to a registration statement which became effective in October 2012. At December 31, 2013 and 2012, the fair value of the Company's 2020 Notes was $804.2 million and $816.0 million, respectively, based on quoted market prices or other available market data. The fair value of the 2020 Notes is considered a Level 2 measure according to the fair value hierarchy.
	The principal terms of the 2020 Notes are as follows:
	The 2020 Notes will mature on August 1, 2020. The notes bear interest at a rate of 5.25% per annum. Interest is payable semi-annually on February 1 and August 1 of each year, commencing on February 1, 2013. The Company may redeem some or all of the 2020 Notes at any time on or after August 1, 2016 upon proper notice, at the following redemption prices plus unpaid interest:


	Year		Percentage
	2016		102.625	%
	2017		101.313	%
	2018 and thereafter		100	%
	At any time, or from time to time, prior to August 1, 2015, the Company may also redeem up to 35% of the aggregate principal amount of all the 2020 Notes issued under the indenture at a redemption price of 105.25% of the principal amount, plus accrued and unpaid interest, using proceeds from certain equity offerings, provided that after such redemption the aggregate principal amount of outstanding 2020 Notes must equal at least 65% of the aggregate principal amount of 2020 Notes issued under the indenture. Additionally, at any time, or from time to time, prior to August 1, 2016, the Company may also redeem some or all of the 2020 Notes at a redemption price of 100% of the principal amount plus a make-whole premium and any accrued and unpaid interest.
	The 2020 Notes and the related indenture contain various customary non-financial covenants and are guaranteed by substantially all of the Company's current and future domestic restricted subsidiaries. The 2020 Notes are the Company's and the guarantors' senior unsecured obligations ranking equally with the Company's and the guarantors' existing and future senior unsecured obligations and senior to any future indebtedness that is expressly subordinated to the 2020 Notes and the guarantees. The 2020 Notes and the guarantees rank effectively junior in right of payment to the Company's and the guarantors' secured indebtedness (including loans and reimbursement obligations in respect of outstanding letters of credit) under the Company's revolving credit facility and capital lease obligations to the extent of the value of the assets securing such secured indebtedness. The 2020 Notes are not guaranteed by the Company's Canadian or other foreign subsidiaries, and the 2020 Notes are structurally subordinated to all indebtedness and other liabilities, including trade payables, of the Company's subsidiaries that are not guarantors of the 2020 Notes.
	Senior Unsecured Notes, at 5.125%, due June 1, 2021. 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"). The Company used the net proceeds from such private placement to fund a portion of the purchase price to acquire Safety-Kleen. On May 21, 2013, the Company completed an exchange offer for the unregistered 2021 Notes originally issued in the private placement for an equivalent amount of 2021 Notes the Company had registered under the Securities Act pursuant to a registration statement which became effective in April 2013. At December 31, 2013 and 2012, the fair value of the Company's 2021 Notes was $601.6 million and $623.5 million, respectively, based on quoted market prices or other available market data. The fair value of the 2021 Notes is considered a Level 2 measure according to the fair value hierarchy.
	The principal terms of the 2021 Notes are as follows:
	The 2021 Notes will mature on June 1, 2021. The notes bear interest at a rate of 5.125% per annum. Interest is payable semi-annually on June 1 and December 1 of each year, commencing on June 1, 2013. The Company may redeem some or all of the 2021 Notes at the following redemption prices (expressed as percentages of the principal amount) if redeemed.


	Year		Percentage
	2016		102.563	%
	2017		101.281	%
	2018 and thereafter		100	%
	At any time, or from time to time, prior to December 1, 2015, the Company may also redeem up to 35% of the aggregate principal amount of all of the 2021 Notes issued under the indenture at a redemption price equal to 105.125% of the principal amount, plus accrued and unpaid interest, using proceeds from certain equity offerings, provided that after such redemption the aggregate principal amount of outstanding 2021 Notes must equal at least 65% of the aggregate principal amount of 2021 Notes issued under the indenture. Additionally, at any time, or from time to time, prior to December 1, 2016, the Company may redeem some or all of the 2021 Notes at a price equal to 100% of the principal amount plus a make-whole premium and accrued and unpaid interest.
	The 2021 Notes and the related indenture contain various customary non-financial covenants and are guaranteed by substantially all the Company's current and future domestic restricted subsidiaries. The 2021 Notes are the Company's and the guarantors' senior unsecured obligations ranking equally with the Company's and the guarantors' existing and future senior unsecured obligations and senior to any future indebtedness that is expressly subordinated to the 2021 Notes and the guarantees. The 2021 Notes are effectively subordinated to all of the Company's and the Company's subsidiaries secured indebtedness under the Company's revolving credit facility and capital lease obligations to the extent of the value of the assets securing such secured indebtedness. The 2021 Notes are not guaranteed by the Company's existing and future Canadian or other foreign subsidiaries, and the 2021 Notes are structurally subordinated to all indebtedness and other liabilities, including trade payables, of the Company's subsidiaries that are not guarantors of the 2021 Notes.
	Revolving Credit Facility. On January 17, 2013, the Company entered into an amendment and restatement of the previously existing revolving credit facility with Bank of America, N.A. (“BofA”), as agent for the lenders under the facility. The principal changes to the terms of the facility were to:
	(i) increase the maximum amount of borrowings and letters of credit which the Company may obtain under the facility from $250.0 million to $400.0 million (with a $325.0 million sub-limit for letters of credit);
	(ii) provide that of such $400.0 million maximum amount, $300.0 million (with a $250.0 million sub-limit for letters of credit) will be available for Clean Harbors, Inc. ("Parent") and its domestic subsidiaries and $100.0 million (with a $75.0 million sub-limit for letters of credit) will be available for Parent's Canadian subsidiaries;
	(iii) reduce the interest rate on borrowings under the facility, in the case of LIBOR loans, from LIBOR plus an applicable margin ranging (depending primarily on the Company's fixed charge coverage ratio for the most recently completed four fiscal quarters) from 1.75% to 2.25% per annum to LIBOR plus an applicable margin ranging from 1.50% to 2.00% per annum, and, in the case of base rate loans, from BofA's base rate plus an applicable margin ranging from 0.75% to 1.25% per annum to BofA's base rate plus an applicable margin ranging from 0.50% to 1.00% per annum, and with such reduced applicable margin for LIBOR loans also to be the annual fee for outstanding letters of credit; and
	(iv) extend the term of the facility so that it will expire on January 17, 2018.
	Available credit for Parent 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.
	At December 31, 2013 and 2012, the revolving credit facility had no outstanding loan balances, $259.7 million and $117.4 million, respectively, available to borrow and $140.3 million and $132.6 million, respectively, of letters of credit outstanding.

INCOME_TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
INCOME TAXES	'
	The domestic and foreign components of income before provision for income taxes were as follows (in thousands):


		For the Year Ended December 31,
		2013				2012				2011
	Domestic	$	85,775			$	90,240			$	128,201

	Foreign	58,110				37,490				56,477

	Total	$	143,885			$	127,730			$	184,678

	The provision (benefit) for income taxes consisted of the following (in thousands):


		For the Year Ended December 31,
		2013				2012				2011
	Current:
	Federal (i)	$	5,264			$	(29,401	)		$	16,285

	State	5,006				(10,736		)		6,002

	Foreign	6,930				4,030				(2,697		)

		17,200				(36,107		)		19,590

	Deferred
	Federal	20,574				23,521				22,455

	State	2,074				2,865				2,710

	Foreign	8,471				7,777				12,671

		31,119				34,163				37,836

	Net provision (benefit) for income taxes	$	48,319			$	(1,944	)		$	57,426

	_____________________

	(i)	The 2012 benefit includes a decrease in unrecognized tax benefits of $52.4 million (net of interest and penalties of $29.3 million) resulting from expiring statute of limitation periods related to an historical Canadian debt restructuring transaction.
	The Company's effective tax rate for fiscal years 2013, 2012 and 2011 was 33.6 percent, (1.5) percent and 31.1 percent, respectively. The effective income tax rate varied from the amount computed using the statutory federal income tax rate as follows (in thousands):


		For the Year Ended December 31,
		2013				2012				2011
	Tax expense at US statutory rate	$	50,360			$	44,705			$	64,637

	State income taxes, net of federal benefit	4,052				3,526				5,788

	Foreign rate differential	(10,478		)		(8,607		)		(10,229		)
	Non-deductible transaction costs	657				2,229				416

	Uncertain tax position releases	(4,010		)		(52,424		)		(6,156		)
	Uncertain tax position interest and penalties	457				1,658				2,240

	Other	7,281				6,969				730

	Net provision (benefit) for income taxes	$	48,319			$	(1,944	)		$	57,426

	The components of the total net deferred tax assets and liabilities at December 31, 2013 and 2012 were as follows (in thousands):


		2013				2012
						(As Adjusted)
Deferred tax assets:
Workers compensation accrual	$	11,825			$	10,772

Provision for doubtful accounts	7,370				5,913

Closure, post-closure and remedial liabilities	53,302				54,941

Accrued expenses	19,671				19,198

Accrued compensation	5,681				2,506

Net operating loss carryforwards(1)	77,700				95,366

Tax credit carryforwards(2)	29,985				31,932

Uncertain tax positions accrued interest and federal benefit	1,949				2,200

Stock-based compensation	1,159				844

Other	2,170				2,570

Total deferred tax assets	210,812				226,242

Deferred tax liabilities:
Property, plant and equipment	(225,271		)		(215,581		)
Permits and other intangible assets	(159,223		)		(160,531		)
Total deferred tax liabilities	(384,494		)		(376,112		)
Total net deferred tax liability before valuation allowance	(173,682		)		(149,870		)
Less valuation allowance	(29,726		)		(26,325		)
Net deferred tax liabilities	$	(203,408	)		$	(176,195	)
___________________________________

-1	As of December 31, 2013, the net operating loss carryforwards included (i) state net operating loss carryovers of $219.0 million which will begin to expire in 2014, (ii) federal net operating loss carryforwards of $163.0 million which will begin to expire in 2025, and (iii) foreign net operating loss carryforwards of $49.0 million which will begin to expire in 2014.

-2	As of December 31, 2013, the foreign tax credit carryforwards of $30.0 million will expire between 2014 and 2023.
During 2013, the Company decreased taxes payable for adjustments related to realized and recognized tax benefits of $7.1 million related to exercises of non-qualified stock options and the vesting of restricted stock of which $1.4 million resulted in an increase to additional paid-in capital.
The Company does not accrue U.S. tax for foreign earnings that it considers to be permanently reinvested outside the United States. Consequently, the Company has not provided any U.S. tax on the unremitted earnings of its foreign subsidiaries. As of December 31, 2013, the amount of earnings for which no repatriation tax has been provided was $133.9 million. It is not practicable to estimate the amount of additional tax that might be payable on those earnings if repatriated.
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. Accordingly, as of December 31, 2013, 2012 and 2011, the Company had a valuation allowance of $29.7 million, $26.3 million and $11.5 million, respectively. The total allowance as of December 31, 2013 consisted of $13.4 million of foreign tax credits, $7.0 million of state net operating loss carryforwards, $7.5 million of foreign net operating loss carryforwards and $1.8 million for the deferred tax assets of a Canadian subsidiary. The allowance as of December 31, 2012 consisted of $17.6 million of foreign tax credits, $1.4 million of state net operating loss carryforwards and $7.3 million of foreign net operating loss carryforwards. The allowance as of December 31, 2011 consisted of $10.2 million of foreign tax credits, $1.1 million of state net operating loss carryforwards and $0.2 million of foreign net operating loss carryforwards.
Included in the balance of liabilities for uncertain tax positions at December 31, 2013 and 2012 was $1.5 million and $4.9 million, respectively, of unrecognized tax benefits (including interest and penalties) that, if recognized, would affect the annual effective income tax rate.
The Company's policy is to recognize interest and penalties related to income tax matters as a component of income tax expense. The liability for unrecognized tax benefits at December 31, 2013 included accrued interest of $0.2 million. Interest expense that is recorded as a tax expense against the liability for unrecognized tax benefits for the years ended December 31, 2013, 2012 and 2011 included interest and penalties of $0.3 million, $2.8 million and $3.4 million, respectively.
The changes to unrecognized tax benefits (excluding related penalties and interest) from January 1, 2011 through December 31, 2013, were as follows (in thousands):


	2013				2012				2011				Description
Unrecognized tax benefits as of January 1	$	3,543			$	36,217			$	39,709

Gross adjustments in tax positions	210				—				(302		)		Additional Canadian liabilities

Gross increases due to current year acquisitions	—				2,652				376				Additional U.S. and Canadian liabilities

Settlements	—				—				(75		)		Required payments

Expiration of statute of limitations	(2,843		)		(35,328		)		(3,436		)		U.S. and Canadian
Foreign currency translation	394				2				(55		)		Currency translation adjustment

Unrecognized tax benefits as of December 31	$	1,304			$	3,543			$	36,217

Total unrecognized tax benefits, other than adjustments for additional accruals for interest and penalties and foreign currency translation, decreased in 2012 by approximately $52.4 million. The $52.4 million (net of interest and penalties of $29.3 million) was recorded in earnings and therefore impacted the effective income tax rate. Approximately $52.1 million was due to expiring statute of limitation periods related to a historical Canadian debt restructuring transaction and $0.3 million was related to the conclusion of examinations with state taxing authorities and the expiration of various state statute of limitation periods.
As of December 31, 2013, the Company had recorded $1.3 million of liabilities for unrecognized tax benefits and $0.2 million related to interest. As of December 31, 2012, the Company had recorded $3.5 million of liabilities for unrecognized tax benefits and $1.4 million related to interest and penalties.
The Company files U.S. federal income tax returns as well as income tax returns in various states and foreign jurisdictions. The Company may be subject to examination by the Internal Revenue Service (the "IRS") for calendar years 2010 through 2012. Additionally, any net operating losses that were generated in prior years and utilized in these years may also be subject to examination by the IRS. The Company may also be subject to examinations by state and local revenue authorities for calendar years 2009 through 2012. The Company is currently not under examination by the IRS. The Company has ongoing U.S. state and local jurisdictional audits, as well as Canadian federal and provincial audits, all of which the Company believes will not result in material liabilities.
Due to expiring statute of limitation periods and the resolution of tax audits, the Company believes that total unrecognized tax benefits will decrease by approximately $0.1 million within the next 12 months. The $0.1 million (which includes interest and penalties) is related to various federal, state and foreign tax laws and will be recorded in earnings and therefore will impact the effective income tax rate, net of tax benefits.
In September 2013, the IRS released final Tangible Property Regulations (the “Final Regulations”). The Final Regulations provide guidance on applying Regulation Section 1.263(a) of the Internal Revenue Code to amounts paid to acquire, produce or improve tangible property, as well as rules for materials and supplies (IRC Regulation Section 1.162). These regulations contain certain changes from the temporary and proposed tangible property regulations that were issued on December 23, 2011. The Final Regulations are generally effective for taxable years beginning on or after January 1, 2014. In addition, taxpayers are permitted to early adopt the Final Regulations for taxable years beginning on or after January 1, 2012. The Company does not expect the Final Regulations to have a material effect on its results of operations or cash flows. The Company is currently evaluating the impact on its consolidated balance sheets.

EARNINGS_PER_SHARE

EARNINGS PER SHARE	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
EARNINGS PER SHARE	'
	EARNINGS PER SHARE
	The following are computations of basic and diluted earnings per share (in thousands except for per share amounts):


		Years Ended December 31,
		2013		2012		2011
	Numerator for basic and diluted earnings per share:
	Net income	$	95,566	$	129,674	$	127,252

	Denominator:
	Basic shares outstanding	60,574		53,884		52,961

	Dilutive effect of equity-based compensation awards	154		195		363

	Dilutive shares outstanding	60,728		54,079		53,324



	Basic earnings per share	$	1.58	$	2.41	$	2.4

	Diluted earnings per share	$	1.57	$	2.4	$	2.39

	For the years ended December 31, 2013 and 2012, the dilutive effect of all then outstanding options, restricted stock and performance stock awards is included in the calculations above except for 109,861 and 65,336 outstanding performance stock awards, respectively, for which the performance criteria were not attained at that time. For the year ended December 31, 2011, there were no anti-dilutive securities.

STOCKHOLDERS_EQUITY

STOCKHOLDERS' EQUITY	12 Months Ended
STOCKHOLDERS' EQUITY	Dec. 31, 2013
Equity [Abstract]	'
STOCKHOLDERS' EQUITY	'
	STOCKHOLDERS' EQUITY
	Common Stock
	On December 3, 2012, the Company issued 6.9 million shares of common stock, including 900,000 shares of common stock issued upon exercise of the underwriters' option, at a public offering price of $56.00 per share. After deducting the underwriters' discount and offering expenses, the Company received net proceeds of $369.3 million from the issuance. The net proceeds from this offering were used to pay a portion of the purchase price to acquire Safety-Kleen on December 28, 2012.

ACCUMULATED_OTHER_COMPREHENSIV

ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME	'
	ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME
	The changes in accumulated other comprehensive (loss) income by component and related tax effects for the years ended December 31, 2013, 2012 and 2011 were as follows (in thousands):


		Foreign Currency Translation Adjustments			Unrealized Gains (Losses) on Available-for-Sale Securities			Unfunded Pension Liability			Total
	Balance at January 1, 2011	$	50,966		$	459		$	(666	)	$	50,759

	Other comprehensive (loss) income before reclassifications	(18,264		)	860			(393		)	(17,797		)

	Amounts reclassified out of accumulated other comprehensive income	—			(1,872		)	—			(1,872		)

	Tax effects	—			205			58			263

	Other comprehensive loss	(18,264		)	(807		)	(335		)	(19,406		)
	Balance at December 31, 2011	$	32,702		$	(348	)	$	(1,001	)	$	31,353

	Other comprehensive income (loss) before reclassifications	17,925			1,185			(885		)	18,225

	Tax effects	—			(177		)	231			54

	Other comprehensive income (loss)	17,925			1,008			(654		)	18,279

	Balance at December 31, 2012	$	50,627		$	660		$	(1,655	)	$	49,632

	Other comprehensive (loss) income before reclassifications	(70,791		)	1,452			482			(68,857		)

	Tax effects	—			(208		)	(123		)	(331		)

	Other comprehensive (loss) income	(70,791		)	1,244			359			(69,188		)

	Balance at December 31, 2013	$	(20,164	)	$	1,904		$	(1,296	)	$	(19,556	)

	There were no reclassifications out of accumulated other comprehensive (loss) income during the years ended December 31, 2013, and 2012.The amounts reclassified out of accumulated other comprehensive (loss) income into the consolidated statement of income, with presentation location, during the year ended December 31, 2011 were as follows (in thousands):


	Comprehensive (Loss) Income Components	December 31, 2011			Location
	Unrealized holding gains on available-for-sale investments	$	1,872		Other income (expense)

STOCKBASED_COMPENSATION_AND_EM

STOCK-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS

12 Months Ended

Dec. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCK-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS

Stock-Based Compensation

In 2000, the Company adopted a stock incentive plan (the "2000 Plan"), which provided for awards in the form of incentive stock options, non-qualified stock options, restricted stock awards, performance stock awards and common stock awards. The 2000 Plan expired on April 15, 2010, but as of December 31, 2013, 36,000 options remained outstanding under this plan. These options will remain outstanding until they are either exercised or expire in accordance with their terms.

In 2010, the Company adopted an equity incentive plan (the "2010 Plan"), which provides for awards of up to 6,000,000 shares of common stock (subject to certain anti-dilution adjustments) in the form of (i) stock options, (ii) stock appreciation rights, (iii) restricted stock, (iv) restricted stock units, and (v) certain other stock-based awards. The Company ceased issuing stock options in 2008, and all awards issued to date under the 2010 Plan have been in the form of restricted stock awards and performance stock awards as described below.

As of December 31, 2013 and 2012, the Company had the following types of stock-based compensation awards outstanding under the 2000 Plan and the 2010 Plan (collectively, the "Plans"): stock options, restricted stock awards and performance stock awards. The stock options generally become exercisable up to five years from the date of grant, subject to certain employment requirements, and terminate 10 years from the date of grant. The restricted stock awards generally vest over three to five years subject to continued employment. The performance stock awards vest depending on the satisfaction of certain performance criteria and continued service conditions as described below.

Total stock-based compensation cost charged to selling, general and administrative expenses for the years ended December 31, 2013, 2012 and 2011 was $9.0 million, $7.5 million and $8.2 million, respectively. The total income tax benefit recognized in the consolidated statements of income from stock-based compensation was $3.2 million, $2.9 million and $2.4 million for the years ended December 31, 2013, 2012 and 2011, respectively. The expected forfeiture rates used to calculate compensation expense were 7% for non-executive employees and 4% for executives and directors.

Stock Option Awards

The Company uses the Black-Scholes option pricing model to value the compensation expense associated with its stock option awards based on the assumptions in the following table. In addition, the Company estimates forfeitures when recognizing compensation expense, and adjusts its estimate of forfeitures over the requisite service period based on the extent to which actual forfeitures differ, or are expected to differ, from such estimates. Changes in estimated forfeitures are recognized through a cumulative catch-up adjustment in the period of change and also impact the amount of compensation expense to be recognized in future periods.

The Company ceased issuing stock option awards in May 2008 and as of December 31, 2013, all remaining options then outstanding had vested.

The following table summarizes activity under the Plans relating to stock options:

Stock Options

Number of

Weighted Average

Aggregate

Exercise Price

Remaining

Intrinsic Value

Contractual Term

as of 12/31/13

(in years)

(in thousands)

Outstanding at January 1, 2013

97,200

15.1

1.96

3,880

Exercised

(61,200

)

6.49

Outstanding, exercisable and vested at December 31, 2013

36,000

29.73

4.04

1,088

As of December 31, 2013, there was no unrecognized compensation cost related to stock option awards under the Company's Plans. The total intrinsic value of options exercised during 2013, 2012 and 2011 was $2.5 million, $2.3 million, and $2.1 million, 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 year ended December 31, 2013:

Restricted Stock

Number of

Weighted Average

Grant-Date

Fair Value

Unvested at January 1, 2013

352,827

50.1

Granted

297,123

55.35

Vested

(72,661

)

44.57

Forfeited

(74,707

)

53.69

Unvested at December 31, 2013

502,582

53.47

As of December 31, 2013, there was $19.6 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 3.5 years. The total fair value of restricted stock vested during 2013, 2012 and 2011 was $4.4 million, $3.3 million and $3.7 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 and Adjusted EBITDA margin and also includes continued service conditions. For the 2013 performance awards, the Committee added a performance metric related to Total Recordable Incident Rate, which is a measure of the rate of recordable workplace injuries, normalized per 100 workers per year.

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 then considered probable. The expected forfeiture rate used to calculate compensation expense was 7% for non-executive employees and 4% for executives.

For the performance stock awards granted in 2013, the Compensation Committee of the Company's Board of Directors established two-year performance targets which could potentially be achieved in either 2013 or 2014. As of December 31, 2013, management determined that none of the three performance criteria was considered probable to be achieved and as a result no stock-based compensation expense was recorded for the year ended December 31, 2013 with respect to the performance stock awards.

For the performance stock awards granted in 2012, the Compensation Committee of the Company's Board of Directors established two-year performance targets which could potentially be achieved in either 2012 or 2013. As of December 31, 2013, the performance targets related to the 2012 performance stock awards were not met and therefore the performance stock awards granted in 2012 were forfeited.

For the performance stock awards granted in 2011, the Compensation Committee of the Company's Board of Directors established two-year performance targets which could potentially be achieved in either 2011 or 2012. Based on the Company's performance during 2011, management determined that those performance targets had been achieved and the Company therefore recognized cumulative expense through sales, general and administrative expenses for the years ended December 31, 2012 and 2011 with respect to the performance stock awards granted in 2011.

The following table summarizes information about performance stock awards for the year ended December 31, 2013:

Performance Stock

Number of

Weighted Average

Grant-Date

Fair Value

Unvested at January 1, 2013

65,336

66.96

Granted

114,453

54.27

Forfeited

(69,928

)

66.12

Unvested at December 31, 2013

109,861

54.27

As of December 31, 2013, there was no unrecognized compensation cost arising from non-vested compensation related to performance stock awards then deemed probable of vesting under the Company's Plans. During 2013 no performance awards vested. The total fair value of performance awards vested during 2012 and 2011 was $6.0 million and $16.8 million, respectively.

Common Stock Awards

In the years ended December 31, 2013 and 2012, the Company did not issue any shares of common stock without restrictions under the Company's Plans.

Employee Stock Purchase Plan

In May of 1995, the Company's stockholders approved an Employee Stock Purchase Plan (the "ESPP"), which is a qualified employee stock purchase plan under Section 423 of the Internal Revenue Code of 1986, as amended, through which employees of the Company are given the opportunity to purchase shares of common stock. Under the ESPP, a total of 2.0 million shares of common stock were originally reserved for offering to employees, in quarterly offerings of 100,000 shares each plus any shares not issued in any previous quarter, commencing on July 1, 1995 and on the first day of each quarter thereafter. In 2005, the Company's stockholders approved an increase of 1.0 million in the maximum number of shares which can be issued under the ESPP. As of December 31, 2013, the Company had reserved 340,780 shares of common stock available for purchase under the ESPP. Employees who elect to participate in an offering may utilize up to 10% of their payroll for the purchase of common stock at 85% of the closing price of the stock on the first day of such quarterly offering or, if lower, 85% of the closing price on the last day of the offering. Due to the discount of 15% offered to employees for purchase of shares under the ESPP, the Company considers such plan as compensatory. The weighted average per share fair values of the purchase rights granted under the ESPP during the years ended December 31, 2013 and 2012 was $9.61 and $10.29, respectively.

Employee Benefit Plans

As of December 31, 2013, the Company has responsibility for a defined benefit plan that covered 20 active non-supervisory Canadian employees. For the years ended December 31, 2013, 2012 and 2011, net periodic pension cost was $0.3 million, $0.3 million and $0.2 million, respectively. At December 31, 2013, the fair value of the Company's plan assets was $9.5 million. The fair value of $7.6 million of these plan assets was considered a Level 1 measure and the fair value of $1.9 million of these plan assets was considered a Level 2 measure, according to the fair value hierarchy. At December 31, 2012, the fair value of the Company's plan assets was $8.6 million. The fair value of $6.5 million of these plan assets was considered a Level 1 measure and the fair value of $2.1 million of these plan assets was considered a Level 2 measure, according to the fair value hierarchy. As of December 31, 2013 and 2012, the projected benefit obligation was $10.3 million and $9.9 million, respectively.

The Company has a profit-sharing plan under Section 401(k) of the Internal Revenue Code covering substantially all U.S. employees and a Canadian registered retired savings plan covering all Canadian employees. Both plans allow employees to make contributions up to a specified percentage of their compensation. The Company makes discretionary partial matching contributions established annually by the Board of Directors. The Company expensed $8.9 million, $4.8 million, and $3.9 million for the years ended December 31, 2013, 2012 and 2011, respectively, related to the U.S. plan and $3.1 million, $2.1 million and $1.6 million for the years ended December 31, 2013, 2012 and 2011, respectively, related to the Canadian plan.

COMMITMENTS_AND_CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Dec. 31, 2013
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 December 31, 2013 and December 31, 2012, the Company had recorded reserves of $41.7 million and $38.6 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 December 31, 2013 and December 31, 2012, the Company also believed that it was reasonably possible that the amount of these potential liabilities could be as much as $3.5 million more. 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 December 31, 2013, the $41.7 million of reserves consisted of (i) $34.6 million related to pending legal or administrative proceedings, including Superfund liabilities, which were included in remedial liabilities on the consolidated balance sheets, and (ii) $7.1 million primarily related to federal and state enforcement actions, which were included in accrued expenses on the consolidated balance sheets. The reasonably possible additional liability amounts resulting from the legal or administrative proceedings discussed below included $3.5 million related to remedial liabilities which was included in the reasonably possible additional liability amounts in the tables under the column heading "Remedial Liabilities (Including Superfund Liabilities) for Non-Landfill Operations" in Note 9, "Remedial Liabilities."
	As of December 31, 2013, the principal legal and administrative proceedings in which the Company was involved, or which had been terminated during 2013, 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 that are scheduled to be heard in September of 2014. 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 December 31, 2013 and December 31, 2012, the Company had accrued $13.6 million and $14.2 million, respectively, for remedial liabilities relating to the Ville Mercier legal proceedings. The decrease was primarily due to a weakening of the Canadian dollar.
	Safety-Kleen Legal Proceedings. On December 28, 2012, the Company acquired Safety-Kleen and thereby became subject to the legal proceedings in which Safety-Kleen was a party on that date. In addition to certain Superfund proceedings in which Safety-Keen 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 December 31, 2013 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 66 proceedings (excluding cases which have been settled but not formally dismissed) as of December 31, 2013, 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 December 31, 2013. From December 31, 2012 to December 31, 2013, 26 product liability claims were settled or dismissed. Due to the nature of these claims and the related insurance, Safety-Kleen 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. Safety-Kleen disputes the basis of the claims on numerous grounds, including that Safety-Kleen has contracts with numerous customers authorizing the assessment of such fees and that in cases where no contract exists Safety-Kleen provides customers with a document at the time of service reflecting the assessment of the fee, followed by an invoice itemizing the fee. It is Safety-Kleen's position that it had the right to assess fuel surcharges, that the customers consented to the charges and that the surcharges were voluntarily paid by the customers when presented with an invoice. The lawsuit is still in its initial stages of discovery, with the focus being whether a class will be certified. The class certification-related fact discovery cutoff was September 4, 2013, and a hearing on class certification is now scheduled to be held in early to mid-2014. The plaintiff has filed a motion to extend the discovery cutoff and trial date, but the court has not ruled on these requests. In late June 2012, a nearly identical lawsuit was filed by the same law firm on behalf of a California-based customer. That lawsuit contends, under various state law theories, that Safety-Kleen impermissibly assessed fuel surcharges and late payment fees and seeks certification of a class of California customers only. Safety-Kleen will assert the same defenses as in the Alabama litigation. In December 2012, a similar suit was filed by the same law firm on behalf of a Missouri-based customer which contends under various state law theories that Safety-Kleen impermissibly assessed fuel surcharges and seeks certification of a class of Missouri customers only. Safety-Kleen will assert the same defenses as in the Alabama and California cases. The Company is unable to ascertain the ultimate aggregate amount of monetary liability or financial impact with respect to these matters as of December 31, 2013, and no reserve has been recorded.
	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 123 sites which are subject to or are proposed to become subject to proceedings under federal or state Superfund laws. Of the 123 sites, two (the Wichita Facility and the BR Facility described below) involve facilities that are now owned by the Company and 121 involve third party sites to which either the Company or the prior owners of certain of the Company’s facilities shipped wastes. Of the 121 third party sites, 20 are currently requiring expenditures on remediation, 29 are now settled, and 72 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 16 of the 121 third party sites.
	Wichita Property. The Company acquired in 2002 as part of the CSD assets 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 (the "LDEQ"), 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 121 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 121 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 December 31, 2013 and 2012, there were five 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.
	Leases
	The Company leases facilities, service centers and personal property under certain operating leases. Some of these lease agreements contain an escalation clause for increased taxes and operating expenses and are renewable at the option of the Company. The Company also leases certain equipment under capital lease obligations, which consists primarily of rolling stock and laboratory equipment. Lease terms range from one to 25 years. The following is a summary of future minimum payments under capital and operating leases that have initial or remaining noncancelable lease terms in excess of one year at December 31, 2013 (in thousands):


	Year	Total		Total
		Capital		Operating
		Leases		Leases
	2014	$	1,472	$	46,222

	2015	1,458		35,875

	2016	—		27,891

	2017	—		20,433

	2018	—		14,571

	Thereafter	—		30,606

	Total minimum lease payments	2,930		$	175,598

	Less: imputed interest at interest rates ranging from 4.0% to 16.0%	166

	Present value of future minimum lease payments	2,764

	Less: current portion of capital lease obligations	1,329

	Long-term capital lease obligations	$	1,435

	During the years ended December 31, 2013, 2012 and 2011, rent expense including short-term rentals was approximately $124.4 million, $102.9 million, and $86.7 million, respectively.
	Other Contingencies
	Under the Company's insurance programs, coverage is obtained for catastrophic exposures, as well as those risks required to be insured by law or contract. The Company's policy is to retain a significant portion of certain expected losses related primarily to workers' compensation, health insurance, comprehensive general, environmental impairment and vehicle liability. Provisions for losses expected under these programs are recorded based upon the Company's estimates of the aggregate liability for claims. The deductible per participant per year for the health insurance policy ranges from $0.25 million to $0.275 million. The deductible per occurrence for workers' compensation is $1.0 million, general liability is $2.0 million and vehicle liability is $2.0 million. The retention per claim for the environmental impairment policy is $1.0 million. At December 31, 2013 and 2012, the Company had accrued $33.1 million and $35.1 million, respectively, for its self-insurance liabilities (exclusive of health insurance) using a risk-free discount rate of 0.9% and 0.5%, respectively. Actual expenditures in future periods can differ materially from accruals based on estimates.
	Anticipated payments at December 31, 2013 for each of the next five years and thereafter are as follows (in thousands):


	Years ending December 31,
	2014	$	12,581

	2015	7,549

	2016	5,820

	2017	2,618

2018	2,183

Thereafter	2,862

Undiscounted self-insurance liabilities	33,613

Less: Discount	469

Total self-insurance liabilities (included in accrued expenses)	$	33,144

SEGMENT_REPORTING

SEGMENT REPORTING	12 Months Ended
SEGMENT REPORTING	Dec. 31, 2013
Segment Reporting [Abstract]	'
SEGMENT REPORTING	'
	SEGMENT REPORTING
	During 2013, the Company’s operations were managed in five reportable segments: Technical Services, Oil Re-refining and Recycling, SK Environmental Services, Industrial and Field Services and Oil and Gas Field Services. Performance of the segments is evaluated on several factors, of which the primary financial measure is "Adjusted EBITDA," which consists of net income plus accretion of environmental liabilities, depreciation and amortization, net interest expense, and provision for income taxes. Also excluded are other expense (income), loss on early extinguishment of debt and pre-tax, non-cash acquisition accounting inventory adjustments as these amounts are not considered part of usual business operations. Transactions between the segments are accounted for at the Company's estimate based on similar transactions with outside customers.
	The operations not managed through the Company's five 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 five 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 five segments.
	As stated in Note 3, “Business Combinations,” no revenue, expense, income or loss of Safety-Kleen was included in the Company's consolidated results of operations for the year ended December 31, 2012 due to the immateriality of the operating results subsequent to the December 28, 2012 acquisition date. In addition, the December 31, 2012 balance sheet has been adjusted for purchase price measurement period adjustments related to the Safety-Kleen acquisition and has been labeled "As Adjusted."
	The following table reconciles third party revenues to direct revenues for the years ended December 31, 2013, 2012 and 2011 (in thousands). Third party revenue is revenue billed to outside customers by a particular segment. Direct revenue is the revenue allocated to the segment performing the provided service. The Company analyzes results of operations based on direct revenues because the Company believes that these revenues and related expenses best reflect the manner in which operations are managed. 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 revenues from other segments.


		For the Year Ended December 31, 2013
		Technical			Oil Re-refining and Recycling				SK Environmental Services		Industrial			Oil and Gas Field			Corporate			Totals
		Services			Oil Re-refining and Recycling				SK Environmental Services		and Field Services			Services			Items			Totals
	Third party revenues	$	1,023,926		$	583,567			$	610,076	$	908,556		$	392,472		$	(8,941	)	$	3,509,656
	Third party revenues	$	1,023,926		$	583,567			$	610,076	$	908,556		$	392,472		$	(8,941	)	$	3,509,656
	Intersegment revenues, net	120,382			(246,586		)		160,585		(41,751		)	7,370			—			—
	Intersegment revenues, net	120,382			(246,586		)		160,585		(41,751		)	7,370			—			—
	Corporate Items, net	3,507			—				84		174			(342		)	(3,423		)	—
	Corporate Items, net	3,507			—				84		174			(342		)	(3,423		)	—
	Direct revenues	$	1,147,815		$	336,981			$	770,745	$	866,979		$	399,500		$	(12,364	)	$	3,509,656
	Direct revenues	$	1,147,815		$	336,981			$	770,745	$	866,979		$	399,500		$	(12,364	)	$	3,509,656


		For the Year Ended December 31, 2012
		Technical			Oil Re-refining and Recycling				SK Environmental Services		Industrial			Oil and Gas Field			Corporate			Totals
		Services			Oil Re-refining and Recycling				SK Environmental Services		and Field Services			Services			Items			Totals
	Third party revenues	$	957,764		$	—			$	—	$	828,119		$	400,549		$	1,476		$	2,187,908
	Third party revenues	$	957,764		$	—			$	—	$	828,119		$	400,549		$	1,476		$	2,187,908
	Intersegment revenues, net	31,637			—				—		(40,930		)	9,293			—			—
	Intersegment revenues, net	31,637			—				—		(40,930		)	9,293			—			—
	Corporate Items, net	2,295			—				—		64			(489		)	(1,870		)	—
	Corporate Items, net	2,295			—				—		64			(489		)	(1,870		)	—
	Direct revenues	$	991,696		$	—			$	—	$	787,253		$	409,353		$	(394	)	$	2,187,908
	Direct revenues	$	991,696		$	—			$	—	$	787,253		$	409,353		$	(394	)	$	2,187,908


		For the Year Ended December 31, 2011
		Technical			Oil Re-refining and Recycling				SK Environmental Services		Industrial			Oil and Gas Field			Corporate			Totals
		Services			Oil Re-refining and Recycling				SK Environmental Services		and Field Services (1)			Services			Items			Totals
	Third party revenues	$	910,896		$	—			$	—	$	731,626		$	340,563		$	1,051		$	1,984,136
	Third party revenues	$	910,896		$	—			$	—	$	731,626		$	340,563		$	1,051		$	1,984,136
	Intersegment revenues, net	32,340			—				—		(35,370		)	3,030			—			—
	Intersegment revenues, net	32,340			—				—		(35,370		)	3,030			—			—
	Corporate Items, net	2,505			—				—		(363		)	(401		)	(1,741		)	—
	Corporate Items, net	2,505			—				—		(363		)	(401		)	(1,741		)	—
	Direct revenues	$	945,741		$	—			$	—	$	695,893		$	343,192		$	(690	)	$	1,984,136
	Direct revenues	$	945,741		$	—			$	—	$	695,893		$	343,192		$	(690	)	$	1,984,136
	_______________________________________

	-1	During the year ended December 31, 2011, third party revenues for the Industrial and Field Services segment included revenues of $43.6 million associated with the oil spill response efforts in Montana.
	The following table presents information used by management by reported segment (in thousands). The Company does not allocate interest expense, income taxes, depreciation, amortization, accretion of environmental liabilities, other (income) expense, and loss on early extinguishment of debt to segments.


		For the Year Ended December 31,
		2013			2012				2011
	Adjusted EBITDA:
	Technical Services	$	285,520		$	249,829			$	240,494
	Technical Services	$	285,520		$	249,829			$	240,494
	Oil Re-refining and Recycling	57,314			—				—
	Oil Re-refining and Recycling	57,314			—				—
	SK Environmental Services	112,413			—				—
	SK Environmental Services	112,413			—				—
	Industrial and Field Services	176,952			158,931				136,380
	Industrial and Field Services	176,952			158,931				136,380
	Oil and Gas Field Services	68,063			77,048				77,870
	Oil and Gas Field Services	68,063			77,048				77,870
Corporate Items	(190,157		)	(112,041		)		(104,736		)
Total	510,105			373,767				350,008
Total	510,105			373,767				350,008
Reconciliation to Consolidated Statements of Income:
Pre-tax, non-cash acquisition accounting inventory adjustment	13,559			—				—
	13,559			—				—
Accretion of environmental liabilities	11,541			9,917				9,680
Accretion of environmental liabilities	11,541			9,917				9,680
Depreciation and amortization	264,449			161,646				122,663
Depreciation and amortization	264,449			161,646				122,663
Income from operations	220,556			202,204				217,665
Income from operations	220,556			202,204				217,665
Other (income) expense	(1,705		)	802				(6,402		)
Other (income) expense	(1,705		)	802				(6,402		)
Loss on early extinguishment of debt	—			26,385				—
Loss on early extinguishment of debt	—			26,385				—
Interest expense, net of interest income	78,376			47,287				39,389
Interest expense, net of interest income	78,376			47,287				39,389
Income from operations before provision (benefit) for income taxes	$	143,885		$	127,730			$	184,678
	$	143,885		$	127,730			$	184,678
Revenue, property, plant and equipment and intangible assets outside of the United States
For the year ended December 31, 2013, the Company generated $2,376.2 million or 67.7% of revenues in the United States and Puerto Rico, $1,125.0 million or 32.1% of revenues in Canada, and less than 1.0% of revenues in other international locations. For the year ended December 31, 2012, the Company generated $1,254.2 million or 57.3% of revenues in the United States and Puerto Rico, $933.0 million or 42.6% of revenues in Canada, and less than 1.0% of revenues in other international locations. For the year ended December 31, 2011, the Company generated $1,149.4 million or 57.9% of revenues in the United States and Puerto Rico, $833.6 million or 42.0% of revenues in Canada, and less than 1.0% of revenues in other international locations.
As of December 31, 2013, the Company had property, plant and equipment, net of depreciation and amortization of $1,602.2 million, and permits and other intangible assets of $570.0 million. Of these totals, $652.0 million or 40.7% of property, plant and equipment and $110.8 million or 19.4% of permits and other intangible assets were in Canada, with the balance being in the United States and Puerto Rico (except for insignificant assets in other foreign countries). As of December 31, 2012, the Company had property, plant and equipment, net of depreciation and amortization of $1,533.1 million, and permits and other intangible assets of $590.0 million. Of these totals, $642.1 million or 41.9% of property, plant and equipment and $74.1 million or 12.6% of permits and other intangible assets were in Canada, with the balance being in the United States and Puerto Rico (except for insignificant assets in other foreign countries).
The purchase price measurement period adjustments related to the Safety-Kleen acquisition have been reflected in the December 31, 2012 amounts presented below.
The following table presents assets by reported segment and in the aggregate (in thousands).


	December 31, 2013			31-Dec-12
	December 31, 2013			(As Adjusted)
Property, plant and equipment, net
Technical Services	$	400,544		$	405,447
Technical Services	$	400,544		$	405,447
Oil Re-refining and Recycling	211,513			178,210
Oil Re-refining and Recycling	211,513			178,210
SK Environmental Services	239,596			239,993
SK Environmental Services	239,596			239,993
Industrial and Field Services	405,327			371,386
Industrial and Field Services	405,327			371,386
Oil and Gas Field Services	237,335			257,985
Oil and Gas Field Services	237,335			257,985
Corporate Items	107,855			80,032
Corporate Items	107,855			80,032
Total property, plant and equipment, net	$	1,602,170		$	1,533,053
Total property, plant and equipment, net	$	1,602,170		$	1,533,053
Intangible assets:
Technical Services
Goodwill	$	45,599		$	45,991
Goodwill	$	45,599		$	45,991
Permits and other intangibles, net	80,302			86,403
Permits and other intangibles, net	80,302			86,403
Total Technical Services	125,901			132,394
Total Technical Services	125,901			132,394
Oil Re-refining and Recycling
Goodwill	171,161			173,158
Goodwill	171,161			173,158
Permits and other intangibles, net	160,807			151,840
Permits and other intangibles, net	160,807			151,840
Total Oil Re-refining and Recycling Services	331,968			324,998
Total Oil Re-refining and Recycling Services	331,968			324,998
SK Environmental Services
Goodwill	172,308			174,089
Goodwill	172,308			174,089
Permits and other intangibles, net	265,104			277,460
Permits and other intangibles, net	265,104			277,460
Total SK Environmental Services	437,412			451,549
Total SK Environmental Services	437,412			451,549
Industrial and Field Services
Goodwill	144,385			146,715
Goodwill	144,385			146,715
Permits and other intangibles, net	35,332			41,163
Permits and other intangibles, net	35,332			41,163
Total Industrial and Field Services	179,717			187,878
Total Industrial and Field Services	179,717			187,878
Oil and Gas Field Services
Goodwill	37,507			39,762
Goodwill	37,507			39,762
Permits and other intangibles, net	28,428			33,178
Permits and other intangibles, net	28,428			33,178
Total Oil and Gas Field Services	65,935			72,940
Total Oil and Gas Field Services	65,935			72,940
Total	$	1,140,933		$	1,169,759
Total	$	1,140,933		$	1,169,759
The following table presents the total assets by reported segment (in thousands).


	December 31, 2013			31-Dec-12
	December 31, 2013			(As Adjusted)
Technical Services	$	699,675		$	716,309
Technical Services	$	699,675		$	716,309
Oil Re-Recycling and Refining	643,256			636,745
Oil Re-Recycling and Refining	643,256			636,745
SK Environmental Services	774,401			815,446
SK Environmental Services	774,401			815,446
Industrial and Field Services	634,541			612,664
Industrial and Field Services	634,541			612,664
Oil and Gas Field Services	395,805			348,771
Oil and Gas Field Services	395,805			348,771
Corporate Items	806,000			708,151
Corporate Items	806,000			708,151
Total	$	3,953,678		$	3,838,086
Total	$	3,953,678		$	3,838,086
The following table presents the total assets by geographical area (in thousands).


	December 31, 2013			31-Dec-12
	December 31, 2013			(As Adjusted)
United States	$	2,684,686		$	2,555,926
United States	$	2,684,686		$	2,555,926
Canada	1,266,505			1,281,384
Canada	1,266,505			1,281,384
Other foreign	2,487			776
Other foreign	2,487			776
Total	$	3,953,678		$	3,838,086
Total	$	3,953,678		$	3,838,086

GUARANTOR_AND_NONGUARANTOR_SUB

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES	12 Months Ended
	Dec. 31, 2013
Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract]	'
GUARANTOR AND NON-GUARANTOR SUBSIDIARIES	'
	GUARANTOR AND NON-GUARANTOR SUBSIDIARIES
	The 2020 Notes and the 2021 Notes are, and the 2016 Notes were, guaranteed by substantially all of the Company’s subsidiaries organized in the United States. Each guarantor for the 2020 Notes and the 2021 Notes is, and for the 2016 Notes was, a 100% owned subsidiary of the Company and its guarantee is, or was, both full and unconditional and joint and several. The 2020 Notes and the 2021 Notes are, and the 2016 Notes were, 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.
	Following is the condensed consolidating balance sheet at December 31, 2013 (in thousands):


		Clean			U.S. Guarantor			Foreign			Consolidating				Total
		Harbors, Inc.			Subsidiaries			Non-Guarantor			Adjustments
								Subsidiaries
	Assets:
	Cash and cash equivalents	$	1,006		$	235,445		$	73,622		$	—			$	310,073

	Intercompany receivables	269,580			2,448			230,224			(502,252		)		—

	Accounts receivable, net	—			387,006			192,388			—				579,394

	Other current assets	24,087			182,881			74,744			—				281,712

	Property, plant and equipment, net	—			945,280			656,890			—				1,602,170

	Investments in subsidiaries	2,683,158			967,186			144,953			(3,795,297		)		—

	Intercompany debt receivable	—			493,402			3,701			(497,103		)		—

	Goodwill	—			415,541			155,419			—				570,960

	Permits and other intangibles, net	—			458,917			111,056			—				569,973

	Other long-term assets	23,770			7,018			8,608			—				39,396

	Total assets	$	3,001,601		$	4,095,124		$	1,651,605		$	(4,794,652	)		$	3,953,678

	Liabilities and Stockholders' Equity:
	Current liabilities	$	33,626		$	466,454		$	139,465		$	—			$	639,545

	Intercompany payables	—			499,749			2,503			(502,252		)		—

	Closure, post-closure and remedial liabilities, net	—			158,298			31,814			—				190,112

	Long-term obligations	1,400,000			—			—			—				1,400,000

	Capital lease obligations, net	—			191			1,244			—				1,435

	Intercompany debt payable	3,701			—			493,402			(497,103		)		—

	Other long-term liabilities	88,635			103,125			55,187			—				246,947

	Total liabilities	1,525,962			1,227,817			723,615			(999,355		)		2,478,039

	Stockholders' equity	1,475,639			2,867,307			927,990			(3,795,297		)		1,475,639

	Total liabilities and stockholders' equity	$	3,001,601		$	4,095,124		$	1,651,605		$	(4,794,652	)		$	3,953,678

	Following is the condensed consolidating balance sheet at December 31, 2012 as adjusted (in thousands):


		Clean			U.S. Guarantor			Foreign			Consolidating				Total
		Harbors, Inc.			Subsidiaries			Non-Guarantor			Adjustments
								Subsidiaries
	Assets:
	Cash and cash equivalents	$	35,214		$	140,683		$	53,939		$	—			$	229,836

	Intercompany receivables	296,023			17,704			116,571			(430,298		)		—

Accounts receivable, net	—			345,891			200,245			—				546,136

Other current assets	38,295			186,640			94,352			—				319,287

Property, plant and equipment, net	—			881,975			651,078			—				1,533,053

Investments in subsidiaries	2,528,699			850,011			144,953			(3,523,663		)		—

Intercompany debt receivable	—			508,067			3,701			(511,768		)		—

Goodwill	—			413,362			166,353			—				579,715

Permits and other intangibles, net	—			464,455			125,589			—				590,044

Other long-term assets	21,141			9,125			9,749			—				40,015

Total assets	$	2,919,372		$	3,817,913		$	1,566,530		$	(4,465,729	)		$	3,838,086

Liabilities and Stockholders' Equity:
Current liabilities	$	32,586		$	417,429		$	138,651		$	—			$	588,666

Intercompany payables	—			412,594			17,704			(430,298		)		—

Closure, post-closure and remedial liabilities, net	—			164,506			34,551			—				199,057

Long-term obligations	1,400,000			—			—			—				1,400,000

Capital lease obligations, net	—			301			2,578			—				2,879

Intercompany debt payable	3,701			—			508,067			(511,768		)		—

Other long-term liabilities	51,013			108,694			55,705			—				215,412

Total liabilities	1,487,300			1,103,524			757,256			(942,066		)		2,406,014

Stockholders' equity	1,432,072			2,714,389			809,274			(3,523,663		)		1,432,072

Total liabilities and stockholders' equity	$	2,919,372		$	3,817,913		$	1,566,530		$	(4,465,729	)		$	3,838,086

Following is the consolidating statement of income for the year ended December 31, 2013 (in thousands):


	Clean			U.S. Guarantor			Foreign			Consolidating				Total
	Harbors, Inc.			Subsidiaries			Non-Guarantor			Adjustments
							Subsidiaries
Revenues
Service revenues	$	—		$	1,754,356		$	989,620		$	(14,771	)		$	2,729,205

Product revenues	—			611,548			173,127			(4,224		)		780,451

Total revenues	—			2,365,904			1,162,747			(18,995		)		3,509,656

Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			1,187,946			701,273			(14,771		)		1,874,448

Product cost of revenues	—			524,318			148,091			(4,224		)		668,185

Total cost of revenues	—			1,712,264			849,364			(18,995		)		2,542,633

Selling, general and administrative expenses	109			352,387			117,981			—				470,477

Accretion of environmental liabilities	—			9,817			1,724			—				11,541

Depreciation and amortization	—			169,629			94,820			—				264,449

Income from operations	(109		)	121,807			98,858			—				220,556

Other income (expense)	—			3,211			(1,506		)	—				1,705

Interest (expense) income, net	(79,017		)	224			417			—				(78,376		)

Equity in earnings of subsidiaries	184,498			79,427			—			(263,925		)		—

Intercompany dividend income (expense)	—			—			13,292			(13,292		)		—

Intercompany interest income (expense)	—			40,304			(40,304		)	—				—

Income (loss) before provision for income taxes	105,372			244,973			70,757			(277,217		)		143,885

Provision for income taxes	9,806			23,113			15,400			—				48,319

Net income (loss)	95,566			221,860			55,357			(277,217		)		95,566

Other comprehensive (loss) income	(69,188		)	(69,188		)	39,519			29,669				(69,188		)

Comprehensive income (loss)	$	26,378		$	152,672		$	94,876		$	(247,548	)		$	26,378














Following is the consolidating statement of income for the year ended December 31, 2012 (in thousands):


	Clean			U.S. Guarantor			Foreign			Consolidating				Total
	Harbors, Inc.			Subsidiaries			Non-Guarantor			Adjustments
							Subsidiaries
Revenues
Service revenues	—			1,155,993			927,240			(20,073		)		2,063,160

Product revenues	—			87,460			38,500			(1,212		)		124,748

Total revenues	—			1,243,453			965,740			(21,285		)		2,187,908

Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			787,228			672,439			(20,073		)		1,439,594

Product cost of revenues	—			70,085			32,154			(1,212		)		101,027

Total cost of revenues	—			857,313			704,593			(21,285		)		1,540,621

Selling, general and administrative expenses	66			173,190			100,264			—				273,520

Accretion of environmental liabilities	—			8,592			1,325			—				9,917

Depreciation and amortization	—			80,154			81,492			—				161,646

Income from operations	(66		)	124,204			78,066			—				202,204

Other income	—			(154		)	(648		)	—				(802		)

Loss on early extinguishment of debt	(26,385		)	—			—			—				(26,385		)

Interest (expense), net	(46,221		)	—			(1,066		)	—				(47,287		)

Equity in earnings of subsidiaries	187,432			65,452			—			(252,884		)		—

Intercompany dividend income (expense)	10,010			—			13,805			(23,815		)		—

Intercompany interest income (expense)	—			41,636			(41,636		)	—				—

Income before provision for income taxes	124,770			231,138			48,521			(276,699		)		127,730

(Benefit) provision for income taxes	(4,904		)	(8,852		)	11,812			—				(1,944		)

Net income	129,674			239,990			36,709			(276,699		)		129,674

Other comprehensive income (loss)	18,279			18,279			7,986			(26,265		)		18,279

Comprehensive income (loss)	$	147,953		$	258,269		$	44,695		$	(302,964	)		$	147,953













Following is the consolidating statement of income for the year ended December 31, 2011 (in thousands):


	Clean			U.S. Guarantor			Foreign			Consolidating				Total
	Harbors, Inc.			Subsidiaries			Non-Guarantor			Adjustments
							Subsidiaries
Revenues
Service revenues	—			1,055,095			854,306			(26,422		)		1,882,979

Product revenues	—			86,840			15,737			(1,420		)		101,157

Total revenues	—			1,141,935			870,043			(27,842		)		1,984,136

Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			720,189			607,596			(26,422		)		1,301,363

Product cost of revenues	—			66,582			13,466			(1,420		)		78,628

Total cost of revenues	—			786,771			621,062			(27,842		)		1,379,991

Selling, general and administrative expenses	100			165,882			88,155			—				254,137

Accretion of environmental liabilities	—			8,442			1,238			—				9,680

Depreciation and amortization	—			58,328			64,335			—				122,663

Income from operations	(100		)	122,512			95,253			—				217,665

Other income	—			3,864			2,538			—				6,402

Interest (expense) income, net	(38,755		)	18			(652		)	—				(39,389		)

Equity in earnings of subsidiaries	174,029			84,789			—			(258,818		)		—

Intercompany dividend income (expense)	10,186			—			13,832			(24,018		)		—

Intercompany interest income (expense)	—			37,870			(37,870		)	—				—

Income from continuing operations before provision for income taxes	145,360			249,053			73,101			(282,836		)		184,678

Provision for income taxes	18,108			29,341			9,977			—				57,426

Net income	127,252			219,712			63,124			(282,836		)		127,252

Other comprehensive income (loss)	(19,406		)	(19,406		)	(8,381		)	27,787				(19,406		)

Comprehensive income (loss)	$	107,846		$	200,306		$	54,743		$	(255,049	)		$	107,846

Following is the condensed consolidating statement of cash flows for the year ended December 31, 2013 (in thousands):


	Clean			U.S. Guarantor			Foreign			Total
	Harbors, Inc.			Subsidiaries			Non-Guarantor
							Subsidiaries
Net cash from operating activities	$	(33,932	)	$	264,491		$	185,280		$	415,839

Cash flows from investing activities:
Additions to property, plant and equipment	—			(145,395		)	(134,812		)	(280,207		)

Proceeds from sales of fixed assets	—			1,078			3,621			4,699

Acquisitions, net of cash acquired	(6,025		)	(57,239		)	—			(63,264		)

Additions to intangible assets including costs to obtain or renew permits	—			(5,247		)	(1,493		)	(6,740		)

Net cash used in investing activities	(6,025		)	(206,803		)	(132,684		)	(345,512		)
Cash flows from financing activities:
Change in uncashed checks	—			9,922			2,346			12,268

Proceeds from exercise of stock options	400			—			—			400

Remittance of shares, net	(731		)	—			—			(731		)

Excess tax benefit of stock-based compensation	1,409			—			—			1,409

Deferred financing costs paid	(2,504		)	—			—			(2,504		)

Proceeds from employee stock purchase plan	7,425			—			—			7,425

Payments on capital leases	—			(227		)	(4,664		)	(4,891		)

Issuance costs related to issuances of common stock	(250		)	—			—			(250		)

Dividends (paid)/received	—			(13,545		)	13,545			—

Interest (payments) / received	—			40,924			(40,924		)	—

Net cash from financing activities	5,749			37,074			(29,697		)	13,126

Effect of exchange rate change on cash	—			—			(3,216		)	(3,216		)

(Decrease) increase in cash and cash equivalents	(34,208		)	94,762			19,683			80,237

Cash and cash equivalents, beginning of year	35,214			140,683			53,939			229,836

Cash and cash equivalents, end of year	$	1,006		$	235,445		$	73,622		$	310,073

Following is the condensed consolidating statement of cash flows for the year ended December 31, 2012 (in thousands):


	Clean			U.S. Guarantor			Foreign			Total
	Harbors, Inc.			Subsidiaries			Non-Guarantor
							Subsidiaries
Net cash from operating activities	$	(45,655	)	$	179,425		$	190,595		$	324,365

Cash flows from investing activities:
Additions to property, plant and equipment	—			(117,344		)	(80,053		)	(197,397		)

Proceeds from sales of fixed assets	—			3,810			4,315			8,125

Acquisitions, net of cash acquired	(1,257,259		)	(63,351		)	(53,311		)	(1,373,921		)
Additions to intangible assets including costs to obtain or renew permits	—			(712		)	(3,334		)	(4,046		)

Purchase of marketable securities	—			—			(10,517		)	(10,517		)

Other	—			500			4,620			5,120

Net cash used in investing activities	(1,257,259		)	(177,097		)	(138,280		)	(1,572,636		)
Cash flows from financing activities:
Change in uncashed checks	—			(6,761		)	(5,309		)	(12,070		)

Proceeds from exercise of stock options	288			—			—			288

Remittance of shares, net	(2,912		)	—			—			(2,912		)

Excess tax benefit of stock-based compensation	2,556			—			—			2,556

Deferred financing costs paid	(19,056		)	—			—			(19,056		)

Proceeds from employee stock purchase plan	6,196			—			—			6,196

Payments of capital leases	—			(850		)	(5,749		)	(6,599		)

Proceeds from issuance of common stock, net	369,520			—			—			369,520

Principle payment on debt	(520,000		)	—			—			(520,000		)

Distribution of cash earned on employee participation plan	(55		)	—			—			(55		)

Issuance of senior unsecured notes, at par	1,400,000			—			—			1,400,000

Dividends (paid) / received	10,010			(23,815		)	13,805			—

Interest (payments) / received	—			41,710			(41,710		)	—

Net cash from financing activities	1,246,547			10,284			(38,963		)	1,217,868

Effect of exchange rate change on cash	—			—			(484		)	(484		)

(Decrease) increase in cash and cash equivalents	(56,367		)	12,612			12,868			(30,887		)

Cash and cash equivalents, beginning of year	91,581			128,071			41,071			260,723

Cash and cash equivalents, end of year	$	35,214		$	140,683		$	53,939		$	229,836

Following is the condensed consolidating statement of cash flows for the year ended December 31, 2011 (in thousands):


	Clean			U.S. Guarantor			Foreign			Total
	Harbors, Inc.			Subsidiaries			Non-Guarantor
							Subsidiaries
Net cash from operating activities	$	(17,428	)	$	90,015		$	106,944		$	179,531

Cash flows from investing activities:
Additions to property, plant and equipment	—			(92,531		)	(55,982		)	(148,513		)

Proceeds from sales of fixed assets and assets held for sale	—			657			6,137			6,794

Acquisitions, net of cash acquired	—			(50,166		)	(286,794		)	(336,960		)

Additions to intangible assets including costs to obtain or renew permits	—			(465		)	(2,462		)	(2,927		)

Proceeds from sales of marketable securities	—			—			425			425

Proceeds from sale of long-term investments	—			1,000			—			1,000

Investment in subsidiaries	(258,597		)	178,884			79,713			—

Net cash used in investing activities	(258,597		)	37,379			(258,963		)	(480,181		)

Cash flows from financing activities:
Change in uncashed checks	—			6,558			3,264			9,822

Proceeds from exercise of stock options	1,350			—			—			1,350

Remittance of shares, net	(4,061		)	—			—			(4,061		)

Excess tax benefit of stock-based compensation	3,352			—			—			3,352

Deferred financing costs paid	(8,463		)	—			—			(8,463		)

Proceeds from employee stock purchase plan	3,516			—			—			3,516

Payments of capital leases	—			(820		)	(7,017		)	(7,837		)

Distribution of cash earned on employee participation plan	—			—			(189		)	(189		)

Issuance of senior secured notes, including premium	261,250			—			—			261,250

Dividends received / (paid)	10,186			(24,306		)	14,120			—

Interest received / (payments)	—			35,088			(35,088		)	—

Intercompany debt	—			(140,425		)	140,425			—

Net cash from financing activities	267,130			(123,905		)	115,515			258,740

Effect of exchange rate change on cash	—			—			423			423

(Decrease) increase in cash and cash equivalents	(8,895		)	3,489			(36,081		)	(41,487		)

Cash and cash equivalents, beginning of year	100,476			124,582			77,152			302,210

Cash and cash equivalents, end of year	$	91,581		$	128,071		$	41,071		$	260,723

QUARTERLY_DATA_UNAUDITED

QUARTERLY DATA (UNAUDITED)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
QUARTERLY DATA (UNAUDITED)	'
	QUARTERLY DATA (UNAUDITED)


		First			Second			Third			Fourth
		Quarter			Quarter			Quarter			Quarter
		(in thousands except per share amounts)
	2013
	Revenues	$	862,163		$	860,528		$	907,535		$	879,430

	Cost of revenues (2)	636,024			614,326			647,119			645,164

	Gross profit	226,139			246,202			260,416			234,266

	Income from operations	34,828			53,243			73,608			58,877

	Other income (expense)	525			1,655			(150		)	(325		)

	Net income	10,502			22,902			35,361			26,801

	Basic earnings per share	0.17			0.38			0.58			0.44

	Diluted earnings per share	0.17			0.38			0.58			0.44



		First			Second			Third			Fourth
		Quarter			Quarter			Quarter (1)			Quarter (1)
		(in thousands except per share amounts)
	2012
	Revenues	$	572,022		$	523,118		$	533,806		$	558,962

	Cost of revenues (2)	400,315			367,623			372,940			399,743

	Gross profit	171,707			155,495			160,866			159,219

	Income from operations	61,701			47,533			56,739			36,231

	Other expense	(299		)	(75		)	(91		)	(337		)
	Net income	32,015			23,426			12,359			61,874

	Basic earnings per share	0.6			0.44			0.23			1.11

	Diluted earnings per share	0.6			0.44			0.23			1.11

	______________________________________

	-1	The third quarter 2012 net income and earnings per share were impacted by a $26.4 million loss on early extinguishment of debt in connection with a redemption and repurchase of the Company's $520.0 million previously outstanding senior secured notes. The fourth quarter 2012 net income and earnings per share were impacted by a decrease in unrecognized tax benefits of $52.4 million resulting from expiring statute of limitation periods related to an historical Canadian debt restructuring transaction.

	-2	Items shown separately on the statements of income consist of (i) accretion of environmental liabilities and (ii) depreciation and amortization.
	Earnings per share are computed independently for each of the quarters presented. Accordingly, the quarterly basic and diluted earnings per share may not equal the total computed for the year.

SUBSEQUENT_EVENTS

SUBSEQUENT EVENTS	12 Months Ended
SUBSEQUENT EVENTS	Dec. 31, 2013
Subsequent Events [Abstract]	'
Subsequent Events	'
	SUBSEQUENT EVENTS

	On February 25, 2014, the Company's Board of Directors authorized the repurchase of up to $150 million of the Company's common stock. The Company intends to fund the repurchases through available cash resources. The repurchase program authorizes the Company to purchase the Company's 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. The Company has no obligation to repurchase stock under this program and may suspend or terminate the repurchase program at any time.

	On February 27, 2014, the Company's Executive team and Board of Directors terminated the Company's Employee Stock Purchase Plan (as discussed in Note 15, "Stock-Based Compensation and Employee Benefit Plans"), effective as of March 31, 2014.

SCHEDULE_II_VALUATION_AND_QUAL

SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS	12 Months Ended
	Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]	'
Schedule of Valuation and Qualifying Accounts Disclosure	'
	SCHEDULE II
	VALUATION AND QUALIFYING ACCOUNTS
	For the Three Years Ended December 31, 2013
	(in thousands)



	Allowance for Doubtful Accounts	Balance		Additions Charged to			Deductions from		Balance
		Beginning of		Operating Expense			Reserves(a)		End of Period
		Period
	2011	$	2,084	$	759		$	1,013	$	1,830

	2012	$	1,830	$	1,213		$	1,797	$	1,246

	2013	$	1,246	$	7,933		$	1,825	$	7,354

	________________________________________

	(a)	Amounts deemed uncollectible, net of recoveries.



	Revenue Allowance(b)	Balance		Additions Charged to			Deductions from		Balance
		Beginning of		Revenue			Reserves		End of Period
		Period
	2011	$	21,620	$	13,846		$	24,613	$	10,853

	2012	$	10,853	$	18,847		$	19,821	$	9,879

	2013	$	9,879	$	16,401		$	15,528	$	10,752

	________________________________________

	(b)	Due to the nature of the Company's business and the complex invoices that result from the services provided, customers may withhold payments and attempt to renegotiate amounts invoiced. In addition, for some of the services provided, the Company's invoices are based on quotes that can either generate credits or debits when the actual revenue amount is known. Based on industry knowledge and historical trends, the Company records a revenue allowance accordingly. This practice causes the volume of activity flowing through the revenue allowance during the year to be higher than the balance at the end of the year. Increases in overall sales volumes and the expansion of the customer base in recent years have also increased the volume of additions and deductions to the allowance during the year, as well as increased the amount of the allowance at the end of the year.
	The revenue allowance is intended to cover the net amount of revenue adjustments that may need to be credited to customers' accounts in future periods. Management determines the appropriate total revenue allowance by evaluating the following factors on a customer-by-customer basis as well as on a consolidated level: historical collection trends, age of outstanding receivables, existing economic conditions and other information as deemed applicable. Revenue allowance estimates can differ materially from the actual adjustments, but historically the revenue allowance has been sufficient to cover the net amount of the reserve adjustments issued in subsequent reporting periods.


	Valuation Allowance on Deferred Tax Assets	Balance		Additions (Deductions)			Other Changes		Balance
		Beginning of		Charged to (from) Income			to Reserves(a)		End of Period
		Period		Tax Expense
	2011	$	12,919	$	(1,593	)	$	147	$	11,473

	2012 (As Adjusted)	$	11,473	$	(196	)	$	15,048	$	26,325

	2013	$	26,325	$	(1,545	)	$	4,946	$	29,726

	________________________________________

	(a)	The Safety-Kleen acquisition accounted for $13.8 million of the increase in the valuation allowance as of December 31, 2012.

SIGNIFICANT_ACCOUNTING_POLICIE1

SIGNIFICANT ACCOUNTING POLICIES (Policies)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Principles of Consolidation

Use of Estimates

Reclassifications

Fair Value Valuation Hierarchy

Cash, Cash Equivalents and Uncashed Checks

The Company classifies all highly liquid instruments purchased with maturities of three months or less as cash equivalents.

Marketable Securities

Allowances for Doubtful Accounts

Credit Concentration

Unbilled Receivables

The Company recognizes unbilled accounts receivable for service and disposal transactions rendered but not invoiced to the customer by the end of the period.

Deferred Costs Relating to Deferred Revenue

Inventories and Supplies

Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist primarily of prepayments for various services, refundable deposits, and income taxes receivable.

Property, Plant and Equipment (excluding landfill assets)

The Company depreciates and amortizes the cost of these assets, using the straight-line method as follows:

Asset Classification

Estimated Useful Life

Buildings and building improvements

Buildings

30–40 years

Leasehold and building improvements

2–40 years

Camp equipment

12–15 years

Vehicles

3–12 years

Equipment

Capitalized software and computer equipment

3–5 years

Solar equipment

20 years

Containers and railcars

15–20 years

All other equipment

8–20 years

Furniture and fixtures

5–8 years

Leasehold and building improvements have a weighted average life of 8.8 years.

Camp equipment consists of industrial lodging facilities that are utilized to provide lodging services to downstream oil and gas companies in Western Canada.

Goodwill and Intangible Assets

Leases

Landfill Accounting

•

Management expects to submit the application within the next year and to receive all necessary approvals to accept waste within the next 5 years.

•

The Company or other owner of the landfill has a legal right to use or obtain the right to use the land associated with the expansion plan.

•

There are no significant known political, technical, legal or business restrictions or issues that could impair the success of such expansion.

•

Additional airspace and related additional costs, including permitting, final closure and post-closure costs, have been estimated based on the conceptual design of the proposed expansion.

Remaining

Remaining Highly Probable Airspace

Lives

(cubic yards) (in thousands)

Facility Name

Location

(Years)

Permitted

Unpermitted

Total

Altair

Texas

752

—

752

Buttonwillow

California

7,701

—

7,701

Deer Park

Texas

342

—

342

Deer Trail

Colorado

2,061

—

2,061

Grassy Mountain

Utah

2,058

—

2,058

Kimball

Nebraska

281

—

281

Lambton

Ontario

120

4,708

4,828

Lone Mountain

Oklahoma

2,769

—

2,769

Ryley

Alberta

912

880

1,792

Sawyer

North Dakota

4,007

—

4,007

Westmorland

California

2,732

—

2,732

23,735

5,588

29,323

At December 31, 2013 and 2012, the Company had no cubic yards of permitted, but not highly probable, airspace.

The following table presents the remaining highly probable airspace from January 1, 2011 through December 31, 2013 (in thousands of cubic yards):

2013

2012

2011

Remaining capacity at January 1,

29,643

27,557

28,557

Addition of highly probable airspace, net

1,218

3,598

102

Consumed

(1,538

)

(1,512

)

(1,102

)

Remaining capacity at December 31,

29,323

29,643

27,557

Non-Landfill Closure and Post-Closure Liabilities

Remedial Liabilities

•

Derivative Financial Instruments

Letters of Credit

Foreign Currency

Revenue Recognition and Deferred Revenue

Advertising Expense

Advertising costs are expensed as incurred.

Stock-Based Compensation

Income Taxes

Earnings Per Share (EPS)

Earnings per Share ("EPS")

Business Combinations

Recent Accounting Pronouncements

SIGNIFICANT_ACCOUNTING_POLICIE2

SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Schedule of asset classification and estimated useful life	'
	The Company depreciates and amortizes the cost of these assets, using the straight-line method as follows:


	Asset Classification		Estimated Useful Life
	Buildings and building improvements
	Buildings		30–40 years

	Leasehold and building improvements		2–40 years
	Camp equipment		12–15 years
	Vehicles		3–12 years
	Equipment
	Capitalized software and computer equipment		3–5 years
	Solar equipment		20 years
	Containers and railcars		15–20 years
	All other equipment		8–20 years
	Furniture and fixtures		5–8 years
	Property, plant and equipment consisted of the following (in thousands):


		December 31, 2013			31-Dec-12
					(As Adjusted)
	Land	$	99,794		$	104,379

	Asset retirement costs (non-landfill)	10,938			10,111

	Landfill assets	100,983			77,952

	Buildings and improvements	327,956			359,816

	Camp equipment	187,831			135,827

	Vehicles	425,296			385,172

	Equipment	1,201,296			1,034,856

	Furniture and fixtures	5,260			3,735

	Construction in progress	58,010			34,124

		2,417,364			2,145,972

	Less - accumulated depreciation and amortization	815,194			612,919

	Total property, plant and equipment, net	$	1,602,170		$	1,533,053

Schedule of Property, Plant and Equipment, Landfill Assets	'
	As of December 31, 2013, the Company had 11 active landfill sites (including the Company's two non-commercial landfills), which have estimated remaining lives (based on anticipated waste volumes and remaining highly probable airspace) as follows:


				Remaining		Remaining Highly Probable Airspace
				Lives		(cubic yards) (in thousands)
	Facility Name		Location	(Years)		Permitted			Unpermitted	Total
	Altair		Texas	12		752			—	752

	Buttonwillow		California	27		7,701			—	7,701

	Deer Park		Texas	9		342			—	342

	Deer Trail		Colorado	41		2,061			—	2,061

	Grassy Mountain		Utah	29		2,058			—	2,058

	Kimball		Nebraska	10		281			—	281

	Lambton		Ontario	49		120			4,708	4,828

	Lone Mountain		Oklahoma	17		2,769			—	2,769

	Ryley		Alberta	11		912			880	1,792

	Sawyer		North Dakota	16		4,007			—	4,007

	Westmorland		California	64		2,732			—	2,732

						23,735			5,588	29,323

Remaining Highly Probable Airspace	'
	The following table presents the remaining highly probable airspace from January 1, 2011 through December 31, 2013 (in thousands of cubic yards):


		2013		2012			2011
	Remaining capacity at January 1,	29,643		27,557			28,557

	Addition of highly probable airspace, net	1,218		3,598			102

	Consumed	(1,538	)	(1,512	)		(1,102	)
	Remaining capacity at December 31,	29,323		29,643			27,557

BUSINESS_COMBINATIONS_Tables

BUSINESS COMBINATIONS (Tables)	12 Months Ended
	Dec. 31, 2013
Evergreen Oil, Inc.	'
Business Acquisition [Line Items]	'
Summary of recognized amounts of identifiable assets acquired and liabilities assumed	'
	The following table summarizes the recognized amounts of assets acquired and liabilities assumed at September 13, 2013 (in thousands):


		Preliminary Allocations			Measurement Period Adjustments			Allocations as of December 31, 2013
	Inventories and supplies	$	1,206		$	(117	)	$	1,089

	Prepaid and other current assets	873			418			1,291

	Property, plant and equipment	40,563			—			40,563

	Permits and other intangibles	16,500			600			17,100

	Deferred tax assets, less current portion	—			2,368			2,368

	Other assets	3,607			—			3,607

	Current liabilities	(6,108		)	(90		)	(6,198		)
	Closure and post-closure liabilities	(659		)	—			(659		)

	Remedial liabilities, less current portion	(2,103		)	—			(2,103		)

	Other long-term liabilities	(1,139		)	—			(1,139		)

	Total identifiable net assets	52,740			3,179			55,919

	Goodwill	3,179			(3,179		)	—

	Total	$	55,919		$	—		$	55,919

Safety-Kleen	'
Business Acquisition [Line Items]	'
Summary of recognized amounts of identifiable assets acquired and liabilities assumed	'
	The following table summarizes the recognized amounts of assets acquired and liabilities assumed at December 28, 2012 (in thousands):


		Preliminary Allocations			Measurement Period Adjustments			Final Allocations
	Inventories and supplies	$	102,339		$	5,037		$	107,376

	Other current assets (i)	152,245			3,429			155,674

	Property, plant and equipment	514,712			1,290			516,002

	Permits and other intangibles	421,400			17,227			438,627

	Other assets	4,985			(647		)	4,338

	Current liabilities	(192,652		)	(13,589		)	(206,241		)
	Closure and post-closure liabilities, less current portion	(15,774		)	8,221			(7,553		)

	Remedial liabilities, less current portion	(38,370		)	(9,931		)	(48,301		)
	Deferred taxes, unrecognized tax benefits and other long-term liabilities	(128,375		)	9,044			(119,331		)

	Total identifiable net assets	820,510			20,081			840,591

	Goodwill (ii)	436,749			(14,056		)	422,693

	Total (iii)	$	1,257,259		$	6,025		$	1,263,284

	_______________________

	(i)	The fair value of the assets acquired includes customer receivables with an aggregate fair value of $137.6 million. Combined gross amounts due were $142.7 million.

	(ii)	Goodwill represents the excess of the fair value of the net assets acquired over the purchase price. Based on the final purchase price allocations, goodwill of $173.2 million, $174.1 million and $75.4 million has been recorded in the Oil Re-refining and Recycling, SK Environmental Services and Industrial and Field Services segments, respectively, and will not be deductible for tax purposes.

	(iii)	The $6.0 million increase in the purchase price in 2013 was due to finalization of the net working capital balance (excluding cash) as of the closing date.
Unaudited pro forma combined summary data	'
	The following unaudited pro forma combined summary financial information presented below gives effect to the following transactions as if they had occurred as of January 1, 2011, and assumes that there were no material, non-recurring pro forma adjustments directly attributable to: (i) the acquisition of Safety-Kleen, (ii) the sale of 6.9 million shares of the Company's common stock, (iii) the issuance of $600.0 million aggregate principal amount of 5.125% senior unsecured notes due 2021, and (iv) the payment of related fees and expenses (in thousands).


		2012			2011
	Pro forma combined revenues	$	3,529,592		$	3,245,637

	Pro forma combined net income	$	125,425		$	129,242

Other 2012 Acquisitions	'
Business Acquisition [Line Items]	'
Summary of recognized amounts of identifiable assets acquired and liabilities assumed	'
	The following table summarizes the recognized amounts of assets acquired and liabilities assumed.


	(in thousands)	Preliminary Allocations			Measurement Period Adjustments			Final Allocations
	Current assets (i)	$	20,270		$	117		$	20,387

	Property, plant and equipment	51,901			(8		)	51,893

	Customer relationships and other intangibles	21,770			(1		)	21,769

	Other assets	53			4			57

	Current liabilities	(5,277		)	(22		)	(5,299		)
	Other liabilities	(5,133		)	(79		)	(5,212		)
	Total identifiable net assets	83,584			11			83,595

	Goodwill (ii)	23,956			1,308			25,264

	Total	$	107,540		$	1,319		$	108,859

	______________________

	(i)	The fair value of the financial assets acquired included customer receivables with an aggregate fair value of $13.2 million. Combined gross amounts due were $13.5 million.

	(ii)	Goodwill, which is attributed to expected operating and cross selling synergies, has been assigned to the Industrial and Field Services segment and will not be deductible for tax purposes.
Unaudited pro forma combined summary data	'
	The following unaudited pro forma combined financial data presents information as if the three other 2012 acquisitions had been acquired as of January 1, 2011 and assumes that there were no material, non-recurring pro forma adjustments directly attributable to those acquisitions. The pro forma financial information does not necessarily reflect the actual results that would have been reported had the Company and those three other acquisitions been combined during the periods presented, nor is it necessarily indicative of the future results of operations of the combined companies (in thousands).


		2012			2011
	Pro forma combined revenues	$	2,268,621		$	2,112,297

	Pro forma combined net income	$	130,322		$	126,768

Peak Energy Services Ltd.'s ('Peak')	'
Business Acquisition [Line Items]	'
Summary of recognized amounts of identifiable assets acquired and liabilities assumed	'
	In 2012, the Company finalized the purchase accounting for the acquisition of Peak. The following table summarizes the amounts of assets acquired and liabilities assumed at June 10, 2011 (in thousands).


		Final Allocations
	Current assets(i)	$	45,222

	Property, plant and equipment	151,574

	Identifiable intangible assets	12,337

	Other assets	8,009

	Current liabilities	(28,785		)
	Asset retirement obligations	(103		)
	Other liabilities	(11,341		)
	Total identifiable net assets	176,913

	Goodwill(ii)	28,220

	Total	$	205,133

	____________

	(i)	The fair value of the financial assets acquired included customer receivables with a fair value of $33.3 million. The gross amount due was $34.7 million.

	(ii)	Goodwill, which is attributable to expected operating and cross-selling synergies, will not be deductible for tax purposes. Goodwill of $12.9 million and $15.3 million has been recorded in the Oil and Gas Field Services and Industrial and Field Services segments, respectively.
2011 Acquisitions	'
Business Acquisition [Line Items]	'
Summary of recognized amounts of identifiable assets acquired and liabilities assumed	'
	In 2012, the Company finalized the purchase accounting for the three other 2011 acquisitions. The following table summarizes the recognized amounts of assets acquired and liabilities assumed (in thousands).


		Final Allocations
	Current assets (i)	$	41,551

	Property, plant and equipment	62,969

	Customer relationships and other intangibles	23,371

	Other assets	1,671

	Current liabilities	(23,148		)
	Asset retirement obligations	(200		)
	Other liabilities	(2,419		)
	Total identifiable net assets	103,795

	Goodwill (ii)	38,339

	Total	$	142,134

	_______________________

	(i)	The fair value of the financial assets acquired included customer receivables with an aggregate fair value of $21.4 million. Combined gross amounts due were $22.1 million.

	(ii)	Goodwill of $13.3 million, $11.1 million and $13.9 million has been assigned to the Oil and Gas Field Services, Technical Services and the Industrial and Field Services segments, respectively, and will not be deductible for tax purposes.

INVENTORIES_AND_SUPPLIES_Table

INVENTORIES AND SUPPLIES (Tables)	12 Months Ended
	Dec. 31, 2013
Inventory Disclosure [Abstract]	'
Schedule of Inventory	'
	Inventories and supplies consisted of the following (in thousands):


		December 31, 2013		31-Dec-12
				(As Adjusted)
	Oil and oil products	$	59,639	$	76,791

	Supplies and drums	64,471		69,521

	Solvent and solutions	10,100		9,398

	Other	17,886		20,768

	Total inventories and supplies	$	152,096	$	176,478

PROPERTY_PLANT_AND_EQUIPMENT_T

PROPERTY, PLANT, AND EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Property, Plant and Equipment	'
	The Company depreciates and amortizes the cost of these assets, using the straight-line method as follows:


	Asset Classification		Estimated Useful Life
	Buildings and building improvements
	Buildings		30–40 years

	Leasehold and building improvements		2–40 years
	Camp equipment		12–15 years
	Vehicles		3–12 years
	Equipment
	Capitalized software and computer equipment		3–5 years
	Solar equipment		20 years
	Containers and railcars		15–20 years
	All other equipment		8–20 years
	Furniture and fixtures		5–8 years
	Property, plant and equipment consisted of the following (in thousands):


		December 31, 2013		31-Dec-12
				(As Adjusted)
	Land	$	99,794	$	104,379

	Asset retirement costs (non-landfill)	10,938		10,111

	Landfill assets	100,983		77,952

	Buildings and improvements	327,956		359,816

	Camp equipment	187,831		135,827

	Vehicles	425,296		385,172

	Equipment	1,201,296		1,034,856

	Furniture and fixtures	5,260		3,735

	Construction in progress	58,010		34,124

		2,417,364		2,145,972

	Less - accumulated depreciation and amortization	815,194		612,919

	Total property, plant and equipment, net	$	1,602,170	$	1,533,053

GOODWILL_AND_OTHER_INTANGIBLE_1

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	12 Months Ended
GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of changes to goodwill	'
	The changes to goodwill for the years ended December 31, 2013 and 2012 were as follows (in thousands):


		2013			2012
		2013			(As Adjusted)
	Balance at January 1	$	579,715		$	122,392
	Balance at January 1	$	579,715		$	122,392
	Acquired from acquisitions	—			450,525
	Acquired from acquisitions	—			450,525
	Increase from adjustments related to the acquisitions during the measurement period	1,308			5,037
		1,308			5,037
	Foreign currency translation	(10,063		)	1,761
	Foreign currency translation	(10,063		)	1,761
	Balance at December 31	$	570,960		$	579,715
	Balance at December 31	$	570,960		$	579,715
Schedule of Finite-Lived Intangible Assets by Major Class	'
	As of December 31, 2013 and 2012, the Company's finite-lived and indefinite lived intangible assets consisted of the following (in thousands):


		December 31, 2013								31-Dec-12
		December 31, 2013								(As Adjusted)
		Cost			Accumulated		Net		Weighted	Cost		Accumulated		Net		Weighted
					Amortization				Average			Amortization				Average
									Amortization							Amortization
									Period							Period
									(in years)							(in years)
	Permits	$	157,327		$	50,858	$	106,469	19.6	$	149,361	$	46,282	$	103,079	21.8
	Permits	$	157,327		$	50,858	$	106,469	19.6	$	149,361	$	46,282	$	103,079	21.8
	Customer and supplier relationships	377,899			52,814		325,085		12.1	377,702		27,740		349,962		12.9
	Customer and supplier relationships	377,899			52,814		325,085		12.1	377,702		27,740		349,962		12.9
	Other intangible	29,299			15,518		13,781		3.3	23,604		12,121		11,483		3
	assets	29,299			15,518		13,781		3.3	23,604		12,121		11,483		3
	Total amortizable permits and other intangible assets	564,525			119,190		445,335		12.2	550,667		86,143		464,524		13.2
	Total amortizable permits and other intangible assets	564,525			119,190		445,335		12.2	550,667		86,143		464,524		13.2
	Trademarks and trade	124,638			—		124,638		Indefinite	125,520		—		125,520		Indefinite
	names	124,638			—		124,638		Indefinite	125,520		—		125,520		Indefinite
	Total permits and other intangible assets	$	689,163		$	119,190	$	569,973		$	676,187	$	86,143	$	590,044
	Total permits and other intangible assets	$	689,163		$	119,190	$	569,973		$	676,187	$	86,143	$	590,044
Schedule of finite-lived intangible assets related to acquisition	'
	As of December 31, 2013, the Company's finite-lived intangible assets related to its acquisition of Evergreen consisted of the following (in thousands):


		December 31, 2013
		Cost			Weighted Average Amortization Period (in years)
	Permits	$	10,000		25
	Permits	$	10,000		25
	Supplier relationships	6,500			7
	Supplier relationships	6,500			7
	Other intangible assets	600			12
	Other intangible assets	600			12
	Total amortizable permits and other intangible assets	$	17,100		12.4
	Total amortizable permits and other intangible assets	$	17,100		12.4
Schedule of expected amortization for the net carrying amount of finite lived intangible assets	'
	The expected amortization of the net carrying amount of finite-lived intangible assets at December 31, 2013 (in thousands):


	Years Ending December 31,	Expected
	Years Ending December 31,	Amortization
	2014	$	35,871
	2014	$	35,871
	2015	34,922
	2015	34,922
	2016	34,146
	2016	34,146
	2017	32,658
	2017	32,658
	2018	30,367
	2018	30,367
	Thereafter	277,371
	Thereafter	277,371
		$	445,335
		$	445,335

ACCRUED_EXPENSES_Tables

ACCRUED EXPENSES (Tables)	12 Months Ended
	Dec. 31, 2013
Payables and Accruals [Abstract]	'
Accrued expenses	'
	Accrued expenses consisted of the following at December 31 (in thousands):


		December 31, 2013		31-Dec-12
				(As Adjusted)
	Insurance	$	57,993	$	48,245

	Interest	20,731		20,061

	Accrued compensation and benefits	60,902		68,311

	Income, real estate, sales and other taxes	38,938		37,570

	Other	58,265		72,167

		$	236,829	$	246,354

CLOSURE_AND_POSTCLOSURE_LIABIL1

CLOSURE AND POST-CLOSURE LIABILITIES (Tables)	12 Months Ended
	Dec. 31, 2013
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") from January 1, 2012 through December 31, 2013 were as follows (in thousands):


		Landfill			Non-Landfill			Total
		Retirement			Retirement
		Liability			Liability
	Balance at January 1, 2012	$	25,764		$	9,117		$	34,881

	Liabilities assumed in Safety-Kleen acquisition	—			7,553			7,553

	New asset retirement obligations	3,257			—			3,257

	Accretion	2,897			1,096			3,993

	Changes in estimates recorded to statement of income	133			1,061			1,194

	Changes in estimates recorded to balance sheet	(3,086		)	15			(3,071		)

	Expenditures	(2,382		)	(1,463		)	(3,845		)
	Currency translation and other	75			10			85

	Balance at December 31, 2012 (As Adjusted)	26,658			17,389			44,047

	Liabilities assumed in Evergreen acquisition	—			659			659

	New asset retirement obligations	4,515			—			4,515

	Accretion	3,016			1,730			4,746

	Changes in estimates recorded to statement of income	(409		)	47			(362		)

	Changes in estimates recorded to balance sheet	(1,697		)	181			(1,516		)

	Expenditures	(4,175		)	(347		)	(4,522		)
	Currency translation and other	(304		)	(178		)	(482		)
	Balance at December 31, 2013	$	27,604		$	19,481		$	47,085

Schedule of Expected Payments Related to Asset Retirement Obligations	'
	Anticipated payments (based on current estimated costs and anticipated timing of necessary regulatory approvals to commence work on closure and post-closure activities) for each of the next five years and thereafter are as follows (in thousands):


	Year ending December 31,
	2014	$	7,017

	2015	8,607

	2016	6,860

	2017	4,526

	2018	8,164

	Thereafter	259,837

	Undiscounted closure and post-closure liabilities	295,011

	Less: Discount at credit-adjusted risk-free rate	(160,091		)
	Less: Undiscounted estimated closure and post-closure liabilities relating to airspace not yet consumed	(87,835		)
	Present value of closure and post-closure liabilities	$	47,085

REMEDIAL_LIABILITIES_Tables

REMEDIAL LIABILITIES (Tables)	12 Months Ended
	Dec. 31, 2013
Environmental Remediation Obligations [Abstract]	'
Changes to remedial liabilities	'
	The changes to remedial liabilities from January 1, 2012 through December 31, 2013 were as follows (in thousands):


		Remedial				Remedial				Remedial			Total
		Liabilities for				Liabilities for				Liabilities
		Landfill Sites				Inactive Sites				(Including
										Superfund) for
										Non-Landfill
										Operations
	Balance at January 1, 2012	$	5,600			$	78,449			$	51,271		$	135,320

	Liabilities assumed in Safety-Kleen acquisition	—				10,485				48,188			58,673

	Accretion	276				3,456				2,192			5,924

	Changes in estimates recorded to statement of income	(31		)		(5,978		)		(3,643		)	(9,652		)
	Expenditures	(82		)		(4,851		)		(2,413		)	(7,346		)
	Currency translation and other	66				3				358			427

	Balance at December 31, 2012 (As Adjusted)	5,829				81,564				95,953			183,346

	Liabilities assumed in Evergreen acquisition	—				—				2,384			2,384

	Accretion	281				3,302				3,212			6,795

	Changes in estimates recorded to statement of income	(190		)		(2,813		)		(317		)	(3,320		)
	Expenditures	(93		)		(7,599		)		(7,202		)	(14,894		)
	Currency translation and other	(203		)		(192		)		(1,418		)	(1,813		)
	Balance at December 31, 2013	$	5,624			$	74,262			$	92,612		$	172,498

Remedial Liabilities Anticipated Payments for Each of the Next Five Years	'
	Anticipated payments at December 31, 2013 (based on current estimated costs and anticipated timing of necessary regulatory approvals to commence work on remedial activities) for each of the next five years and thereafter are as follows (in thousands):


	Year ending December 31,
	2014	$	24,095

	2015	19,095

	2016	14,305

	2017	10,950

	2018	13,416

	Thereafter	125,003

	Undiscounted remedial liabilities	206,864

	Less: Discount	(34,366		)
	Total remedial liabilities	$	172,498

Environmental Exit Costs by Cost	'
	The following tables show, respectively, (i) the amounts of such estimated liabilities associated with the types of facilities and sites involved and (ii) the amounts of such estimated liabilities associated with each facility or site which represents at least 5% of the total and with all other facilities and sites as a group.
	Estimates Based on Type of Facility or Site (in thousands):


	Type of Facility or Site	Remedial				% of Total			Reasonably Possible
		Liability							Additional Liabilities(1)
	Facilities now used in active conduct of the Company's business (67 facilities)	$	83,122			48.2	%		$	10,795

	Inactive facilities not now used in active conduct of the Company's business but most of which were acquired because the assumption of remedial liabilities for such facilities was part of the purchase price for the CSD assets (40 facilities)	74,227				43			11,385

	Superfund sites owned by third parties (30 sites)	15,149				8.8			1,515

	Total	$	172,498			100	%		$	23,695

	___________________________________

	-1	Amounts represent the high end of the range of management's best estimate of the reasonably possible additional liabilities.
	Estimates Based on Amount of Potential Liability (in thousands):


	Location	Type of Facility or Site		Remedial				% of Total			Reasonably
				Liability							Possible
											Additional
											Liabilities(1)
	Baton Rouge, LA(2)	Closed incinerator and landfill		$	29,369			17	%		$	4,443

	Bridgeport, NJ	Closed incinerator		19,521				11.3			2,599

	Mercier, Quebec(2)	Idled incinerator and legal proceedings		13,970				8.1			1,520

	Various(2)	All other incinerators, landfills, wastewater treatment facilities and service centers (104 facilities)		94,489				54.8			13,618

	Various(2)	Superfund sites (each representing less than 5% of total liabilities) owned by third parties (30 sites)		15,149				8.8			1,515

	Total			$	172,498			100	%		$	23,695

	_________________________________

	-1	Amounts represent the high end of the range of management's best estimate of the reasonably possible additional liabilities.

	-2	$34.6 million of the $172.5 million remedial liabilities and $3.5 million of the $23.7 million reasonably possible additional liabilities include estimates of remediation liabilities related to the legal and administrative proceedings discussed in Note 16, "Commitments and Contingencies," as well as other such estimated remedial liabilities.

FINANCING_ARRANGEMENTS_Tables

FINANCING ARRANGEMENTS (Tables)	12 Months Ended
	Dec. 31, 2013
Financing arrangements	'
Summary of the entity's financial arrangements	'
	The following table is a summary of the Company's financing arrangements (in thousands):


		December 31, 2013			December 31, 2012
	Senior unsecured notes, at 5.25%, due August 1, 2020	$	800,000		$	800,000

	Senior unsecured notes, at 5.125%, due June 1, 2021	600,000			600,000

	Long-term obligations	$	1,400,000		$	1,400,000

Unsecured Senior Notes 2020	'
Financing arrangements	'
Schedule of redemption prices expressed as percentages of the principal amount	'
	The Company may redeem some or all of the 2020 Notes at any time on or after August 1, 2016 upon proper notice, at the following redemption prices plus unpaid interest:


	Year		Percentage
	2016		102.625	%
	2017		101.313	%
	2018 and thereafter		100	%
Unsecured Senior Notes 2021	'
Financing arrangements	'
Schedule of redemption prices expressed as percentages of the principal amount	'
	The Company may redeem some or all of the 2021 Notes at the following redemption prices (expressed as percentages of the principal amount) if redeemed.


	Year		Percentage
	2016		102.563	%
	2017		101.281	%
	2018 and thereafter		100	%

INCOME_TAXES_Tables

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Schedule of Income before Income Tax, Domestic and Foreign	'
	The domestic and foreign components of income before provision for income taxes were as follows (in thousands):


		For the Year Ended December 31,
		2013			2012			2011
	Domestic	$	85,775		$	90,240		$	128,201

	Foreign	58,110			37,490			56,477

	Total	$	143,885		$	127,730		$	184,678

Schedule of Components of Income Tax Expense (Benefit)	'
	The provision (benefit) for income taxes consisted of the following (in thousands):


		For the Year Ended December 31,
		2013			2012			2011
	Current:
	Federal (i)	$	5,264		$	(29,401	)	$	16,285

	State	5,006			(10,736		)	6,002

	Foreign	6,930			4,030			(2,697		)

		17,200			(36,107		)	19,590

	Deferred
	Federal	20,574			23,521			22,455

	State	2,074			2,865			2,710

	Foreign	8,471			7,777			12,671

		31,119			34,163			37,836

	Net provision (benefit) for income taxes	$	48,319		$	(1,944	)	$	57,426

	_____________________

	(i)	The 2012 benefit includes a decrease in unrecognized tax benefits of $52.4 million (net of interest and penalties of $29.3 million) resulting from expiring statute of limitation periods related to an historical Canadian debt restructuring transaction.
Schedule of Effective Income Tax Rate Reconciliation	'
	The effective income tax rate varied from the amount computed using the statutory federal income tax rate as follows (in thousands):


		For the Year Ended December 31,
		2013			2012			2011
	Tax expense at US statutory rate	$	50,360		$	44,705		$	64,637

	State income taxes, net of federal benefit	4,052			3,526			5,788

	Foreign rate differential	(10,478		)	(8,607		)	(10,229		)
	Non-deductible transaction costs	657			2,229			416

	Uncertain tax position releases	(4,010		)	(52,424		)	(6,156		)
	Uncertain tax position interest and penalties	457			1,658			2,240

	Other	7,281			6,969			730

	Net provision (benefit) for income taxes	$	48,319		$	(1,944	)	$	57,426

Schedule of Deferred Tax Assets and Liabilities	'
	The components of the total net deferred tax assets and liabilities at December 31, 2013 and 2012 were as follows (in thousands):


		2013			2012
					(As Adjusted)
	Deferred tax assets:
	Workers compensation accrual	$	11,825		$	10,772

	Provision for doubtful accounts	7,370			5,913

	Closure, post-closure and remedial liabilities	53,302			54,941

	Accrued expenses	19,671			19,198

	Accrued compensation	5,681			2,506

	Net operating loss carryforwards(1)	77,700			95,366

	Tax credit carryforwards(2)	29,985			31,932

	Uncertain tax positions accrued interest and federal benefit	1,949			2,200

	Stock-based compensation	1,159			844

	Other	2,170			2,570

	Total deferred tax assets	210,812			226,242

	Deferred tax liabilities:
	Property, plant and equipment	(225,271		)	(215,581		)
	Permits and other intangible assets	(159,223		)	(160,531		)
	Total deferred tax liabilities	(384,494		)	(376,112		)
	Total net deferred tax liability before valuation allowance	(173,682		)	(149,870		)
	Less valuation allowance	(29,726		)	(26,325		)
	Net deferred tax liabilities	$	(203,408	)	$	(176,195	)
	___________________________________

	-1	As of December 31, 2013, the net operating loss carryforwards included (i) state net operating loss carryovers of $219.0 million which will begin to expire in 2014, (ii) federal net operating loss carryforwards of $163.0 million which will begin to expire in 2025, and (iii) foreign net operating loss carryforwards of $49.0 million which will begin to expire in 2014.

	-2	As of December 31, 2013, the foreign tax credit carryforwards of $30.0 million will expire between 2014 and 2023.
Summary of Income Tax Contingencies	'
	The changes to unrecognized tax benefits (excluding related penalties and interest) from January 1, 2011 through December 31, 2013, were as follows (in thousands):


		2013			2012			2011			Description
	Unrecognized tax benefits as of January 1	$	3,543		$	36,217		$	39,709

	Gross adjustments in tax positions	210			—			(302		)	Additional Canadian liabilities

	Gross increases due to current year acquisitions	—			2,652			376			Additional U.S. and Canadian liabilities

	Settlements	—			—			(75		)	Required payments

	Expiration of statute of limitations	(2,843		)	(35,328		)	(3,436		)	U.S. and Canadian
	Foreign currency translation	394			2			(55		)	Currency translation adjustment

	Unrecognized tax benefits as of December 31	$	1,304		$	3,543		$	36,217

EARNINGS_PER_SHARE_Tables

EARNINGS PER SHARE (Tables)	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Reconciliation of basic and diluted earnings per share computations	'
	The following are computations of basic and diluted earnings per share (in thousands except for per share amounts):


		Years Ended December 31,
		2013		2012		2011
	Numerator for basic and diluted earnings per share:
	Net income	$	95,566	$	129,674	$	127,252

	Denominator:
	Basic shares outstanding	60,574		53,884		52,961

	Dilutive effect of equity-based compensation awards	154		195		363

	Dilutive shares outstanding	60,728		54,079		53,324



	Basic earnings per share	$	1.58	$	2.41	$	2.4

	Diluted earnings per share	$	1.57	$	2.4	$	2.39

ACCUMULATED_OTHER_COMPREHENSIV1

ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Tables)	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Schedule of Comprehensive Income (Loss)	'
	The changes in accumulated other comprehensive (loss) income by component and related tax effects for the years ended December 31, 2013, 2012 and 2011 were as follows (in thousands):


		Foreign Currency Translation Adjustments			Unrealized Gains (Losses) on Available-for-Sale Securities			Unfunded Pension Liability			Total
	Balance at January 1, 2011	$	50,966		$	459		$	(666	)	$	50,759

	Other comprehensive (loss) income before reclassifications	(18,264		)	860			(393		)	(17,797		)

	Amounts reclassified out of accumulated other comprehensive income	—			(1,872		)	—			(1,872		)

	Tax effects	—			205			58			263

	Other comprehensive loss	(18,264		)	(807		)	(335		)	(19,406		)
	Balance at December 31, 2011	$	32,702		$	(348	)	$	(1,001	)	$	31,353

	Other comprehensive income (loss) before reclassifications	17,925			1,185			(885		)	18,225

	Tax effects	—			(177		)	231			54

	Other comprehensive income (loss)	17,925			1,008			(654		)	18,279

	Balance at December 31, 2012	$	50,627		$	660		$	(1,655	)	$	49,632

	Other comprehensive (loss) income before reclassifications	(70,791		)	1,452			482			(68,857		)

	Tax effects	—			(208		)	(123		)	(331		)

	Other comprehensive (loss) income	(70,791		)	1,244			359			(69,188		)

	Balance at December 31, 2013	$	(20,164	)	$	1,904		$	(1,296	)	$	(19,556	)

Schedule of Accumulated Other Comprehensive Income (Loss)	'
	The amounts reclassified out of accumulated other comprehensive (loss) income into the consolidated statement of income, with presentation location, during the year ended December 31, 2011 were as follows (in thousands):


	Comprehensive (Loss) Income Components	December 31, 2011			Location
	Unrealized holding gains on available-for-sale investments	$	1,872		Other income (expense)

STOCKBASED_COMPENSATION_Tables

STOCK-BASED COMPENSATION (Tables)	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Schedule of Share-based Compensation, Stock Options, Activity	'
	The following table summarizes activity under the Plans relating to stock options:


	Stock Options	Number of		Weighted Average		Weighted Average	Aggregate
		Shares		Exercise Price		Remaining	Intrinsic Value
						Contractual Term	as of 12/31/13
						(in years)	(in thousands)
	Outstanding at January 1, 2013	97,200		$	15.1	1.96	$	3,880

	Exercised	(61,200	)	6.49

	Outstanding, exercisable and vested at December 31, 2013	36,000		$	29.73	4.04	$	1,088

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity	'
	The following table summarizes information about restricted stock awards for the year ended December 31, 2013:


	Restricted Stock	Number of		Weighted Average
		Shares		Grant-Date
				Fair Value
	Unvested at January 1, 2013	352,827		$	50.1

	Granted	297,123		55.35

	Vested	(72,661	)	44.57

	Forfeited	(74,707	)	53.69

	Unvested at December 31, 2013	502,582		$	53.47

Schedule of Nonvested Performance-based Units Activity	'
	The following table summarizes information about performance stock awards for the year ended December 31, 2013:


	Performance Stock	Number of		Weighted Average
		Shares		Grant-Date
				Fair Value
	Unvested at January 1, 2013	65,336		$	66.96

	Granted	114,453		54.27

	Forfeited	(69,928	)	66.12

	Unvested at December 31, 2013	109,861		$	54.27

COMMITMENTS_AND_CONTINGENCIES_

COMMITMENTS AND CONTINGENCIES (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of Future Minimum Lease Payments for Capital Leases and Operating Leases	'
	The following is a summary of future minimum payments under capital and operating leases that have initial or remaining noncancelable lease terms in excess of one year at December 31, 2013 (in thousands):


	Year	Total		Total
		Capital		Operating
		Leases		Leases
	2014	$	1,472	$	46,222

	2015	1,458		35,875

	2016	—		27,891

	2017	—		20,433

	2018	—		14,571

	Thereafter	—		30,606

	Total minimum lease payments	2,930		$	175,598

	Less: imputed interest at interest rates ranging from 4.0% to 16.0%	166

	Present value of future minimum lease payments	2,764

	Less: current portion of capital lease obligations	1,329

	Long-term capital lease obligations	$	1,435

Self-Insurance Liabilities Anticipated Payments	'
	Anticipated payments at December 31, 2013 for each of the next five years and thereafter are as follows (in thousands):


	Years ending December 31,
	2014	$	12,581

	2015	7,549

	2016	5,820

	2017	2,618

	2018	2,183

	Thereafter	2,862

	Undiscounted self-insurance liabilities	33,613

	Less: Discount	469

	Total self-insurance liabilities (included in accrued expenses)	$	33,144

SEGMENT_REPORTING_Tables

SEGMENT REPORTING (Tables)	12 Months Ended
SEGMENT REPORTING (Tables)	Dec. 31, 2013
Segment Reporting [Abstract]	'
Reconciliation of third party revenues to direct revenues	'
	The following table reconciles third party revenues to direct revenues for the years ended December 31, 2013, 2012 and 2011 (in thousands). Third party revenue is revenue billed to outside customers by a particular segment. Direct revenue is the revenue allocated to the segment performing the provided service. The Company analyzes results of operations based on direct revenues because the Company believes that these revenues and related expenses best reflect the manner in which operations are managed. 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 revenues from other segments.


		For the Year Ended December 31, 2013
		Technical			Oil Re-refining and Recycling			SK Environmental Services			Industrial			Oil and Gas Field			Corporate			Totals
		Services			Oil Re-refining and Recycling			SK Environmental Services			and Field Services			Services			Items			Totals
	Third party revenues	$	1,023,926		$	583,567		$	610,076		$	908,556		$	392,472		$	(8,941	)	$	3,509,656
	Third party revenues	$	1,023,926		$	583,567		$	610,076		$	908,556		$	392,472		$	(8,941	)	$	3,509,656
	Intersegment revenues, net	120,382			(246,586		)	160,585			(41,751		)	7,370			—			—
	Intersegment revenues, net	120,382			(246,586		)	160,585			(41,751		)	7,370			—			—
	Corporate Items, net	3,507			—			84			174			(342		)	(3,423		)	—
	Corporate Items, net	3,507			—			84			174			(342		)	(3,423		)	—
	Direct revenues	$	1,147,815		$	336,981		$	770,745		$	866,979		$	399,500		$	(12,364	)	$	3,509,656
	Direct revenues	$	1,147,815		$	336,981		$	770,745		$	866,979		$	399,500		$	(12,364	)	$	3,509,656


		For the Year Ended December 31, 2012
		Technical			Oil Re-refining and Recycling			SK Environmental Services			Industrial			Oil and Gas Field			Corporate			Totals
		Services			Oil Re-refining and Recycling			SK Environmental Services			and Field Services			Services			Items			Totals
	Third party revenues	$	957,764		$	—		$	—		$	828,119		$	400,549		$	1,476		$	2,187,908
	Third party revenues	$	957,764		$	—		$	—		$	828,119		$	400,549		$	1,476		$	2,187,908
	Intersegment revenues, net	31,637			—			—			(40,930		)	9,293			—			—
	Intersegment revenues, net	31,637			—			—			(40,930		)	9,293			—			—
	Corporate Items, net	2,295			—			—			64			(489		)	(1,870		)	—
	Corporate Items, net	2,295			—			—			64			(489		)	(1,870		)	—
	Direct revenues	$	991,696		$	—		$	—		$	787,253		$	409,353		$	(394	)	$	2,187,908
	Direct revenues	$	991,696		$	—		$	—		$	787,253		$	409,353		$	(394	)	$	2,187,908


		For the Year Ended December 31, 2011
		Technical			Oil Re-refining and Recycling			SK Environmental Services			Industrial			Oil and Gas Field			Corporate			Totals
		Services			Oil Re-refining and Recycling			SK Environmental Services			and Field Services (1)			Services			Items			Totals
	Third party revenues	$	910,896		$	—		$	—		$	731,626		$	340,563		$	1,051		$	1,984,136
	Third party revenues	$	910,896		$	—		$	—		$	731,626		$	340,563		$	1,051		$	1,984,136
	Intersegment revenues, net	32,340			—			—			(35,370		)	3,030			—			—
	Intersegment revenues, net	32,340			—			—			(35,370		)	3,030			—			—
	Corporate Items, net	2,505			—			—			(363		)	(401		)	(1,741		)	—
	Corporate Items, net	2,505			—			—			(363		)	(401		)	(1,741		)	—
	Direct revenues	$	945,741		$	—		$	—		$	695,893		$	343,192		$	(690	)	$	1,984,136
	Direct revenues	$	945,741		$	—		$	—		$	695,893		$	343,192		$	(690	)	$	1,984,136
	_______________________________________

	-1	During the year ended December 31, 2011, third party revenues for the Industrial and Field Services segment included revenues of $43.6 million associated with the oil spill response efforts in Montana.
Reconciliation to consolidated statements of income to adjusted EBITDA	'
	The following table presents information used by management by reported segment (in thousands). The Company does not allocate interest expense, income taxes, depreciation, amortization, accretion of environmental liabilities, other (income) expense, and loss on early extinguishment of debt to segments.


		For the Year Ended December 31,
		2013			2012			2011
	Adjusted EBITDA:
	Technical Services	$	285,520		$	249,829		$	240,494
	Technical Services	$	285,520		$	249,829		$	240,494
	Oil Re-refining and Recycling	57,314			—			—
	Oil Re-refining and Recycling	57,314			—			—
	SK Environmental Services	112,413			—			—
	SK Environmental Services	112,413			—			—
	Industrial and Field Services	176,952			158,931			136,380
	Industrial and Field Services	176,952			158,931			136,380
	Oil and Gas Field Services	68,063			77,048			77,870
	Oil and Gas Field Services	68,063			77,048			77,870
	Corporate Items	(190,157		)	(112,041		)	(104,736		)
	Total	510,105			373,767			350,008
	Total	510,105			373,767			350,008
	Reconciliation to Consolidated Statements of Income:
	Pre-tax, non-cash acquisition accounting inventory adjustment	13,559			—			—
		13,559			—			—
	Accretion of environmental liabilities	11,541			9,917			9,680
	Accretion of environmental liabilities	11,541			9,917			9,680
	Depreciation and amortization	264,449			161,646			122,663
	Depreciation and amortization	264,449			161,646			122,663
	Income from operations	220,556			202,204			217,665
	Income from operations	220,556			202,204			217,665
	Other (income) expense	(1,705		)	802			(6,402		)
	Other (income) expense	(1,705		)	802			(6,402		)
	Loss on early extinguishment of debt	—			26,385			—
	Loss on early extinguishment of debt	—			26,385			—
	Interest expense, net of interest income	78,376			47,287			39,389
	Interest expense, net of interest income	78,376			47,287			39,389
	Income from operations before provision (benefit) for income taxes	$	143,885		$	127,730		$	184,678
		$	143,885		$	127,730		$	184,678
PP&E and intangible assets by segment	'
	The following table presents assets by reported segment and in the aggregate (in thousands).


		December 31, 2013			31-Dec-12
		December 31, 2013			(As Adjusted)
	Property, plant and equipment, net
	Technical Services	$	400,544		$	405,447
	Technical Services	$	400,544		$	405,447
	Oil Re-refining and Recycling	211,513			178,210
	Oil Re-refining and Recycling	211,513			178,210
	SK Environmental Services	239,596			239,993
	SK Environmental Services	239,596			239,993
	Industrial and Field Services	405,327			371,386
	Industrial and Field Services	405,327			371,386
	Oil and Gas Field Services	237,335			257,985
	Oil and Gas Field Services	237,335			257,985
	Corporate Items	107,855			80,032
	Corporate Items	107,855			80,032
	Total property, plant and equipment, net	$	1,602,170		$	1,533,053
	Total property, plant and equipment, net	$	1,602,170		$	1,533,053
	Intangible assets:
	Technical Services
	Goodwill	$	45,599		$	45,991
	Goodwill	$	45,599		$	45,991
	Permits and other intangibles, net	80,302			86,403
	Permits and other intangibles, net	80,302			86,403
	Total Technical Services	125,901			132,394
	Total Technical Services	125,901			132,394
	Oil Re-refining and Recycling
	Goodwill	171,161			173,158
	Goodwill	171,161			173,158
	Permits and other intangibles, net	160,807			151,840
	Permits and other intangibles, net	160,807			151,840
	Total Oil Re-refining and Recycling Services	331,968			324,998
	Total Oil Re-refining and Recycling Services	331,968			324,998
	SK Environmental Services
	Goodwill	172,308			174,089
	Goodwill	172,308			174,089
	Permits and other intangibles, net	265,104			277,460
	Permits and other intangibles, net	265,104			277,460
	Total SK Environmental Services	437,412			451,549
	Total SK Environmental Services	437,412			451,549
	Industrial and Field Services
	Goodwill	144,385			146,715
	Goodwill	144,385			146,715
	Permits and other intangibles, net	35,332			41,163
	Permits and other intangibles, net	35,332			41,163
	Total Industrial and Field Services	179,717			187,878
	Total Industrial and Field Services	179,717			187,878
	Oil and Gas Field Services
	Goodwill	37,507			39,762
	Goodwill	37,507			39,762
	Permits and other intangibles, net	28,428			33,178
	Permits and other intangibles, net	28,428			33,178
	Total Oil and Gas Field Services	65,935			72,940
	Total Oil and Gas Field Services	65,935			72,940
	Total	$	1,140,933		$	1,169,759
	Total	$	1,140,933		$	1,169,759
Total assets by segment	'
	The following table presents the total assets by reported segment (in thousands).


		December 31, 2013			31-Dec-12
		December 31, 2013			(As Adjusted)
	Technical Services	$	699,675		$	716,309
	Technical Services	$	699,675		$	716,309
	Oil Re-Recycling and Refining	643,256			636,745
	Oil Re-Recycling and Refining	643,256			636,745
	SK Environmental Services	774,401			815,446
	SK Environmental Services	774,401			815,446
	Industrial and Field Services	634,541			612,664
	Industrial and Field Services	634,541			612,664
	Oil and Gas Field Services	395,805			348,771
	Oil and Gas Field Services	395,805			348,771
	Corporate Items	806,000			708,151
	Corporate Items	806,000			708,151
	Total	$	3,953,678		$	3,838,086
	Total	$	3,953,678		$	3,838,086
Total assets by geographical area	'
	The following table presents the total assets by geographical area (in thousands).


		December 31, 2013			31-Dec-12
		December 31, 2013			(As Adjusted)
	United States	$	2,684,686		$	2,555,926
	United States	$	2,684,686		$	2,555,926
	Canada	1,266,505			1,281,384
	Canada	1,266,505			1,281,384
	Other foreign	2,487			776
	Other foreign	2,487			776
	Total	$	3,953,678		$	3,838,086
	Total	$	3,953,678		$	3,838,086

GUARANTOR_AND_NONGUARANTOR_SUB1

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES (Tables)	12 Months Ended
	Dec. 31, 2013
Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract]	'
Schedule of condensed consolidating balance sheet	'
	Following is the condensed consolidating balance sheet at December 31, 2013 (in thousands):


		Clean				U.S. Guarantor				Foreign				Consolidating				Total
		Harbors, Inc.				Subsidiaries				Non-Guarantor				Adjustments
										Subsidiaries
	Assets:
	Cash and cash equivalents	$	1,006			$	235,445			$	73,622			$	—			$	310,073

	Intercompany receivables	269,580				2,448				230,224				(502,252		)		—

	Accounts receivable, net	—				387,006				192,388				—				579,394

	Other current assets	24,087				182,881				74,744				—				281,712

	Property, plant and equipment, net	—				945,280				656,890				—				1,602,170

	Investments in subsidiaries	2,683,158				967,186				144,953				(3,795,297		)		—

	Intercompany debt receivable	—				493,402				3,701				(497,103		)		—

	Goodwill	—				415,541				155,419				—				570,960

	Permits and other intangibles, net	—				458,917				111,056				—				569,973

	Other long-term assets	23,770				7,018				8,608				—				39,396

	Total assets	$	3,001,601			$	4,095,124			$	1,651,605			$	(4,794,652	)		$	3,953,678

	Liabilities and Stockholders' Equity:
	Current liabilities	$	33,626			$	466,454			$	139,465			$	—			$	639,545

	Intercompany payables	—				499,749				2,503				(502,252		)		—

	Closure, post-closure and remedial liabilities, net	—				158,298				31,814				—				190,112

	Long-term obligations	1,400,000				—				—				—				1,400,000

	Capital lease obligations, net	—				191				1,244				—				1,435

	Intercompany debt payable	3,701				—				493,402				(497,103		)		—

	Other long-term liabilities	88,635				103,125				55,187				—				246,947

	Total liabilities	1,525,962				1,227,817				723,615				(999,355		)		2,478,039

	Stockholders' equity	1,475,639				2,867,307				927,990				(3,795,297		)		1,475,639

	Total liabilities and stockholders' equity	$	3,001,601			$	4,095,124			$	1,651,605			$	(4,794,652	)		$	3,953,678

	Following is the condensed consolidating balance sheet at December 31, 2012 as adjusted (in thousands):


		Clean				U.S. Guarantor				Foreign				Consolidating				Total
		Harbors, Inc.				Subsidiaries				Non-Guarantor				Adjustments
										Subsidiaries
	Assets:
	Cash and cash equivalents	$	35,214			$	140,683			$	53,939			$	—			$	229,836

	Intercompany receivables	296,023				17,704				116,571				(430,298		)		—

	Accounts receivable, net	—				345,891				200,245				—				546,136

Other current assets	38,295				186,640				94,352				—				319,287

Property, plant and equipment, net	—				881,975				651,078				—				1,533,053

Investments in subsidiaries	2,528,699				850,011				144,953				(3,523,663		)		—

Intercompany debt receivable	—				508,067				3,701				(511,768		)		—

Goodwill	—				413,362				166,353				—				579,715

Permits and other intangibles, net	—				464,455				125,589				—				590,044

Other long-term assets	21,141				9,125				9,749				—				40,015

Total assets	$	2,919,372			$	3,817,913			$	1,566,530			$	(4,465,729	)		$	3,838,086

Liabilities and Stockholders' Equity:
Current liabilities	$	32,586			$	417,429			$	138,651			$	—			$	588,666

Intercompany payables	—				412,594				17,704				(430,298		)		—

Closure, post-closure and remedial liabilities, net	—				164,506				34,551				—				199,057

Long-term obligations	1,400,000				—				—				—				1,400,000

Capital lease obligations, net	—				301				2,578				—				2,879

Intercompany debt payable	3,701				—				508,067				(511,768		)		—

Other long-term liabilities	51,013				108,694				55,705				—				215,412

Total liabilities	1,487,300				1,103,524				757,256				(942,066		)		2,406,014

Stockholders' equity	1,432,072				2,714,389				809,274				(3,523,663		)		1,432,072

Total liabilities and stockholders' equity	$	2,919,372			$	3,817,913			$	1,566,530			$	(4,465,729	)		$	3,838,086

Schedule of consolidating statement of income	'
	Following is the consolidating statement of income for the year ended December 31, 2013 (in thousands):


		Clean				U.S. Guarantor				Foreign				Consolidating				Total
		Harbors, Inc.				Subsidiaries				Non-Guarantor				Adjustments
										Subsidiaries
	Revenues
	Service revenues	$	—			$	1,754,356			$	989,620			$	(14,771	)		$	2,729,205

	Product revenues	—				611,548				173,127				(4,224		)		780,451

	Total revenues	—				2,365,904				1,162,747				(18,995		)		3,509,656

	Cost of revenues (exclusive of items shown separately below)
	Service cost of revenues	—				1,187,946				701,273				(14,771		)		1,874,448

	Product cost of revenues	—				524,318				148,091				(4,224		)		668,185

	Total cost of revenues	—				1,712,264				849,364				(18,995		)		2,542,633

	Selling, general and administrative expenses	109				352,387				117,981				—				470,477

	Accretion of environmental liabilities	—				9,817				1,724				—				11,541

	Depreciation and amortization	—				169,629				94,820				—				264,449

	Income from operations	(109		)		121,807				98,858				—				220,556

	Other income (expense)	—				3,211				(1,506		)		—				1,705

	Interest (expense) income, net	(79,017		)		224				417				—				(78,376		)

	Equity in earnings of subsidiaries	184,498				79,427				—				(263,925		)		—

	Intercompany dividend income (expense)	—				—				13,292				(13,292		)		—

	Intercompany interest income (expense)	—				40,304				(40,304		)		—				—

	Income (loss) before provision for income taxes	105,372				244,973				70,757				(277,217		)		143,885

	Provision for income taxes	9,806				23,113				15,400				—				48,319

	Net income (loss)	95,566				221,860				55,357				(277,217		)		95,566

	Other comprehensive (loss) income	(69,188		)		(69,188		)		39,519				29,669				(69,188		)

	Comprehensive income (loss)	$	26,378			$	152,672			$	94,876			$	(247,548	)		$	26,378














	Following is the consolidating statement of income for the year ended December 31, 2012 (in thousands):


	Clean				U.S. Guarantor				Foreign				Consolidating				Total
	Harbors, Inc.				Subsidiaries				Non-Guarantor				Adjustments
									Subsidiaries
Revenues
Service revenues	—				1,155,993				927,240				(20,073		)		2,063,160

Product revenues	—				87,460				38,500				(1,212		)		124,748

Total revenues	—				1,243,453				965,740				(21,285		)		2,187,908

Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—				787,228				672,439				(20,073		)		1,439,594

Product cost of revenues	—				70,085				32,154				(1,212		)		101,027

Total cost of revenues	—				857,313				704,593				(21,285		)		1,540,621

Selling, general and administrative expenses	66				173,190				100,264				—				273,520

Accretion of environmental liabilities	—				8,592				1,325				—				9,917

Depreciation and amortization	—				80,154				81,492				—				161,646

Income from operations	(66		)		124,204				78,066				—				202,204

Other income	—				(154		)		(648		)		—				(802		)

Loss on early extinguishment of debt	(26,385		)		—				—				—				(26,385		)

Interest (expense), net	(46,221		)		—				(1,066		)		—				(47,287		)

Equity in earnings of subsidiaries	187,432				65,452				—				(252,884		)		—

Intercompany dividend income (expense)	10,010				—				13,805				(23,815		)		—

Intercompany interest income (expense)	—				41,636				(41,636		)		—				—

Income before provision for income taxes	124,770				231,138				48,521				(276,699		)		127,730

(Benefit) provision for income taxes	(4,904		)		(8,852		)		11,812				—				(1,944		)

Net income	129,674				239,990				36,709				(276,699		)		129,674

Other comprehensive income (loss)	18,279				18,279				7,986				(26,265		)		18,279

Comprehensive income (loss)	$	147,953			$	258,269			$	44,695			$	(302,964	)		$	147,953













Following is the consolidating statement of income for the year ended December 31, 2011 (in thousands):


	Clean				U.S. Guarantor				Foreign				Consolidating				Total
	Harbors, Inc.				Subsidiaries				Non-Guarantor				Adjustments
									Subsidiaries
Revenues
Service revenues	—				1,055,095				854,306				(26,422		)		1,882,979

Product revenues	—				86,840				15,737				(1,420		)		101,157

Total revenues	—				1,141,935				870,043				(27,842		)		1,984,136

Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—				720,189				607,596				(26,422		)		1,301,363

Product cost of revenues	—				66,582				13,466				(1,420		)		78,628

Total cost of revenues	—				786,771				621,062				(27,842		)		1,379,991

Selling, general and administrative expenses	100				165,882				88,155				—				254,137

Accretion of environmental liabilities	—				8,442				1,238				—				9,680

Depreciation and amortization	—				58,328				64,335				—				122,663

Income from operations	(100		)		122,512				95,253				—				217,665

Other income	—				3,864				2,538				—				6,402

Interest (expense) income, net	(38,755		)		18				(652		)		—				(39,389		)

Equity in earnings of subsidiaries	174,029				84,789				—				(258,818		)		—

Intercompany dividend income (expense)	10,186				—				13,832				(24,018		)		—

Intercompany interest income (expense)	—				37,870				(37,870		)		—				—

Income from continuing operations before provision for income taxes	145,360				249,053				73,101				(282,836		)		184,678

Provision for income taxes	18,108				29,341				9,977				—				57,426

Net income	127,252				219,712				63,124				(282,836		)		127,252

Other comprehensive income (loss)	(19,406		)		(19,406		)		(8,381		)		27,787				(19,406		)

Comprehensive income (loss)	$	107,846			$	200,306			$	54,743			$	(255,049	)		$	107,846

Schedule of condensed consolidating statement of cash flows	'
	Following is the condensed consolidating statement of cash flows for the year ended December 31, 2013 (in thousands):


		Clean				U.S. Guarantor				Foreign				Total
		Harbors, Inc.				Subsidiaries				Non-Guarantor
										Subsidiaries
	Net cash from operating activities	$	(33,932	)		$	264,491			$	185,280			$	415,839

	Cash flows from investing activities:
	Additions to property, plant and equipment	—				(145,395		)		(134,812		)		(280,207		)

	Proceeds from sales of fixed assets	—				1,078				3,621				4,699

	Acquisitions, net of cash acquired	(6,025		)		(57,239		)		—				(63,264		)

	Additions to intangible assets including costs to obtain or renew permits	—				(5,247		)		(1,493		)		(6,740		)

	Net cash used in investing activities	(6,025		)		(206,803		)		(132,684		)		(345,512		)
	Cash flows from financing activities:
	Change in uncashed checks	—				9,922				2,346				12,268

	Proceeds from exercise of stock options	400				—				—				400

	Remittance of shares, net	(731		)		—				—				(731		)

	Excess tax benefit of stock-based compensation	1,409				—				—				1,409

	Deferred financing costs paid	(2,504		)		—				—				(2,504		)

	Proceeds from employee stock purchase plan	7,425				—				—				7,425

	Payments on capital leases	—				(227		)		(4,664		)		(4,891		)

	Issuance costs related to issuances of common stock	(250		)		—				—				(250		)

	Dividends (paid)/received	—				(13,545		)		13,545				—

	Interest (payments) / received	—				40,924				(40,924		)		—

	Net cash from financing activities	5,749				37,074				(29,697		)		13,126

	Effect of exchange rate change on cash	—				—				(3,216		)		(3,216		)

	(Decrease) increase in cash and cash equivalents	(34,208		)		94,762				19,683				80,237

	Cash and cash equivalents, beginning of year	35,214				140,683				53,939				229,836

	Cash and cash equivalents, end of year	$	1,006			$	235,445			$	73,622			$	310,073

	Following is the condensed consolidating statement of cash flows for the year ended December 31, 2012 (in thousands):


		Clean				U.S. Guarantor				Foreign				Total
		Harbors, Inc.				Subsidiaries				Non-Guarantor
										Subsidiaries
	Net cash from operating activities	$	(45,655	)		$	179,425			$	190,595			$	324,365

	Cash flows from investing activities:
	Additions to property, plant and equipment	—				(117,344		)		(80,053		)		(197,397		)

	Proceeds from sales of fixed assets	—				3,810				4,315				8,125

	Acquisitions, net of cash acquired	(1,257,259		)		(63,351		)		(53,311		)		(1,373,921		)
Additions to intangible assets including costs to obtain or renew permits	—				(712		)		(3,334		)		(4,046		)

Purchase of marketable securities	—				—				(10,517		)		(10,517		)

Other	—				500				4,620				5,120

Net cash used in investing activities	(1,257,259		)		(177,097		)		(138,280		)		(1,572,636		)
Cash flows from financing activities:
Change in uncashed checks	—				(6,761		)		(5,309		)		(12,070		)

Proceeds from exercise of stock options	288				—				—				288

Remittance of shares, net	(2,912		)		—				—				(2,912		)

Excess tax benefit of stock-based compensation	2,556				—				—				2,556

Deferred financing costs paid	(19,056		)		—				—				(19,056		)

Proceeds from employee stock purchase plan	6,196				—				—				6,196

Payments of capital leases	—				(850		)		(5,749		)		(6,599		)

Proceeds from issuance of common stock, net	369,520				—				—				369,520

Principle payment on debt	(520,000		)		—				—				(520,000		)

Distribution of cash earned on employee participation plan	(55		)		—				—				(55		)

Issuance of senior unsecured notes, at par	1,400,000				—				—				1,400,000

Dividends (paid) / received	10,010				(23,815		)		13,805				—

Interest (payments) / received	—				41,710				(41,710		)		—

Net cash from financing activities	1,246,547				10,284				(38,963		)		1,217,868

Effect of exchange rate change on cash	—				—				(484		)		(484		)

(Decrease) increase in cash and cash equivalents	(56,367		)		12,612				12,868				(30,887		)

Cash and cash equivalents, beginning of year	91,581				128,071				41,071				260,723

Cash and cash equivalents, end of year	$	35,214			$	140,683			$	53,939			$	229,836

Following is the condensed consolidating statement of cash flows for the year ended December 31, 2011 (in thousands):


	Clean				U.S. Guarantor				Foreign				Total
	Harbors, Inc.				Subsidiaries				Non-Guarantor
									Subsidiaries
Net cash from operating activities	$	(17,428	)		$	90,015			$	106,944			$	179,531

Cash flows from investing activities:
Additions to property, plant and equipment	—				(92,531		)		(55,982		)		(148,513		)

Proceeds from sales of fixed assets and assets held for sale	—				657				6,137				6,794

Acquisitions, net of cash acquired	—				(50,166		)		(286,794		)		(336,960		)

Additions to intangible assets including costs to obtain or renew permits	—				(465		)		(2,462		)		(2,927		)

Proceeds from sales of marketable securities	—				—				425				425

Proceeds from sale of long-term investments	—				1,000				—				1,000

Investment in subsidiaries	(258,597		)		178,884				79,713				—

Net cash used in investing activities	(258,597		)		37,379				(258,963		)		(480,181		)

Cash flows from financing activities:
Change in uncashed checks	—				6,558				3,264				9,822

Proceeds from exercise of stock options	1,350				—				—				1,350

Remittance of shares, net	(4,061		)		—				—				(4,061		)

Excess tax benefit of stock-based compensation	3,352				—				—				3,352

Deferred financing costs paid	(8,463		)		—				—				(8,463		)

Proceeds from employee stock purchase plan	3,516				—				—				3,516

Payments of capital leases	—				(820		)		(7,017		)		(7,837		)

Distribution of cash earned on employee participation plan	—				—				(189		)		(189		)

Issuance of senior secured notes, including premium	261,250				—				—				261,250

Dividends received / (paid)	10,186				(24,306		)		14,120				—

Interest received / (payments)	—				35,088				(35,088		)		—

Intercompany debt	—				(140,425		)		140,425				—

Net cash from financing activities	267,130				(123,905		)		115,515				258,740

Effect of exchange rate change on cash	—				—				423				423

(Decrease) increase in cash and cash equivalents	(8,895		)		3,489				(36,081		)		(41,487		)

Cash and cash equivalents, beginning of year	100,476				124,582				77,152				302,210

Cash and cash equivalents, end of year	$	91,581			$	128,071			$	41,071			$	260,723

QUARTERLY_DATA_UNAUDITED_Table

QUARTERLY DATA (UNAUDITED) (Tables)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
QUARTERLY DATA (UNAUDITED)	'


		First			Second			Third			Fourth
		Quarter			Quarter			Quarter			Quarter
		(in thousands except per share amounts)
	2013
	Revenues	$	862,163		$	860,528		$	907,535		$	879,430

	Cost of revenues (2)	636,024			614,326			647,119			645,164

	Gross profit	226,139			246,202			260,416			234,266

	Income from operations	34,828			53,243			73,608			58,877

	Other income (expense)	525			1,655			(150		)	(325		)

	Net income	10,502			22,902			35,361			26,801

	Basic earnings per share	0.17			0.38			0.58			0.44

	Diluted earnings per share	0.17			0.38			0.58			0.44



		First			Second			Third			Fourth
		Quarter			Quarter			Quarter (1)			Quarter (1)
		(in thousands except per share amounts)
	2012
	Revenues	$	572,022		$	523,118		$	533,806		$	558,962

	Cost of revenues (2)	400,315			367,623			372,940			399,743

	Gross profit	171,707			155,495			160,866			159,219

	Income from operations	61,701			47,533			56,739			36,231

	Other expense	(299		)	(75		)	(91		)	(337		)
	Net income	32,015			23,426			12,359			61,874

	Basic earnings per share	0.6			0.44			0.23			1.11

	Diluted earnings per share	0.6			0.44			0.23			1.11

	______________________________________

	-1	The third quarter 2012 net income and earnings per share were impacted by a $26.4 million loss on early extinguishment of debt in connection with a redemption and repurchase of the Company's $520.0 million previously outstanding senior secured notes. The fourth quarter 2012 net income and earnings per share were impacted by a decrease in unrecognized tax benefits of $52.4 million resulting from expiring statute of limitation periods related to an historical Canadian debt restructuring transaction.

	-2	Items shown separately on the statements of income consist of (i) accretion of environmental liabilities and (ii) depreciation and amortization.

OPERATIONS_Details

OPERATIONS (Details)	Dec. 31, 2013	Dec. 28, 2012
OPERATIONS (Details)	Dec. 31, 2013	Safety-Kleen
Operations	'	'
Outstanding common shares acquired (as a percent)	100.00%	100.00%

SIGNIFICANT_ACCOUNTING_POLICIE3

SIGNIFICANT ACCOUNTING POLICIES SIGNIFICANT ACCOUNTING POLICIES CASH, CASH EQUIVALENTS AND UNCASHED CHECKS (Details) (USD $)	Dec. 31, 2013
Accounting Policies [Abstract]	'
Bank Disbursement Account Balance	$0

SIGNIFICANT_ACCOUNTING_POLICIE4

SIGNIFICANT ACCOUNTING POLICIES SIGNIFICANT ACCOUNTING POLICIES MARKETABLE SECURITIES (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]	'	'
Marketable securities	$12,435	$11,778

SIGNIFICANT_ACCOUNTING_POLICIE5

SIGNIFICANT ACCOUNTING POLICIES CREDIT CONCENTRATION (Details)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounts Receivable	'	'	'
Restricted Cash and Cash Equivalents Items [Line Items]	'	'	'
Concentration Risk Major Customers Over Benchmark	10.00%	10.00%	'
Sales	'	'	'
Restricted Cash and Cash Equivalents Items [Line Items]	'	'	'
Concentration Risk Major Customers Over Benchmark	10.00%	10.00%	10.00%

SIGNIFICANT_ACCOUNTING_POLICIE6

SIGNIFICANT ACCOUNTING POLICIES PROPERTY, PLANT AND EQUIPMENT (Details)	12 Months Ended
	Dec. 31, 2013
Solar equipment	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'20 years
Minimum \| Buildings	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'30 years
Minimum \| Leasehold and building improvements	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'2 years
Minimum \| Camp equipment	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'12 years
Minimum \| Vehicles	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'3 years
Minimum \| Capitalized software and computer equipment	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'3 years
Minimum \| Containers and railcars	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'15 years
Minimum \| All other equipment	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'8 years
Minimum \| Furniture and fixtures	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'5 years
Maximum \| Buildings	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'40 years
Maximum \| Leasehold and building improvements	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'40 years
Maximum \| Camp equipment	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'15 years
Maximum \| Vehicles	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'12 years
Maximum \| Capitalized software and computer equipment	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'5 years
Maximum \| Containers and railcars	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'20 years
Maximum \| All other equipment	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'20 years
Maximum \| Furniture and fixtures	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'8 years
Weighted Average \| Leasehold and building improvements	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'8 years 292 days

SIGNIFICANT_ACCOUNTING_POLICIE7

SIGNIFICANT ACCOUNTING POLICIES GOODWILL AND INTANGIBLE ASSETS (Details) (USD $)

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 28, 2012

Dec. 31, 2013

Dec. 31, 2012

reporting_unit

Minimum

Maximum

Oil Refining and Recycling

Oil and Gas Field Services

Technical Services, Field Services, Industrial Services and Lodging Reporting Units

Permits

Other intangible assets

Permits

Other intangible assets

Finite-Lived Intangible Assets [Line Items]

Number of Reporting Units

Percentage Fair Value Exceeded Carrying Value

10.00%

Goodwill

$570,960,000

$579,715,000

$122,392,000

$171,161,000

$173,158,000

$173,200,000

$37,507,000

$39,762,000

Finite-Lived Intangible Asset, Useful Life

'5 years

'3 years

'30 years

'20 years

Finite-Lived Intangible Assets, Amortization Expense

$35,100,000

$17,200,000

$12,400,000

SIGNIFICANT_ACCOUNTING_POLICIE8

SIGNIFICANT ACCOUNTING POLICIES LANDFILL ASSETS (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	CubicYards	CubicYards	CubicYards
	Landfill_Sites
	Expansions
	service_locations
Property, Plant and Equipment [Line Items]	'	'	'
Application Approvals	'5 years	'	'
Number of Expansions	2	'	'
Number of Service Locations	2	'	'
Percentage of Airspace Remaining	19.10%	'	'
Landfill Sites	11	'	'
Remaining Highly Probable Airspace	29,323,000	'	'
Permitted, But Not Highly Probable Airspace	0	0	'
Remaining Airspace Capacity [Roll Forward]	'	'	'
Remaining capacity, beginning of period	29,643,000	27,557,000	28,557,000
Addition of highly probable airspace, net	1,218,000	3,598,000	102,000
Consumed	-1,538,000	-1,512,000	-1,102,000
Remaining capacity, end of period	29,323,000	29,643,000	27,557,000
Landfill Final Closure and Post-Closure Liabilities	$27.60	$26.70	'
Regulatory Post-Closure Period for Landfill	'30 years	'	'
Inflation rate (as a percent)	1.02%	'	'
Non-landfill Closure and Post-Closure Liabilities	19.5	17.4	'
Permitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	23,735,000	'	'
Unpermitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	5,588,000	'	'
Landfill assets	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Amortization	$16.80	$17.30	10.4
Non-commercial landfills	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Landfill Sites	2	'	'
Minimum	'	'	'
Remaining Airspace Capacity [Roll Forward]	'	'	'
Non-landfill Closure and Post-Closure Liabilities (in years)	'10 years	'	'
Maximum	'	'	'
Remaining Airspace Capacity [Roll Forward]	'	'	'
Non-landfill Closure and Post-Closure Liabilities (in years)	'30 years	'	'
Altair \| Texas	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Lives (Years)	'12 years	'	'
Remaining Highly Probable Airspace	752,000	'	'
Altair \| Texas \| Permitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	752,000	'	'
Altair \| Texas \| Unpermitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	0	'	'
Buttonwillow \| California	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Lives (Years)	'27 years	'	'
Remaining Highly Probable Airspace	7,701,000	'	'
Buttonwillow \| California \| Permitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	7,701,000	'	'
Buttonwillow \| California \| Unpermitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	0	'	'
Deer Park \| Texas	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Lives (Years)	'9 years	'	'
Remaining Highly Probable Airspace	342,000	'	'
Deer Park \| Texas \| Permitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	342,000	'	'
Deer Park \| Texas \| Unpermitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	0	'	'
Deer Trail \| Colorado	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Lives (Years)	'41 years	'	'
Remaining Highly Probable Airspace	2,061,000	'	'
Deer Trail \| Colorado \| Permitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	2,061,000	'	'
Deer Trail \| Colorado \| Unpermitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	0	'	'
Grassy Mountain \| Utah	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Lives (Years)	'29 years	'	'
Remaining Highly Probable Airspace	2,058,000	'	'
Grassy Mountain \| Utah \| Permitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	2,058,000	'	'
Grassy Mountain \| Utah \| Unpermitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	0	'	'
Kimball \| Nebraska	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Lives (Years)	'10 years	'	'
Remaining Highly Probable Airspace	281,000	'	'
Kimball \| Nebraska \| Permitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	281,000	'	'
Kimball \| Nebraska \| Unpermitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	0	'	'
Lambton \| Ontario	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Lives (Years)	'49 years	'	'
Remaining Highly Probable Airspace	4,828,000	'	'
Lambton \| Ontario \| Permitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	120,000	'	'
Lambton \| Ontario \| Unpermitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	4,708,000	'	'
Lone Mountain \| Oklahoma	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Lives (Years)	'17 years	'	'
Remaining Highly Probable Airspace	2,769,000	'	'
Lone Mountain \| Oklahoma \| Permitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	2,769,000	'	'
Lone Mountain \| Oklahoma \| Unpermitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	0	'	'
Ryley \| Alberta	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Lives (Years)	'11 years	'	'
Remaining Highly Probable Airspace	1,792,000	'	'
Ryley \| Alberta \| Permitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	912,000	'	'
Ryley \| Alberta \| Unpermitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	880,000	'	'
Sawyer \| North Dakota	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Lives (Years)	'16 years	'	'
Remaining Highly Probable Airspace	4,007,000	'	'
Sawyer \| North Dakota \| Permitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	4,007,000	'	'
Sawyer \| North Dakota \| Unpermitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	0	'	'
Westmorland \| California	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Lives (Years)	'64 years	'	'
Remaining Highly Probable Airspace	2,732,000	'	'
Westmorland \| California \| Permitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	2,732,000	'	'
Westmorland \| California \| Unpermitted	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Remaining Highly Probable Airspace	0	'	'

SIGNIFICANT_ACCOUNTING_POLICIE9

SIGNIFICANT ACCOUNTING POLICIES REMEDIAL LIABILITIES (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	sites	Dec. 31, 2012	Dec. 31, 2011
Regulatory Liabilities [Line Items]	'	'	'
Accrual for Environmental Loss Contingencies	$172,498	$183,346	$135,320
Period of Time In Years Over Which Business Acquisitions Have Been Acquired	'12 years	'	'
Superfund sites owned by third parties	35	'	'
Superfund sites	123	'	'
Minimum	'	'	'
Regulatory Liabilities [Line Items]	'	'	'
Remedial Liabilities at Acquisition	1.01%	'	'
Remedial Liabilities Discounted Risk Free Interest Rate	2.88%	'	'
Maximum	'	'	'
Regulatory Liabilities [Line Items]	'	'	'
Remedial Liabilities at Acquisition	2.44%	'	'
Remedial Liabilities Discounted Risk Free Interest Rate	4.90%	'	'

Recovered_Sheet1

SIGNIFICANT ACCOUNTING POLICIES LETTERS OF CREDIT (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]	'	'
Letters of Credit Outstanding, Amount	$140.30	$132.60

Recovered_Sheet2

SIGNIFICANT ACCOUNTING POLICIES REVENUE RECOGNITION (Details)	12 Months Ended
	Dec. 31, 2013
	segment
Segment Reporting Information [Line Items]	'
Reporting segments number	5
Environmental Services \| Parts Cleaning Services \| Minimum	'
Segment Reporting Information [Line Items]	'
Service period	'49 days
Environmental Services \| Parts Cleaning Services \| Maximum	'
Segment Reporting Information [Line Items]	'
Service period	'98 days

Recovered_Sheet3

SIGNIFICANT ACCOUNTING POLICIES SIGNIFICANT ACCOUNTING POLICIES ADVERTISING EXPENSE (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]	'	'	'
Advertising Expense	$10.80	$5	$3.90

Recovered_Sheet4

SIGNIFICANT ACCOUNTING POLICIES BUSINESS COMBINATIONS (Details)	Dec. 31, 2013
Accounting Policies [Abstract]	'
Percentage of all assets and liabilities of all business combinations	100.00%

BUSINESS_COMBINATIONS_2013_Acq

BUSINESS COMBINATIONS 2013 Acquisitions (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Sep. 13, 2013	Sep. 13, 2013	Sep. 13, 2013
				Evergreen Oil, Inc.	Evergreen Oil, Inc.	Evergreen Oil, Inc.	Evergreen Oil, Inc.
						Preliminary Allocations	Measurement Period Adjustments
Business Acquisition [Line Items]	'	'	'	'	'	'	'
Outstanding common shares acquired (as a percent)	100.00%	'	'	'	100.00%	'	'
Business Acquisition, Cost of Acquired Entity, Transaction Costs	'	'	'	$400,000	'	'	'
Summary of recognized assets acquired and liabilities assumed	'	'	'	'	'	'	'
Inventories and supplies	'	'	'	'	1,089,000	1,206,000	-117,000
Prepaid and other current assets	'	'	'	'	1,291,000	873,000	418,000
Property, plant and equipment	'	'	'	'	40,563,000	40,563,000	0
Permits and other intangibles	'	'	'	'	17,100,000	16,500,000	600,000
Deferred tax assets, less current portion	'	'	'	'	2,368,000	0	2,368,000
Other assets	'	'	'	'	3,607,000	3,607,000	0
Current liabilities	'	'	'	'	-6,198,000	-6,108,000	-90,000
Closure and post-closure liabilities	'	'	'	'	-659,000	-659,000	0
Remedial liabilities, less current portion	'	'	'	'	-2,103,000	-2,103,000	0
Other long-term liabilities	'	'	'	'	-1,139,000	-1,139,000	0
Total identifiable net assets	'	'	'	'	55,919,000	52,740,000	3,179,000
Goodwill	570,960,000	579,715,000	122,392,000	'	0	3,179,000	-3,179,000
Total	'	'	'	'	$55,919,000	$55,919,000	$0

BUSINESS_COMBINATIONS_2012_Acq

BUSINESS COMBINATIONS 2012 Acquisitions (Details) (USD $)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 28, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 28, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 28, 2012

Jul. 30, 2012

Dec. 28, 2012

Dec. 03, 2012

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 28, 2012

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Oil Refining and Recycling

Environmental Services

Industrial and Field Services

Senior secured notes

Safety-Kleen

Other 2012 Acquisitions

Senior secured notes

Preliminary Allocations

Measurement Period Adjustments

aquisition

Preliminary Allocations

Measurement Period Adjustments

Unsecured Senior Notes 2021

Business Acquisition [Line Items]

Outstanding common shares acquired (as a percent)

100.00%

Cash paid for Peak common shares

$305,000,000

Issuance of acquisition-related common stock, net

369,300,000

Stock Issued During Period, Shares, Acquisitions

6,900,000

Proceeds from Issuance of Private Placement

589,000,000

Long-term Debt, Gross

600,000,000

Senior secured notes, interest rate (as a percent)

7.63%

5.13%

Business Acquisition, Cost of Acquired Entity, Transaction Costs

6,300,000

2,700,000

Summary of recognized assets acquired and liabilities assumed

Current assets

20,387,000

20,270,000

117,000

Inventories and supplies

107,376,000

102,339,000

5,037,000

Other current assets

155,674,000

152,245,000

3,429,000

Property, plant and equipment

516,002,000

514,712,000

1,290,000

51,893,000

51,901,000

-8,000

Permits and other intangibles

438,627,000

421,400,000

17,227,000

21,769,000

21,770,000

-1,000

Other assets

4,338,000

4,985,000

-647,000

57,000

53,000

4,000

Current liabilities

-206,241,000

-192,652,000

-13,589,000

-5,299,000

-5,277,000

-22,000

Closure and post-closure liabilities

-7,553,000

-15,774,000

8,221,000

Remedial liabilities, less current portion

-48,301,000

-38,370,000

-9,931,000

Other long-term liabilities

-119,331,000

-128,375,000

9,044,000

-5,212,000

-5,133,000

-79,000

Total identifiable net assets

840,591,000

820,510,000

20,081,000

83,595,000

83,584,000

11,000

Goodwill

570,960,000

579,715,000

122,392,000

171,161,000

173,158,000

173,200,000

172,308,000

174,089,000

174,100,000

144,385,000

146,715,000

75,400,000

422,693,000

436,749,000

-14,056,000

25,264,000

23,956,000

1,308,000

Total

1,263,284,000

1,257,259,000

6,025,000

108,900,000

108,859,000

107,540,000

1,319,000

Business Combination, Acquired Receivables, Fair Value

137,600,000

13,200,000

Customer receivables, gross amount due

142,700,000

13,500,000

Business Acquisition, Pro Forma Information

Pro forma combined revenues

3,529,592,000

3,245,637,000

2,268,621,000

2,112,297,000

Pro forma combined net income

125,425,000

129,242,000

130,322,000

126,768,000

Number of Businesses Acquired

Assumed debt

7,700,000

Post-closing adjustments

2,100,000

Acquisition related costs

$400,000

BUSINESS_COMBINATIONS_2011_Acq

BUSINESS COMBINATIONS 2011 Acquisitions (Details)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 28, 2012

Jun. 10, 2011

Dec. 31, 2011

Jun. 10, 2011

Dec. 31, 2011

Dec. 31, 2012

USD ($)

Oil and Gas Field Services

Technical Services

Industrial Services

Peak Energy Services Ltd.'s ('Peak')

2011 Acquisitions

USD ($)

CAD

Oil and Gas Field Services

Industrial Services

USD ($)

Oil and Gas Field Services

Technical Services

Industrial Services

USD ($)

Business Acquisition [Line Items]

Outstanding common shares acquired (as a percent)

100.00%

Percentage of outstanding common shares of acquiree already owned by company (as a percent)

3.15%

Total purchase price

$205,133,000

200,200,000

Exchange rate translation

0.976

Purchase price, cash assumed

162,600,000

Assumed debt

38,400,000

25,200,000

Fair value of common shares in acquiree

15,700,000

Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value

4,100,000

Gain loss recognized in other income previously held as common shares

1,900,000

Summary of recognized assets acquired and liabilities assumed

Current assets

45,222,000

41,551,000

Property, plant and equipment

151,574,000

62,969,000

Customer relationships and other intangibles

12,337,000

23,371,000

Other assets

8,009,000

1,671,000

Current liabilities

-28,785,000

-23,148,000

Asset retirement obligations

-103,000

-200,000

Other liabilities

-11,341,000

-2,419,000

Total identifiable net assets

176,913,000

103,795,000

Goodwill

570,960,000

579,715,000

122,392,000

37,507,000

39,762,000

45,599,000

45,991,000

144,385,000

146,715,000

75,400,000

28,220,000

12,900,000

15,300,000

38,339,000

13,300,000

11,100,000

13,900,000

Total

205,133,000

142,100,000

142,134,000

Business Combination, Acquired Receivables, Fair Value

33,300,000

21,400,000

Customer receivables, gross amount due

34,700,000

22,100,000

Post-closing adjustments

4,500,000

Acquisition related costs

$700,000

$800,000

INVENTORIES_AND_SUPPLIES_Detai

INVENTORIES AND SUPPLIES (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]	'	'
Oil and oil products	$59,639	$76,791
Supplies and drums	64,471	69,521
Solvent and solutions	10,100	9,398
Other	17,886	20,768
Total inventories and supplies	$152,096	$176,478

PROPERTY_PLANT_AND_EQUIPMENT_D

PROPERTY, PLANT, AND EQUIPMENT (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]	'	'
Property, Plant and Equipment, Gross	$2,417,364	$2,145,972
Less - accumulated depreciation and amortization	815,194	612,919
Total property, plant and equipment, net	1,602,170	1,533,053
Land	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, Plant and Equipment, Gross	99,794	104,379
Asset retirement costs (non-landfill)	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, Plant and Equipment, Gross	10,938	10,111
Landfill assets	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, Plant and Equipment, Gross	100,983	77,952
Buildings and improvements	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, Plant and Equipment, Gross	327,956	359,816
Camp equipment	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, Plant and Equipment, Gross	187,831	135,827
Vehicles	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, Plant and Equipment, Gross	425,296	385,172
Equipment	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, Plant and Equipment, Gross	1,201,296	1,034,856
Furniture and fixtures	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, Plant and Equipment, Gross	5,260	3,735
Construction in progress	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, Plant and Equipment, Gross	$58,010	$34,124

PROPERTY_PLANT_AND_EQUIPMENT_D1

PROPERTY, PLANT, AND EQUIPMENT (Details 2) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Abstract]	'	'	'
Interest Capitalization	$0.90	$0.20	$0.50
Depreciation and Amortization	$212.50	$127.20	$99.90

GOODWILL_AND_OTHER_INTANGIBLE_2

GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Changes to goodwill	'	'
Goodwill, beginning of period	$579,715	$122,392
Acquired from acquisitions	0	450,525
Increase from adjustments related to the acquisitions during the measurement period	1,308	5,037
Foreign currency translation	-10,063	1,761
Goodwill, end of period	$570,960	$579,715

GOODWILL_AND_OTHER_INTANGIBLE_3

GOODWILL AND OTHER INTANGIBLE ASSETS (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Finite-lived intangible assets	'	'
Accumulated Amortization	$119,190	$86,143
Net	569,973	590,044
Finite and Indefinite Lived Intangibles Gross	689,163	676,187
Weighted Average Amortization Period (in years)	'12 years 69 days	'13 years 84 days
Trademarks and trade names	'	'
Finite-lived intangible assets	'	'
Acquired Indefinite-lived Intangible Asset, Amount	124,638	125,520
Permits	'	'
Finite-lived intangible assets	'	'
Cost	157,327	149,361
Accumulated Amortization	50,858	46,282
Net	106,469	103,079
Weighted Average Amortization Period (in years)	'19 years 219 days	'21 years 9 months 18 days
Customer and supplier relationships	'	'
Finite-lived intangible assets	'	'
Cost	377,899	377,702
Accumulated Amortization	52,814	27,740
Net	325,085	349,962
Weighted Average Amortization Period (in years)	'12 years 22 days	'12 years 343 days
Other intangible assets	'	'
Finite-lived intangible assets	'	'
Cost	29,299	23,604
Accumulated Amortization	15,518	12,121
Net	13,781	11,483
Weighted Average Amortization Period (in years)	'3 years 110 days	'2 years 350 days
Total amortizable permits and other intangible assets	'	'
Finite-lived intangible assets	'	'
Cost	564,525	550,667
Accumulated Amortization	119,190	86,143
Net	$445,335	$464,524

GOODWILL_AND_OTHER_INTANGIBLE_4

GOODWILL AND OTHER INTANGIBLE ASSETS (Details 3) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Weighted Average Amortization Period (in years)	'12 years 69 days	'13 years 84 days
Permits	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Weighted Average Amortization Period (in years)	'19 years 219 days	'21 years 9 months 18 days
Supplier relationships	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Weighted Average Amortization Period (in years)	'12 years 22 days	'12 years 343 days
Other intangible assets	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Weighted Average Amortization Period (in years)	'3 years 110 days	'2 years 350 days
Evergreen Oil, Inc.	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Cost	17,100	'
Weighted Average Amortization Period (in years)	'12 years 146 days	'
Evergreen Oil, Inc. \| Permits	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Cost	10,000	'
Weighted Average Amortization Period (in years)	'25 years	'
Evergreen Oil, Inc. \| Supplier relationships	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Cost	6,500	'
Weighted Average Amortization Period (in years)	'7 years	'
Evergreen Oil, Inc. \| Other intangible assets	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Cost	600	'
Weighted Average Amortization Period (in years)	'12 years	'

GOODWILL_AND_OTHER_INTANGIBLE_5

GOODWILL AND OTHER INTANGIBLE ASSETS (Details 4) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2013
Expected amortization	'
2014	$35,871
2015	34,922
2016	34,146
2017	32,658
2018	30,367
Thereafter	277,371
Total	$445,335

ACCRUED_EXPENSES_Details

ACCRUED EXPENSES (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Payables and Accruals [Abstract]	'	'
Insurance	$57,993	$48,245
Interest	20,731	20,061
Accrued compensation and benefits	60,902	68,311
Income, real estate, sales and other taxes	38,938	37,570
Other	58,265	72,167
Total accrued expenses	$236,829	$246,354

CLOSURE_AND_POSTCLOSURE_LIABIL2

CLOSURE AND POST-CLOSURE LIABILITIES (Details) (USD $)	7 Months Ended	12 Months Ended		4 Months Ended	13 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 07, 2012	Dec. 31, 2013	Jul. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
				Senior Notes	Senior Notes	Senior Notes	Landfill Retirement Liability	Landfill Retirement Liability	Non-Landfill Retirement Liability	Non-Landfill Retirement Liability
				Unsecured Senior Notes 2020	Unsecured Senior Notes 2020	Unsecured Senior Notes 2020
Changes to post-closure liabilities	'	'	'	'	'	'	'	'	'	'
Balance at the beginning of the period	$34,881	$44,047	$34,881	'	'	'	$26,658	$25,764	$17,389	$9,117
Liabilities assumed in Safety-Kleen acquisition	'	659	7,553	'	'	'	'	0	659	7,553
New asset retirement obligations	'	4,515	3,257	'	'	'	4,515	3,257	'	'
Accretion	'	4,746	3,993	'	'	'	3,016	2,897	1,730	1,096
Changes in estimates recorded to statement of income	'	-362	1,194	'	'	'	-409	133	47	1,061
Changes in estimates recorded to balance sheet	'	-1,516	-3,071	'	'	'	-1,697	-3,086	181	15
Expenditures	'	-4,522	-3,845	'	'	'	-4,175	-2,382	-347	-1,463
Currency translation and other	'	-482	85	'	'	'	-304	75	-178	10
Balance at the end of the period	'	47,085	44,047	'	'	'	27,604	26,658	19,481	17,389
Long-term Debt, Gross	'	'	'	600,000	'	800,000	'	'	'	'
Credit-adjusted risk-free rate (as a percent)	8.56%	'	'	'	'	'	'	'	'	'
Asset Retirement Obligations Discount Rate (as a percent)	'	'	'	6.66%	6.60%	'	'	'	'	'
Environmental Property Sale, Disposal or Abandonment Costs	'	'	'	'	'	'	'	'	'	'
2014	'	7,017	'	'	'	'	'	'	'	'
2015	'	8,607	'	'	'	'	'	'	'	'
2016	'	6,860	'	'	'	'	'	'	'	'
2017	'	4,526	'	'	'	'	'	'	'	'
2018	'	8,164	'	'	'	'	'	'	'	'
Thereafter	'	259,837	'	'	'	'	'	'	'	'
Undiscounted closure and post-closure liabilities	'	295,011	'	'	'	'	'	'	'	'
Less: Discount at credit-adjusted risk-free rate	'	-160,091	'	'	'	'	'	'	'	'
Less: Undiscounted estimated closure and post-closure liabilities relating to airspace not yet consumed	'	-87,835	'	'	'	'	'	'	'	'
Present value of closure and post-closure liabilities	'	$47,085	$44,047	'	'	'	$27,604	$26,658	$19,481	$17,389

REMEDIAL_LIABILITIES_Details

REMEDIAL LIABILITIES (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
	sites	sites
Changes to remedial liabilities	'	'
Balance at the beginning of the period	$183,346	$135,320
Liabilities assumed in Evergreen acquisition	2,384	58,673
Accretion	6,795	5,924
Changes in estimates recorded to statement of income	-3,320	-9,652
Expenditures	-14,894	-7,346
Currency translation and other	-1,813	427
Balance at the end of the period	172,498	183,346
Number of Sites	2	3
Accrual for Environmental Loss Contingencies, Net [Abstract]	'	'
2014	24,095	'
2015	19,095	'
2016	14,305	'
2017	10,950	'
2018	13,416	'
Thereafter	125,003	'
Undiscounted remedial liabilities	206,864	'
Less: Discount	-34,366	'
Total remedial liabilities	172,498	183,346
Possible Increase in Total Remedial Liabilities	23,695	'
Accrual for Environmental Loss Contingencies, Threshold For Disclosure	5.00%	'
% of Total	100.00%	'
Reasonably Possible Additional Liabilities(1)	23,695	'
Active Landfill Facilities	'	'
Changes to remedial liabilities	'	'
Balance at the end of the period	83,122	'
Accrual for Environmental Loss Contingencies, Net [Abstract]	'	'
Total remedial liabilities	83,122	'
% of Total	48.20%	'
Reasonably Possible Additional Liabilities(1)	10,795	'
Number Of Facility By Type	67	'
Inactive Landfill Facilities	'	'
Changes to remedial liabilities	'	'
Balance at the end of the period	74,227	'
Accrual for Environmental Loss Contingencies, Net [Abstract]	'	'
Total remedial liabilities	74,227	'
% of Total	43.00%	'
Reasonably Possible Additional Liabilities(1)	11,385	'
Number Of Facility By Type	40	'
Superfund Landfill Sites Owned By Third Parties	'	'
Changes to remedial liabilities	'	'
Balance at the end of the period	15,149	'
Accrual for Environmental Loss Contingencies, Net [Abstract]	'	'
Total remedial liabilities	15,149	'
% of Total	8.80%	'
Reasonably Possible Additional Liabilities(1)	1,515	'
Number Of Facility By Type	30	'
Baton Rouge La \| Closed incinerator and landfill	'	'
Changes to remedial liabilities	'	'
Balance at the end of the period	29,369	'
Accrual for Environmental Loss Contingencies, Net [Abstract]	'	'
Total remedial liabilities	29,369	'
% of Total	17.00%	'
Reasonably Possible Additional Liabilities(1)	4,443	'
Bridgeport, NJ \| Closed incinerator	'	'
Changes to remedial liabilities	'	'
Balance at the end of the period	19,521	'
Accrual for Environmental Loss Contingencies, Net [Abstract]	'	'
Total remedial liabilities	19,521	'
% of Total	11.30%	'
Reasonably Possible Additional Liabilities(1)	2,599	'
Mercier Quebec \| Idled incinerator and legal proceedings	'	'
Changes to remedial liabilities	'	'
Balance at the end of the period	13,970	'
Accrual for Environmental Loss Contingencies, Net [Abstract]	'	'
Total remedial liabilities	13,970	'
% of Total	8.10%	'
Reasonably Possible Additional Liabilities(1)	1,520	'
Various \| Superfund Landfill Sites Owned By Third Parties	'	'
Changes to remedial liabilities	'	'
Balance at the end of the period	15,149	'
Accrual for Environmental Loss Contingencies, Net [Abstract]	'	'
Total remedial liabilities	15,149	'
% of Total	8.80%	'
Reasonably Possible Additional Liabilities(1)	1,515	'
Number Of Facility By Type	30	'
Various \| All other incinerators, landfills, wastewater treatment facilities and service centers (104 facilities)	'	'
Changes to remedial liabilities	'	'
Balance at the end of the period	94,489	'
Accrual for Environmental Loss Contingencies, Net [Abstract]	'	'
Total remedial liabilities	94,489	'
% of Total	54.80%	'
Reasonably Possible Additional Liabilities(1)	13,618	'
Number Of Facility By Type	104	'
Legal and Administrative Proceedings	'	'
Changes to remedial liabilities	'	'
Balance at the end of the period	34,600	'
Accrual for Environmental Loss Contingencies, Net [Abstract]	'	'
Total remedial liabilities	34,600	'
Reasonably Possible Additional Liabilities(1)	3,500	'
Benefit Change In Estimates	'	'
Changes to remedial liabilities	'	'
Number of Sites	'	2
Remedial Liabilities for Landfill Sites	'	'
Changes to remedial liabilities	'	'
Balance at the beginning of the period	5,829	5,600
Liabilities assumed in Evergreen acquisition	0	0
Accretion	281	276
Changes in estimates recorded to statement of income	-190	-31
Expenditures	-93	-82
Currency translation and other	-203	66
Balance at the end of the period	5,624	5,829
Accrual for Environmental Loss Contingencies, Net [Abstract]	'	'
Total remedial liabilities	5,624	5,829
Remedial Liabilities for Inactive Sites	'	'
Changes to remedial liabilities	'	'
Balance at the beginning of the period	81,564	78,449
Liabilities assumed in Evergreen acquisition	0	10,485
Accretion	3,302	3,456
Changes in estimates recorded to statement of income	-2,813	-5,978
Expenditures	-7,599	-4,851
Currency translation and other	-192	3
Balance at the end of the period	74,262	81,564
Accrual for Environmental Loss Contingencies, Net [Abstract]	'	'
Total remedial liabilities	74,262	81,564
Remedial Liabilities (Including Superfund) for Non-Landfill Operations	'	'
Changes to remedial liabilities	'	'
Balance at the beginning of the period	95,953	51,271
Liabilities assumed in Evergreen acquisition	2,384	48,188
Accretion	3,212	2,192
Changes in estimates recorded to statement of income	-317	-3,643
Expenditures	-7,202	-2,413
Currency translation and other	-1,418	358
Balance at the end of the period	92,612	95,953
Accrual for Environmental Loss Contingencies, Net [Abstract]	'	'
Total remedial liabilities	$92,612	$95,953

FINANCING_ARRANGEMENTS_Details

FINANCING ARRANGEMENTS (Details) (USD $)

12 Months Ended

0 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Jan. 17, 2012

Dec. 31, 2013

Dec. 31, 2012

Jul. 30, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 07, 2012

Dec. 31, 2013

Dec. 31, 2012

Jul. 30, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 07, 2012

Jul. 30, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 28, 2012

Jul. 30, 2012

Jan. 17, 2013

Clean Harbors, Inc.

Canadian subsidiaries

LIBOR loans

Base rate loans

Senior unsecured notes

Senior secured notes

Revolving credit facility

Letters of credit

Previous revolving credit facility

Unsecured Senior Notes 2020

Unsecured Senior Notes 2021

Unsecured Senior Notes 2020

Unsecured Senior Notes 2021

Secured Senior Notes 2016

Clean Harbors, Inc.

Canadian subsidiaries

LIBOR loans

Base rate loans

Clean Harbors, Inc.

Canadian subsidiaries

LIBOR loans

Base rate loans

Redeemable Debt Redemption Rate of 107.625 Percent

Safety-Kleen

Financing arrangements

Long-term Debt, Gross

$800,000,000

$600,000,000

$800,000,000

$600,000,000

$520,000,000

Long-term obligations

1,400,000,000

Senior secured notes, interest rate (as a percent)

5.25%

5.13%

7.63%

5.13%

Long-term Debt, Fair Value

804,200,000

816,000,000

601,600,000

623,500,000

2016

102.63%

102.56%

2017

101.31%

101.28%

2018 and thereafter

100.00%

Long-term Debt Redemption With Net Proceeds from Equity offerings as Percentage of Principal Amount

35.00%

Percentage of redemption price to principle amount (as a percent)

105.25%

105.13%

Percentage Of Aggregate Principle Of Debt

65.00%

Long-term Debt Redemption, Price as Percentage of Principal Amount

100.00%

Revolving credit facility, maximum borrowing capacity

400,000,000

300,000,000

100,000,000

325,000,000

250,000,000

75,000,000

250,000,000

Variable interest rate, basis

'LIBOR

'BofA's base rate

Debt Instrument Basis Spread on Variable Rate Low End of Range

1.50%

0.75%

1.75%

0.50%

Applicable margin on variable interest rate basis, high end of range (as a percent)

2.00%

1.25%

2.25%

1.00%

Credit Available, Subject to Percentage of Accounts Receivable

85.00%

Credit Available, Subject to Percentage of Cash Deposited

100.00%

Line Of Credit Facility Borrowing Capacity

259,700,000

117,400,000

Letters of Credit Outstanding, Amount

$140,300,000

$132,600,000

INCOME_TAXES_PROVISION_FOR_TAX

INCOME TAXES PROVISION FOR TAX EXPENSE (Details) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Change in Tax Benefits
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]	'	'	'	'
Domestic	$85,775,000	$90,240,000	$128,201,000	'
Foreign	58,110,000	37,490,000	56,477,000	'
Income before provision (benefit) for income taxes	143,885,000	127,730,000	184,678,000	'
Current:	'	'	'	'
Federal (i)	5,264,000	-29,401,000	16,285,000	'
State	5,006,000	-10,736,000	6,002,000	'
Foreign	6,930,000	4,030,000	-2,697,000	'
Current Income Tax Expense (Benefit)	17,200,000	-36,107,000	19,590,000	'
Deferred	'	'	'	'
Federal	20,574,000	23,521,000	22,455,000	'
State	2,074,000	2,865,000	2,710,000	'
Foreign	8,471,000	7,777,000	12,671,000	'
Deferred income taxes	31,119,000	34,163,000	37,836,000	'
Net provision (benefit) for income taxes	48,319,000	-1,944,000	57,426,000	'
Income Tax Contingency [Line Items]	'	'	'	'
Unrecognized Tax Benefits, Period Increase (Decrease)	'	'	'	-52,400,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	200,000	1,400,000	'	29,300,000
The Company's effective tax rate (including taxes on income from discontinued operations) (as a percent)	33.60%	-1.50%	31.10%	'
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]	'	'	'	'
Tax expense at US statutory rate	50,360,000	44,705,000	64,637,000	'
State income taxes, net of federal benefit	4,052,000	3,526,000	5,788,000	'
Foreign rate differential	-10,478,000	-8,607,000	-10,229,000	'
Non-deductible transaction costs	657,000	2,229,000	416,000	'
Uncertain tax position releases	-4,010,000	-52,424,000	-6,156,000	'
Uncertain tax position interest and penalties	457,000	1,658,000	2,240,000	'
Other	7,281,000	6,969,000	730,000	'
Net provision (benefit) for income taxes	$48,319,000	($1,944,000)	$57,426,000	'

INCOME_TAXES_DEFERRED_TAX_ASSE

INCOME TAXES DEFERRED TAX ASSET AND LIABILITIES (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2013
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Restricted Stock	Foreign Country
Deferred tax assets:	'	'	'	'	'
Workers compensation accrual	$11,825,000	$10,772,000	'	'	'
Provision for doubtful accounts	7,370,000	5,913,000	'	'	'
Closure, post-closure and remedial liabilities	53,302,000	54,941,000	'	'	'
Accrued expenses	19,671,000	19,198,000	'	'	'
Accrued compensation	5,681,000	2,506,000	'	'	'
Net operating loss carryforwards(1)	77,700,000	95,366,000	'	'	'
Tax credit carryforwards(2)	29,985,000	31,932,000	'	'	'
Uncertain tax positions accrued interest and federal benefit	1,949,000	2,200,000	'	'	'
Stock-based compensation	1,159,000	844,000	'	'	'
Other	2,170,000	2,570,000	'	'	'
Total deferred tax assets	210,812,000	226,242,000	'	'	'
Deferred tax liabilities:	'	'	'	'	'
Property, plant and equipment	-225,271,000	-215,581,000	'	'	'
Permits and other intangible assets	-159,223,000	-160,531,000	'	'	'
Total deferred tax liabilities	-384,494,000	-376,112,000	'	'	'
Total net deferred tax liability before valuation allowance	-173,682,000	-149,870,000	'	'	'
Less valuation allowance	-29,726,000	-26,325,000	-11,500,000	'	'
Net deferred tax liabilities	-203,408,000	-176,195,000	'	'	'
State and local operating loss carryforwards	219,000,000	'	'	'	'
Domestic operating loss carryforwards	163,000,000	'	'	'	'
Operating loss carryforwards	'	'	'	'	49,000,000
Foreign tax credit carryforwards	29,985,000	'	'	'	'
Increase (decrease) tax benefit from stock options exercised	'	'	'	7,100,000	'
Income tax benefit related to stock option exercises	'	'	'	$1,400,000	'

INCOME_TAXES_Details

INCOME TAXES (Details) (USD $)	12 Months Ended
INCOME TAXES (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Contingency [Line Items]	'	'	'
Undistributed Earnings of Foreign Subsidiaries	$133,900,000	'	'
Valuation allowance	29,726,000	26,325,000	11,500,000
Valuation Allowance, Amount Foreign Tax Credits	13,400,000	17,600,000	10,200,000
Valuation Allowance, Amount State Net Operating Loss	7,000,000	1,400,000	1,100,000
Valuation Allowance, Amount Foreign Net Operating Loss	7,500,000	7,300,000	200,000
Valuation Allowance, Amount, Deferred Tax Assets of Subsidiary	1,800,000	'	'
Unrecognized tax benefits and related reserves including interest and penalties	1,500,000	4,900,000	'
Unrecognized tax benefits, interest	200,000	'	'
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	$300,000	$2,800,000	$3,400,000

INCOME_TAXES_UNRECOGNIZED_TAX_

INCOME TAXES UNRECOGNIZED TAX BENEFITS (Details) (USD $)	12 Months Ended				3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Expiring Of Statutes of Limitations [Member]	Change in Tax Benefits
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]	'	'	'	'	'
Unrecognized Tax Benefits as of January 1	$3,543,000	$36,217,000	$39,709,000	'	'
Gross adjustments in tax positions	210,000	0	-302,000	'	'
Gross increases due to current year acquisitions	0	2,652,000	376,000	'	'
Settlements	0	0	-75,000	'	'
Expiration of statute of limitations	-2,843,000	-35,328,000	-3,436,000	-100,000	'
Foreign currency translation	394,000	2,000	-55,000	'	'
Unrecognized Tax Benefits as of December 31	1,304,000	3,543,000	36,217,000	'	'
Unrecognized Tax Benefits, Period Increase (Decrease)	'	'	'	'	-52,400,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	200,000	1,400,000	'	'	29,300,000
Expiring Statute of Limitations Related to Historical Canadian Business Combination	'	52,100,000	'	'	'
Expiration of Various State Statute of Limitation	'	300,000	'	'	'
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	$300,000	$2,800,000	$3,400,000	'	'

EARNINGS_PER_SHARE_Details

EARNINGS PER SHARE (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Numerator for basic and diluted earnings per share:	'	'	'	'	'	'	'	'	'	'	'
Net income	$26,801	$35,361	$22,902	$10,502	$61,874	$12,359	$23,426	$32,015	$95,566	$129,674	$127,252
Denominator:	'	'	'	'	'	'	'	'	'	'	'
Basic shares outstanding	'	'	'	'	'	'	'	'	60,574	53,884	52,961
Dilutive effect of equity-based compensation awards	'	'	'	'	'	'	'	'	154	195	363
Dilutive shares outstanding	'	'	'	'	'	'	'	'	60,728	54,079	53,324
Basic earnings per share:	'	'	'	'	'	'	'	'	'	'	'
Basic earnings per share (in dollars per share)	'	'	'	'	'	'	'	'	$1.58	$2.41	$2.40
Diluted earnings per share:	'	'	'	'	'	'	'	'	'	'	'
Diluted earnings per share (in dollars per share)	'	'	'	'	'	'	'	'	$1.57	$2.40	$2.39

EARNINGS_PER_SHARE_ANTIDILUTIV

EARNINGS PER SHARE - ANTI-DILUTIVE SECURITIES (Details) (Performance Stock Awards)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Performance Stock Awards	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	109,861	65,336

STOCKHOLDERS_EQUITY_Details

STOCKHOLDERS' EQUITY (Details) (USD $)	0 Months Ended
STOCKHOLDERS' EQUITY (Details) (USD $)	Dec. 28, 2012	Dec. 03, 2012
Stock Issued During Period, Per Share Value, New Issues (in dollars per share)	'	$56
Safety-Kleen	'	'
Stock Issued During Period, Shares, Acquisitions	6,900,000	6,900,000
Stock Issued During Period, Value, Other	'	$900,000
Issuance of acquisition-related common stock, net	$369,300,000	$369,300,000

ACCUMULATED_OTHER_COMPREHENSIV2

ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Increase (Decrease) in Equity	'	'	'
Beginning Balance	$49,632	$31,353	$50,759
Other comprehensive (loss) income before reclassifications	-68,857	18,225	-17,797
Amounts reclassified out of accumulated other comprehensive income	'	'	-1,872
Tax effects	-331	54	263
Other comprehensive income (loss)	-69,188	18,279	-19,406
Ending Balance	-19,556	49,632	31,353
Foreign Currency Translation Adjustments	'	'	'
Increase (Decrease) in Equity	'	'	'
Beginning Balance	50,627	32,702	50,966
Other comprehensive (loss) income before reclassifications	-70,791	17,925	-18,264
Amounts reclassified out of accumulated other comprehensive income	'	'	0
Tax effects	0	0	0
Other comprehensive income (loss)	-70,791	17,925	-18,264
Ending Balance	-20,164	50,627	32,702
Unrealized Gains (Losses) on Available-for-Sale Securities	'	'	'
Increase (Decrease) in Equity	'	'	'
Beginning Balance	660	-348	459
Other comprehensive (loss) income before reclassifications	1,452	1,185	860
Amounts reclassified out of accumulated other comprehensive income	'	'	-1,872
Tax effects	-208	-177	205
Other comprehensive income (loss)	1,244	1,008	-807
Ending Balance	1,904	660	-348
Unfunded Pension Liability	'	'	'
Increase (Decrease) in Equity	'	'	'
Beginning Balance	-1,655	-1,001	-666
Other comprehensive (loss) income before reclassifications	482	-885	-393
Amounts reclassified out of accumulated other comprehensive income	'	'	0
Tax effects	-123	231	58
Other comprehensive income (loss)	359	-654	-335
Ending Balance	($1,296)	($1,655)	($1,001)

ACCUMULATED_OTHER_COMPREHENSIV3

ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Other income (expense)	$1,872
Unrealized holding gains on available-for-sale investments	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Other income (expense)	$1,872

STOCKBASED_COMPENSATION_AND_EM1

STOCK-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS (Details) (USD $)	12 Months Ended					12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2010	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013
				2000 Equity Incentive Plan	2010 Equity Incentive Plan	Minimum	Minimum	Maximum	Maximum
							Restricted Stock		Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'	'	'	'	'
Options outstanding, number (in shares)	'	'	'	36,000	6,000,000	'	'	'	'
Share-based Compensation Arrangement by share-bases Payment Award, Award vesting Period	'	'	'	'	'	'5 years	'3 years	'10 years	'5 years
Allocated Share-based Compensation Expense	$9	$7.50	$8.20	'	'	'	'	'	'
Total income tax benefit from compensation cost	$3.20	$2.90	$2.40	'	'	'	'	'	'

STOCKBASED_COMPENSATION_AND_EM2

STOCK-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS - STOCK OPTION AWARDS (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected Forfeiture Rate Employees	7.00%	'	'
Expected Forfeiture Rate, Executives and Directors	4.00%	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]	'	'	'
Total Unrecognized Compensation Cost	$0	'	'
Stock Options, Total Intrinsic Value	2,500,000	2,300,000	2,100,000
Restricted Stock	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]	'	'	'
Stock Options, Weighted Average Exercise Price, Forfeited (in dollars per share)	$53.69	'	'
Total Unrecognized Compensation Cost	19,600,000	'	'
Performance Stock Awards	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected Forfeiture Rate Employees	7.00%	'	'
Expected Forfeiture Rate, Executives and Directors	4.00%	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]	'	'	'
Stock Options, Weighted Average Exercise Price, Forfeited (in dollars per share)	$66.12	'	'
Total Unrecognized Compensation Cost	0	'	'
Stock Options	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]	'	'	'
Number of Stock Options Outstanding, beginning of period (in shares)	97,200	'	'
Stock Options, Shares Exercised	-61,200	'	'
Number of Stock Options Outstanding and Vested, end of period (in shares)	36,000	97,200	'
Stock Options, Weighted Average Exercise Price, Outstanding beginning of period (in dollars per share)	$15.10	'	'
Stock Options, Weighted Average Exercise Price, Exercised (in dollars per share)	$6.49	'	'
Stock Options, Weighted Average Exercise Price, Outstanding and Vested end of period (in dollars per share)	$29.73	$15.10	'
Stock Options, Outstanding, Weighted Average Remaining Contractual Term (in years), beginning of period	'4 years 0 months 15 days	'1 year 11 months 16 days	'
Stock Options, Outstanding, Weighted Average Remaining Contractual Term (in years), end of period	'4 years 0 months 15 days	'1 year 11 months 16 days	'
Stock Options, Outstanding, Aggregate Intrinsic Value, beginning of period	3,880,000	'	'
Stock Options, Outstanding, Aggregate Intrinsic Value, end of period	$1,088,000	$3,880,000	'

STOCKBASED_COMPENSATION_AND_EM3

STOCK-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS - RESTRICTED STOCK AWARDS (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected Forfeiture Rate Employees	7.00%	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]	'	'	'
Total Unrecognized Compensation Cost	$0	'	'
Restricted Stock	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]	'	'	'
Number of Shares, Unvested at beginning of period	352,827	'	'
Number of Shares, Granted	297,123	'	'
Number of Shares, Vested	-72,661	'	'
Number of Shares, Forfeited	-74,707	'	'
Number of Shares, Unvested at end of period	502,582	352,827	'
Shares, Unvested, Weighted Average Grant Date Fair Value, beginning of period (in dollars per share)	$50.10	'	'
Shares Granted, Weighted Average Grant Date Fair Value (in dollars per share)	$55.35	'	'
Shares Vested, Weighted Average Grant Date Fair Value (in dollars per share)	$44.57	'	'
Shares Forfeited, Weighted Average Grant Date Fair Value (in dollars per share)	$53.69	'	'
Shares, Unvested, Weighted Average Grant Date Fair Value, end of period (in dollars per share)	$53.47	$50.10	'
Total Unrecognized Compensation Cost	19,600,000	'	'
Expected to be Recognized over a Weighted Average Period	'3 years 6 months	'	'
Total Fair Value, Vested in period	$4,400,000	$3,300,000	$3,700,000
Minimum	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Award Vesting Period (in years)	'5 years	'	'
Minimum \| Restricted Stock	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Award Vesting Period (in years)	'3 years	'	'
Maximum	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Award Vesting Period (in years)	'10 years	'	'
Maximum \| Restricted Stock	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Award Vesting Period (in years)	'5 years	'	'

STOCKBASED_COMPENSATION_AND_EM4

STOCK-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS - PERFORMANCE STOCK AWARDS (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Recordable Workplace Injury Rate (workers per year)	'	100	'
Expected Forfeiture Rate Employees	7.00%	'	'
Expected Forfeiture Rate, Executives and Directors	4.00%	'	'
Number of Performance Criteria	3	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]	'	'	'
Total Unrecognized Compensation Cost	$0	'	'
Performance Stock Awards	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected Forfeiture Rate Employees	7.00%	'	'
Expected Forfeiture Rate, Executives and Directors	4.00%	'	'
Performance Evaluation Stock-Based Compensation	'2 years	'2 years	'2 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]	'	'	'
Number of Shares, Unvested at beginning of period	65,336	'	'
Number of Shares, Granted	114,453	'	'
Number of Shares, Forfeited	-69,928	'	'
Number of Shares, Unvested at end of period	109,861	65,336	'
Shares, Unvested, Weighted Average Grant Date Fair Value, beginning of period (in dollars per share)	$66.96	'	'
Shares Granted, Weighted Average Grant Date Fair Value (in dollars per share)	$54.27	'	'
Shares Forfeited, Weighted Average Exercise Price (in dollars per share)	$66.12	'	'
Shares, Unvested, Weighted Average Grant Date Fair Value, end of period (in dollars per share)	$54.27	$66.96	'
Total Unrecognized Compensation Cost	0	'	'
Total Fair Value, Vested in period	'	$6,000,000	$16,800,000

STOCKBASED_COMPENSATION_AND_EM5

STOCK-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS - EMPLOYEE STOCK PURCHASE PLAN (Details) (USD $)

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

31-May-95

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2005

31-May-95

Dec. 31, 2013

persons

United States Defined Contribution Plan

Canadian Defined Contribution Plan

Fair Value, Inputs, Level 1

Fair Value, Inputs, Level 2

2005 Employee Stock Purchase Plan

Last Day of the quarterly Offering

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Employee Stock Purchase Plan, Number of Shares Authorized

2,000,000

Quarterly Offerings of Shares

100,000

Share Based Compensation Arrangement By Share Based Payment Award, Additional Shares Authorized

1,000,000

Common Stock, Capital Shares Reserved for Future Issuance

340,780

Maximum Employee Subscription Rate

10.00%

Payroll Deduction to Purchase Common Stock

85.00%

Discount from Market Price at Offering Date

15.00%

Weighted Average per Share Fair Values of the Purchase Rights (in dollars per share)

$9.61

$10.29

Number of active non-supervisory Canadian employees

Defined Benefit Plan, Net Periodic Benefit Cost

$300,000

$200,000

Pension assets measured at fair value

9,453,000

8,630,000

7,591,000

6,524,000

1,862,000

2,106,000

Defined Benefit Plan, Benefit Obligation

10,307,000

9,909,000

Defined Contribution Plan, Cost Recognized

$8,900,000

$4,800,000

$3,900,000

$3,100,000

$2,100,000

$1,600,000

COMMITMENTS_AND_CONTINGENCIES_1

COMMITMENTS AND CONTINGENCIES (Details)

1 Months Ended

12 Months Ended

Oct. 31, 2010

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 1999

Dec. 31, 1968

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2002

Dec. 31, 2013

Dec. 31, 2012

customer

USD ($)

Legal and Administrative Proceedings

Ville Mercier

Superfund Proceedings

Wichita Property

Certain Other Third Party Sites

Safety-Kleen

Federal and State Enforcement Actions

claims

USD ($)

CAD

Municipalities

Permits

USD ($)

acre

sites

USD ($)

sites

Proceedings

facilties

Legal and Administrative Proceedings

Loss Contingency Accrual, at Carrying Value

$41,700,000

$38,600,000

$34,600,000

Possible increase in legal and administrative proceedings

3,500,000

100,000

Reserves relating to legal and administrative proceedings

7,100,000

Number of permits issued by government, for dumping organic liquid

Number of neighboring municipalities filing separate legal proceedings against the Mercier Subsidiary and the Government of Quebec

General Damages Sought

2,900,000

Punitive Damages Sought

10,000,000

Accrued remedial liabilities

172,498,000

183,346,000

135,320,000

34,600,000

13,600,000

14,200,000

Loss Contingency, Claims Settled and Dismissed, Number

Number of proceedings

Number of customers filing a complaint

Superfund Proceedings

Number of sites subject to proceedings under federal or state superfund laws

123

Number of sites owned by the entity subject to proceedings under federal or state superfund laws

123

Number of sites owned by third parties subject to proceedings under federal or state Superfund laws

121

Third party sites requiring expenditure on remediation

Number of sites for which environmental remediation expense is settled

Number of sites for which environmental remediation expense is not required

Number of sites which potential liability could exceed $100,000

State-designated superfund site acquired, total acres

1,400

Indemnification agreement with third party sites

Notices received from owners of third party sites seeking indemnification from the company

Federal and State Enforcement Actions

Number of proceedings

Sanctions relating to waste treatment

$100,000,000

$100,000

Imputed Interest Minimum

4.00%

Imputed Interest Rate Maximum

16.00%

COMMITMENTS_AND_CONTINGENCIES_2

COMMITMENTS AND CONTINGENCIES LEASES (Details) (USD $)	12 Months Ended
COMMITMENTS AND CONTINGENCIES LEASES (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]	'	'	'
Lease Terms Range Minimum	'1 year	'	'
Lease Terms Range Maximum	'25 years	'	'
2014 Total Capital Leases	$1,472,000	'	'
2015 Total Capital Leases	1,458,000	'	'
2016 Total Capital Leases	0	'	'
2017 Total Capital Leases	0	'	'
2018 Total Capital Leases	0	'	'
Thereafter Total Capital Leases	0	'	'
Total minimum lease payments Total Capital Leases	2,930,000	'	'
Less: imputed interest at interest rates ranging from 4.0% to 16.0%	166,000	'	'
Present value of future minimum lease payments	2,764,000	'	'
Less: current portion of capital lease obligations	1,329,000	5,092,000	'
Long-term capital lease obligations	1,435,000	2,879,000	'
2014 Total Operating Leases	46,222,000	'	'
2015 Total Operating Leases	35,875,000	'	'
2016 Total Operating Leases	27,891,000	'	'
2017 Total Operating Leases	20,433,000	'	'
2018 Total Operating Leases	14,571,000	'	'
Thereafter Total Operating Leases	30,606,000	'	'
Total minimum lease payments Total Operating Leases	175,598,000	'	'
Imputed Interest Minimum	4.00%	'	'
Imputed Interest Rate Maximum	16.00%	'	'
Operating Leases, Rent Expense, Net	$124,400,000	$102,900,000	$86,700,000

COMMITMENTS_AND_CONTINGENCIES_3

COMMITMENTS AND CONTINGENCIES OTHER CONTINGENCIES (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Product Liability Contingency [Line Items]	'	'
Retention for Environmental Impairment	$1,000,000	'
Self-Insurance Liabilities	33,100,000	35,100,000
Weighted average risk free discount rate for self insurance liabilities	0.90%	0.50%
2014	12,581,000	'
2015	7,549,000	'
2016	5,820,000	'
2017	2,618,000	'
2018	2,183,000	'
Thereafter	2,862,000	'
Undiscounted self-insurance liabilities	33,613,000	'
Less: Discount	469,000	'
Total self-insurance liabilities (included in accrued expenses)	33,144,000	'
Minimum	'	'
Product Liability Contingency [Line Items]	'	'
Deductible Health Insurance Policy	250,000	'
Maximum	'	'
Product Liability Contingency [Line Items]	'	'
Deductible Health Insurance Policy	275,000	'
Safety-Kleen	'	'
Product Liability Contingency [Line Items]	'	'
Deductible per Occurrence for Workers Compensation	1,000,000	'
Deductible per Occurrence for General Liability	2,000,000	'
Deductible per Occurrence for Vehicle Liability	$2,000,000	'

SEGMENT_REPORTING_Details

SEGMENT REPORTING (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	ReportableSegments	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Reporting segments number	'	'	'	'	'	'	'	'	5	'	'
Number of operations for which the revenues are insignificant	'	'	'	'	'	'	'	'	2	'	'
Total revenues	$879,430	$907,535	$860,528	$862,163	$558,962	$533,806	$523,118	$572,022	3,509,656	$2,187,908	$1,984,136
Adjusted EBITDA, Total	'	'	'	'	'	'	'	'	510,105	373,767	350,008
Reconciliation to Consolidated Statements of Income:	'	'	'	'	'	'	'	'	'	'	'
Pre-tax, non-cash acquisition accounting inventory adjustment	'	'	'	'	'	'	'	'	13,559	0	0
Accretion of environmental liabilities	'	'	'	'	'	'	'	'	11,541	9,917	9,680
Depreciation and amortization	'	'	'	'	'	'	'	'	264,449	161,646	122,663
Income from operations	58,877	73,608	53,243	34,828	36,231	56,739	47,533	61,701	220,556	202,204	217,665
Other (income) expense	325	150	-1,655	-525	337	91	75	299	-1,705	802	-6,402
Loss on early extinguishment of debt	'	'	'	'	'	'	'	'	0	26,385	0
Interest expense, net of interest income	'	'	'	'	'	'	'	'	78,376	47,287	39,389
Income before provision (benefit) for income taxes	'	'	'	'	'	'	'	'	143,885	127,730	184,678
Technical Services	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	1,147,815	991,696	945,741
Adjusted EBITDA, Total	'	'	'	'	'	'	'	'	285,520	249,829	240,494
Oil Refining and Recycling	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	336,981	'	'
Adjusted EBITDA, Total	'	'	'	'	'	'	'	'	57,314	'	'
Environmental Services	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	770,745	0	0
Adjusted EBITDA, Total	'	'	'	'	'	'	'	'	112,413	0	0
Environmental Services \| Yellowstone River	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	'	'	43,600
Industrial and Field Services	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	866,979	787,253	695,893
Adjusted EBITDA, Total	'	'	'	'	'	'	'	'	176,952	158,931	136,380
Oil and Gas Field Services	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	399,500	409,353	343,192
Adjusted EBITDA, Total	'	'	'	'	'	'	'	'	68,063	77,048	77,870
Corporate Items	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	-12,364	-394	-690
Adjusted EBITDA, Total	'	'	'	'	'	'	'	'	-190,157	-112,041	-104,736
Operating segments	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	3,509,656	2,187,908	1,984,136
Operating segments \| Technical Services	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	1,023,926	957,764	910,896
Operating segments \| Oil Refining and Recycling	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	583,567	0	0
Operating segments \| Environmental Services	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	610,076	0	0
Operating segments \| Industrial and Field Services	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	908,556	828,119	731,626
Operating segments \| Oil and Gas Field Services	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	392,472	400,549	340,563
Operating segments \| Corporate Items	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	-8,941	1,476	1,051
Intersegment	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	'	'	'
Intersegment \| Technical Services	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	120,382	31,637	32,340
Intersegment \| Oil Refining and Recycling	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	-246,586	0	0
Intersegment \| Environmental Services	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	160,585	0	0
Intersegment \| Industrial and Field Services	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	-41,751	-40,930	-35,370
Intersegment \| Oil and Gas Field Services	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	7,370	9,293	3,030
Intersegment \| Corporate Items	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	0	0	0
Corporate Items (non-segment)	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	0	0	0
Corporate Items (non-segment) \| Technical Services	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	3,507	2,295	2,505
Corporate Items (non-segment) \| Oil Refining and Recycling	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	0	0	0
Corporate Items (non-segment) \| Environmental Services	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	84	0	0
Corporate Items (non-segment) \| Industrial and Field Services	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	174	64	-363
Corporate Items (non-segment) \| Oil and Gas Field Services	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	-342	-489	-401
Corporate Items (non-segment) \| Corporate Items	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	-3,423	($1,870)	($1,741)

SEGMENT_REPORTING_REVENUE_PROP

SEGMENT REPORTING - REVENUE, PROPERTY, PLANT AND EQUIPMENT AND INTANGIBLE ASSETS OUTSIDE OF THE UNITED STATES (Details) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 28, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 28, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 28, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

United States and Puerto Rico

United States

Canada

Other International Locations

Technical Services

Oil Refining and Recycling

Environmental Services

Industrial and Field Services

Oil and Gas Field Services

Corporate Items

Operating segments

Technical Services

Oil Refining and Recycling

Environmental Services

Industrial and Field Services

Oil and Gas Field Services

Corporate Items

Total revenues

$879,430

$907,535

$860,528

$862,163

$558,962

$533,806

$523,118

$572,022

$3,509,656

$2,187,908

$1,984,136

$2,376,200

$1,254,200

$1,149,400

$1,125,000

$933,000

$833,600

$1,147,815

$991,696

$945,741

$336,981

$770,745

$866,979

$787,253

$695,893

$399,500

$409,353

$343,192

($12,364)

($394)

($690)

$3,509,656

$2,187,908

$1,984,136

$1,023,926

$957,764

$910,896

$583,567

$610,076

$908,556

$828,119

$731,626

$392,472

$400,549

$340,563

($8,941)

$1,476

$1,051

Segment reporting information revenue percent

67.70%

57.30%

57.90%

32.10%

42.60%

42.00%

1.00%

Property, plant and equipment, net

1,602,170

1,533,053

1,602,170

1,533,053

652,000

642,100

400,544

405,447

211,513

178,210

239,596

239,993

405,327

371,386

237,335

257,985

107,855

80,032

Permits and other intangibles, net

569,973

590,044

569,973

590,044

110,800

74,100

80,302

86,403

160,807

151,840

265,104

277,460

35,332

41,163

28,428

33,178

Property Plant And Equipment Net Percent

40.70%

41.90%

Intangible Assets Net Excluding Goodwill Percent

19.40%

12.60%

Goodwill

570,960

579,715

570,960

579,715

122,392

45,599

45,991

171,161

173,158

173,200

172,308

174,089

174,100

144,385

146,715

75,400

37,507

39,762

Total intangible assets and goodwill

1,140,933

1,169,759

1,140,933

1,169,759

125,901

132,394

331,968

324,998

437,412

451,549

179,717

187,878

65,935

72,940

Total assets

$3,953,678

$3,838,086

$3,953,678

$3,838,086

$2,684,686

$2,555,926

$1,266,505

$1,281,384

$2,487

$776

$699,675

$716,309

$643,256

$636,745

$774,401

$815,446

$634,541

$612,664

$395,805

$348,771

$806,000

$708,151

GUARANTOR_AND_NONGUARANTOR_SUB2

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES Balance Sheet (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract]	'	'	'	'
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions	100.00%	'	'	'
Assets:	'	'	'	'
Cash and cash equivalents	$310,073	$229,836	$260,723	$302,210
Accounts receivable, net	579,394	546,136	'	'
Property, plant and equipment, net	1,602,170	1,533,053	'	'
Goodwill	570,960	579,715	122,392	'
Permits and other intangibles, net	569,973	590,044	'	'
Other long-term assets	1,180,329	1,209,774	'	'
Total assets	3,953,678	3,838,086	'	'
Liabilities and Stockholders' Equity:	'	'	'	'
Current liabilities	639,545	588,666	'	'
Long-term obligations	1,400,000	1,400,000	'	'
Capital lease obligations, net	1,435	2,879	'	'
Other long-term liabilities	246,947	215,412	'	'
Stockholders' equity	1,475,639	1,432,072	900,987	780,827
Total liabilities and stockholders' equity	3,953,678	3,838,086	'	'
Clean Harbors, Inc.	'	'	'	'
Assets:	'	'	'	'
Cash and cash equivalents	1,006	35,214	91,581	100,476
Intercompany receivables	269,580	296,023	'	'
Accounts receivable, net	0	0	'	'
Other current assets	24,087	38,295	'	'
Property, plant and equipment, net	0	0	'	'
Investments in subsidiaries	2,683,158	2,528,699	'	'
Intercompany debt receivable	0	0	'	'
Goodwill	0	0	'	'
Permits and other intangibles, net	0	0	'	'
Other long-term assets	23,770	21,141	'	'
Total assets	3,001,601	2,919,372	'	'
Liabilities and Stockholders' Equity:	'	'	'	'
Current liabilities	33,626	32,586	'	'
Intercompany payables	0	0	'	'
Closure, post-closure and remedial liabilities, net	0	0	'	'
Long-term obligations	1,400,000	1,400,000	'	'
Capital lease obligations, net	0	0	'	'
Intercompany debt payable	3,701	3,701	'	'
Other long-term liabilities	88,635	51,013	'	'
Total liabilities	1,525,962	1,487,300	'	'
Stockholders' equity	1,475,639	1,432,072	'	'
Total liabilities and stockholders' equity	3,001,601	2,919,372	'	'
U.S. Guarantor Subsidiaries	'	'	'	'
Assets:	'	'	'	'
Cash and cash equivalents	235,445	140,683	128,071	124,582
Intercompany receivables	2,448	17,704	'	'
Accounts receivable, net	387,006	345,891	'	'
Other current assets	182,881	186,640	'	'
Property, plant and equipment, net	945,280	881,975	'	'
Investments in subsidiaries	967,186	850,011	'	'
Intercompany debt receivable	493,402	508,067	'	'
Goodwill	415,541	413,362	'	'
Permits and other intangibles, net	458,917	464,455	'	'
Other long-term assets	7,018	9,125	'	'
Total assets	4,095,124	3,817,913	'	'
Liabilities and Stockholders' Equity:	'	'	'	'
Current liabilities	466,454	417,429	'	'
Intercompany payables	499,749	412,594	'	'
Closure, post-closure and remedial liabilities, net	158,298	164,506	'	'
Long-term obligations	0	0	'	'
Capital lease obligations, net	191	301	'	'
Intercompany debt payable	0	0	'	'
Other long-term liabilities	103,125	108,694	'	'
Total liabilities	1,227,817	1,103,524	'	'
Stockholders' equity	2,867,307	2,714,389	'	'
Total liabilities and stockholders' equity	4,095,124	3,817,913	'	'
Foreign Non-Guarantor Subsidiaries	'	'	'	'
Assets:	'	'	'	'
Cash and cash equivalents	73,622	53,939	41,071	77,152
Intercompany receivables	230,224	116,571	'	'
Accounts receivable, net	192,388	200,245	'	'
Other current assets	74,744	94,352	'	'
Property, plant and equipment, net	656,890	651,078	'	'
Investments in subsidiaries	144,953	144,953	'	'
Intercompany debt receivable	3,701	3,701	'	'
Goodwill	155,419	166,353	'	'
Permits and other intangibles, net	111,056	125,589	'	'
Other long-term assets	8,608	9,749	'	'
Total assets	1,651,605	1,566,530	'	'
Liabilities and Stockholders' Equity:	'	'	'	'
Current liabilities	139,465	138,651	'	'
Intercompany payables	2,503	17,704	'	'
Closure, post-closure and remedial liabilities, net	31,814	34,551	'	'
Long-term obligations	0	0	'	'
Capital lease obligations, net	1,244	2,578	'	'
Intercompany debt payable	493,402	508,067	'	'
Other long-term liabilities	55,187	55,705	'	'
Total liabilities	723,615	757,256	'	'
Stockholders' equity	927,990	809,274	'	'
Total liabilities and stockholders' equity	1,651,605	1,566,530	'	'
Consolidating Adjustments	'	'	'	'
Assets:	'	'	'	'
Cash and cash equivalents	0	0	'	'
Intercompany receivables	-502,252	-430,298	'	'
Accounts receivable, net	0	0	'	'
Other current assets	0	0	'	'
Property, plant and equipment, net	0	0	'	'
Investments in subsidiaries	-3,795,297	-3,523,663	'	'
Intercompany debt receivable	-497,103	-511,768	'	'
Goodwill	0	0	'	'
Permits and other intangibles, net	0	0	'	'
Other long-term assets	0	0	'	'
Total assets	-4,794,652	-4,465,729	'	'
Liabilities and Stockholders' Equity:	'	'	'	'
Current liabilities	0	0	'	'
Intercompany payables	-502,252	-430,298	'	'
Closure, post-closure and remedial liabilities, net	0	0	'	'
Long-term obligations	0	0	'	'
Capital lease obligations, net	0	0	'	'
Intercompany debt payable	-497,103	-511,768	'	'
Other long-term liabilities	0	0	'	'
Total liabilities	-999,355	-942,066	'	'
Stockholders' equity	-3,795,297	-3,523,663	'	'
Total liabilities and stockholders' equity	-4,794,652	-4,465,729	'	'
Parent	'	'	'	'
Assets:	'	'	'	'
Cash and cash equivalents	310,073	229,836	260,723	302,210
Intercompany receivables	0	0	'	'
Accounts receivable, net	579,394	546,136	'	'
Other current assets	281,712	319,287	'	'
Property, plant and equipment, net	1,602,170	1,533,053	'	'
Investments in subsidiaries	0	0	'	'
Intercompany debt receivable	0	0	'	'
Goodwill	570,960	579,715	'	'
Permits and other intangibles, net	569,973	590,044	'	'
Other long-term assets	39,396	40,015	'	'
Total assets	3,953,678	3,838,086	'	'
Liabilities and Stockholders' Equity:	'	'	'	'
Current liabilities	639,545	588,666	'	'
Intercompany payables	0	0	'	'
Closure, post-closure and remedial liabilities, net	190,112	199,057	'	'
Long-term obligations	1,400,000	1,400,000	'	'
Capital lease obligations, net	1,435	2,879	'	'
Intercompany debt payable	0	0	'	'
Other long-term liabilities	246,947	215,412	'	'
Total liabilities	2,478,039	2,406,014	'	'
Stockholders' equity	1,475,639	1,432,072	'	'
Total liabilities and stockholders' equity	$3,953,678	$3,838,086	'	'

GUARANTOR_AND_NONGUARANTOR_SUB3

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES Income Statement (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Consolidating statement of income	'	'	'	'	'	'	'	'	'	'	'
Service revenues	'	'	'	'	'	'	'	'	$2,729,205	$2,063,160	$1,882,979
Product revenues	'	'	'	'	'	'	'	'	780,451	124,748	101,157
Total revenues	879,430	907,535	860,528	862,163	558,962	533,806	523,118	572,022	3,509,656	2,187,908	1,984,136
Service revenues	'	'	'	'	'	'	'	'	1,874,448	1,439,594	1,301,363
Product revenues	'	'	'	'	'	'	'	'	668,185	101,027	78,628
Total cost of revenues	645,164	647,119	614,326	636,024	399,743	372,940	367,623	400,315	2,542,633	1,540,621	1,379,991
Selling, general and administrative expenses	'	'	'	'	'	'	'	'	470,477	273,520	254,137
Accretion of environmental liabilities	'	'	'	'	'	'	'	'	11,541	9,917	9,680
Depreciation and amortization	'	'	'	'	'	'	'	'	264,449	161,646	122,663
Income from operations	58,877	73,608	53,243	34,828	36,231	56,739	47,533	61,701	220,556	202,204	217,665
Other income (expense)	-325	-150	1,655	525	-337	-91	-75	-299	1,705	-802	6,402
Loss on early extinguishment of debt	'	'	'	'	'	'	'	'	0	-26,385	0
Interest (expense) income, net	'	'	'	'	'	'	'	'	-78,376	-47,287	-39,389
Equity in earnings of subsidiaries	'	'	'	'	'	'	'	'	0	0	0
Intercompany dividend income (expense)	'	'	'	'	'	'	'	'	0	0	0
Intercompany interest income (expense)	'	'	'	'	'	'	'	'	0	0	0
Income before provision (benefit) for income taxes	'	'	'	'	'	'	'	'	143,885	127,730	184,678
Provision (benefit) for income taxes	'	'	'	'	'	'	'	'	48,319	-1,944	57,426
Net income	26,801	35,361	22,902	10,502	61,874	12,359	23,426	32,015	95,566	129,674	127,252
Other comprehensive income	'	'	'	'	'	'	'	'	-69,188	18,279	-19,406
Comprehensive income	'	'	'	'	'	'	'	'	26,378	147,953	107,846
Clean Harbors, Inc.	'	'	'	'	'	'	'	'	'	'	'
Consolidating statement of income	'	'	'	'	'	'	'	'	'	'	'
Service revenues	'	'	'	'	'	'	'	'	0	0	0
Product revenues	'	'	'	'	'	'	'	'	0	0	0
Total revenues	'	'	'	'	'	'	'	'	0	0	0
Service revenues	'	'	'	'	'	'	'	'	0	0	0
Product revenues	'	'	'	'	'	'	'	'	0	0	0
Total cost of revenues	'	'	'	'	'	'	'	'	0	0	0
Selling, general and administrative expenses	'	'	'	'	'	'	'	'	109	66	100
Accretion of environmental liabilities	'	'	'	'	'	'	'	'	0	0	0
Depreciation and amortization	'	'	'	'	'	'	'	'	0	0	0
Income from operations	'	'	'	'	'	'	'	'	-109	-66	-100
Other income (expense)	'	'	'	'	'	'	'	'	0	0	0
Loss on early extinguishment of debt	'	'	'	'	'	'	'	'	'	-26,385	'
Interest (expense) income, net	'	'	'	'	'	'	'	'	-79,017	-46,221	-38,755
Equity in earnings of subsidiaries	'	'	'	'	'	'	'	'	184,498	187,432	174,029
Intercompany dividend income (expense)	'	'	'	'	'	'	'	'	0	10,010	10,186
Intercompany interest income (expense)	'	'	'	'	'	'	'	'	0	0	0
Income before provision (benefit) for income taxes	'	'	'	'	'	'	'	'	105,372	124,770	145,360
Provision (benefit) for income taxes	'	'	'	'	'	'	'	'	9,806	-4,904	18,108
Net income	'	'	'	'	'	'	'	'	95,566	129,674	127,252
Other comprehensive income	'	'	'	'	'	'	'	'	-69,188	18,279	-19,406
Comprehensive income	'	'	'	'	'	'	'	'	26,378	147,953	107,846
U.S. Guarantor Subsidiaries	'	'	'	'	'	'	'	'	'	'	'
Consolidating statement of income	'	'	'	'	'	'	'	'	'	'	'
Service revenues	'	'	'	'	'	'	'	'	1,754,356	1,155,993	1,055,095
Product revenues	'	'	'	'	'	'	'	'	611,548	87,460	86,840
Total revenues	'	'	'	'	'	'	'	'	2,365,904	1,243,453	1,141,935
Service revenues	'	'	'	'	'	'	'	'	1,187,946	787,228	720,189
Product revenues	'	'	'	'	'	'	'	'	524,318	70,085	66,582
Total cost of revenues	'	'	'	'	'	'	'	'	1,712,264	857,313	786,771
Selling, general and administrative expenses	'	'	'	'	'	'	'	'	352,387	173,190	165,882
Accretion of environmental liabilities	'	'	'	'	'	'	'	'	9,817	8,592	8,442
Depreciation and amortization	'	'	'	'	'	'	'	'	169,629	80,154	58,328
Income from operations	'	'	'	'	'	'	'	'	121,807	124,204	122,512
Other income (expense)	'	'	'	'	'	'	'	'	3,211	-154	3,864
Loss on early extinguishment of debt	'	'	'	'	'	'	'	'	'	0	'
Interest (expense) income, net	'	'	'	'	'	'	'	'	224	0	18
Equity in earnings of subsidiaries	'	'	'	'	'	'	'	'	79,427	65,452	84,789
Intercompany dividend income (expense)	'	'	'	'	'	'	'	'	0	0	0
Intercompany interest income (expense)	'	'	'	'	'	'	'	'	40,304	41,636	37,870
Income before provision (benefit) for income taxes	'	'	'	'	'	'	'	'	244,973	231,138	249,053
Provision (benefit) for income taxes	'	'	'	'	'	'	'	'	23,113	-8,852	29,341
Net income	'	'	'	'	'	'	'	'	221,860	239,990	219,712
Other comprehensive income	'	'	'	'	'	'	'	'	-69,188	18,279	-19,406
Comprehensive income	'	'	'	'	'	'	'	'	152,672	258,269	200,306
Foreign Non-Guarantor Subsidiaries	'	'	'	'	'	'	'	'	'	'	'
Consolidating statement of income	'	'	'	'	'	'	'	'	'	'	'
Service revenues	'	'	'	'	'	'	'	'	989,620	927,240	854,306
Product revenues	'	'	'	'	'	'	'	'	173,127	38,500	15,737
Total revenues	'	'	'	'	'	'	'	'	1,162,747	965,740	870,043
Service revenues	'	'	'	'	'	'	'	'	701,273	672,439	607,596
Product revenues	'	'	'	'	'	'	'	'	148,091	32,154	13,466
Total cost of revenues	'	'	'	'	'	'	'	'	849,364	704,593	621,062
Selling, general and administrative expenses	'	'	'	'	'	'	'	'	117,981	100,264	88,155
Accretion of environmental liabilities	'	'	'	'	'	'	'	'	1,724	1,325	1,238
Depreciation and amortization	'	'	'	'	'	'	'	'	94,820	81,492	64,335
Income from operations	'	'	'	'	'	'	'	'	98,858	78,066	95,253
Other income (expense)	'	'	'	'	'	'	'	'	-1,506	-648	2,538
Loss on early extinguishment of debt	'	'	'	'	'	'	'	'	'	0	'
Interest (expense) income, net	'	'	'	'	'	'	'	'	417	-1,066	-652
Equity in earnings of subsidiaries	'	'	'	'	'	'	'	'	0	0	0
Intercompany dividend income (expense)	'	'	'	'	'	'	'	'	13,292	13,805	13,832
Intercompany interest income (expense)	'	'	'	'	'	'	'	'	-40,304	-41,636	-37,870
Income before provision (benefit) for income taxes	'	'	'	'	'	'	'	'	70,757	48,521	73,101
Provision (benefit) for income taxes	'	'	'	'	'	'	'	'	15,400	11,812	9,977
Net income	'	'	'	'	'	'	'	'	55,357	36,709	63,124
Other comprehensive income	'	'	'	'	'	'	'	'	39,519	7,986	-8,381
Comprehensive income	'	'	'	'	'	'	'	'	94,876	44,695	54,743
Consolidating Adjustments	'	'	'	'	'	'	'	'	'	'	'
Consolidating statement of income	'	'	'	'	'	'	'	'	'	'	'
Service revenues	'	'	'	'	'	'	'	'	-14,771	-20,073	-26,422
Product revenues	'	'	'	'	'	'	'	'	-4,224	-1,212	-1,420
Total revenues	'	'	'	'	'	'	'	'	-18,995	-21,285	-27,842
Service revenues	'	'	'	'	'	'	'	'	-14,771	-20,073	-26,422
Product revenues	'	'	'	'	'	'	'	'	-4,224	-1,212	-1,420
Total cost of revenues	'	'	'	'	'	'	'	'	-18,995	-21,285	-27,842
Selling, general and administrative expenses	'	'	'	'	'	'	'	'	0	0	0
Accretion of environmental liabilities	'	'	'	'	'	'	'	'	0	0	0
Depreciation and amortization	'	'	'	'	'	'	'	'	0	0	0
Income from operations	'	'	'	'	'	'	'	'	0	0	0
Other income (expense)	'	'	'	'	'	'	'	'	0	0	0
Loss on early extinguishment of debt	'	'	'	'	'	'	'	'	'	0	'
Interest (expense) income, net	'	'	'	'	'	'	'	'	0	0	0
Equity in earnings of subsidiaries	'	'	'	'	'	'	'	'	-263,925	-252,884	-258,818
Intercompany dividend income (expense)	'	'	'	'	'	'	'	'	-13,292	-23,815	-24,018
Intercompany interest income (expense)	'	'	'	'	'	'	'	'	0	0	0
Income before provision (benefit) for income taxes	'	'	'	'	'	'	'	'	-277,217	-276,699	-282,836
Provision (benefit) for income taxes	'	'	'	'	'	'	'	'	0	0	0
Net income	'	'	'	'	'	'	'	'	-277,217	-276,699	-282,836
Other comprehensive income	'	'	'	'	'	'	'	'	29,669	-26,265	27,787
Comprehensive income	'	'	'	'	'	'	'	'	($247,548)	($302,964)	($255,049)

GUARANTOR_AND_NONGUARANTOR_SUB4

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES Cash Flows (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed consolidating statement of cash flows	'	'	'
Net cash from operating activities	$415,839	$324,365	$179,531
Cash flows from investing activities:	'	'	'
Additions to property, plant and equipment	-280,207	-197,397	-148,513
Proceeds from sales of fixed assets	4,699	8,125	6,794
Acquisitions, net of cash acquired	-63,264	-1,373,921	-336,960
Additions to intangible assets including costs to obtain or renew permits	-6,740	-4,046	-2,927
Purchase of marketable securities	0	-10,517	0
Proceeds from sales of marketable securities	0	0	425
Proceeds from sale of long-term investments	0	0	1,000
Other	0	5,120	0
Net cash used in investing activities	-345,512	-1,572,636	-480,181
Cash flows from financing activities:	'	'	'
Change in uncashed checks	12,268	-12,070	9,822
Proceeds from exercise of stock options	400	288	1,350
Remittance of shares, net	-731	-2,912	-4,061
Excess tax benefit of stock-based compensation	1,409	2,556	3,352
Deferred financing costs paid	-2,504	-19,056	-8,463
Proceeds from employee stock purchase plan	7,425	6,196	3,516
Payments on capital leases	-4,891	-6,599	-7,837
Issuance costs related to issuances of common stock	-250	0	0
Proceeds from issuance of common stock, net	0	369,520	0
Principal payments on debt	0	-520,000	0
Distribution of cash earned on employee participation plan	0	-55	-189
Issuance of senior unsecured notes, at par	0	1,400,000	0
Issuance of senior secured notes, including premium	0	0	261,250
Net cash from financing activities	13,126	1,217,868	258,740
Effect of exchange rate change on cash	-3,216	-484	423
Increase (decrease) in cash and cash equivalents	80,237	-30,887	-41,487
Cash and cash equivalents, beginning of year	229,836	260,723	302,210
Cash and cash equivalents, end of year	310,073	229,836	260,723
Clean Harbors, Inc.	'	'	'
Condensed consolidating statement of cash flows	'	'	'
Net cash from operating activities	-33,932	-45,655	-17,428
Cash flows from investing activities:	'	'	'
Additions to property, plant and equipment	0	0	0
Proceeds from sales of fixed assets	0	0	0
Acquisitions, net of cash acquired	-6,025	-1,257,259	0
Additions to intangible assets including costs to obtain or renew permits	0	0	0
Purchase of marketable securities	'	0	'
Proceeds from sales of marketable securities	'	'	0
Proceeds from sale of long-term investments	'	'	0
Other	'	0	'
Investment in subsidiaries	'	'	-258,597
Net cash used in investing activities	-6,025	-1,257,259	-258,597
Cash flows from financing activities:	'	'	'
Change in uncashed checks	0	0	0
Proceeds from exercise of stock options	400	288	1,350
Remittance of shares, net	-731	-2,912	-4,061
Excess tax benefit of stock-based compensation	1,409	2,556	3,352
Deferred financing costs paid	-2,504	-19,056	-8,463
Proceeds from employee stock purchase plan	7,425	6,196	3,516
Payments on capital leases	0	0	0
Issuance costs related to issuances of common stock	-250	'	'
Proceeds from issuance of common stock, net	'	369,520	'
Principal payments on debt	'	-520,000	'
Distribution of cash earned on employee participation plan	'	-55	0
Issuance of senior unsecured notes, at par	'	1,400,000	'
Issuance of senior secured notes, including premium	'	'	261,250
Interest (payments) / received	0	10,010	10,186
Interest (payments) / received	0	0	0
Intercompany debt	'	'	0
Net cash from financing activities	5,749	1,246,547	267,130
Effect of exchange rate change on cash	0	0	0
Increase (decrease) in cash and cash equivalents	-34,208	-56,367	-8,895
Cash and cash equivalents, beginning of year	35,214	91,581	100,476
Cash and cash equivalents, end of year	1,006	35,214	91,581
U.S. Guarantor Subsidiaries	'	'	'
Condensed consolidating statement of cash flows	'	'	'
Net cash from operating activities	264,491	179,425	90,015
Cash flows from investing activities:	'	'	'
Additions to property, plant and equipment	-145,395	-117,344	-92,531
Proceeds from sales of fixed assets	1,078	3,810	657
Acquisitions, net of cash acquired	-57,239	-63,351	-50,166
Additions to intangible assets including costs to obtain or renew permits	-5,247	-712	-465
Purchase of marketable securities	'	0	'
Proceeds from sales of marketable securities	'	'	0
Proceeds from sale of long-term investments	'	'	1,000
Other	'	500	'
Investment in subsidiaries	'	'	178,884
Net cash used in investing activities	-206,803	-177,097	37,379
Cash flows from financing activities:	'	'	'
Change in uncashed checks	9,922	-6,761	6,558
Proceeds from exercise of stock options	0	0	0
Remittance of shares, net	0	0	0
Excess tax benefit of stock-based compensation	0	0	0
Deferred financing costs paid	0	0	0
Proceeds from employee stock purchase plan	0	0	0
Payments on capital leases	-227	-850	-820
Issuance costs related to issuances of common stock	0	'	'
Proceeds from issuance of common stock, net	'	0	'
Principal payments on debt	'	0	'
Distribution of cash earned on employee participation plan	'	0	0
Issuance of senior unsecured notes, at par	'	0	'
Issuance of senior secured notes, including premium	'	'	0
Interest (payments) / received	-13,545	-23,815	-24,306
Interest (payments) / received	40,924	41,710	35,088
Intercompany debt	'	'	-140,425
Net cash from financing activities	37,074	10,284	-123,905
Effect of exchange rate change on cash	0	0	0
Increase (decrease) in cash and cash equivalents	94,762	12,612	3,489
Cash and cash equivalents, beginning of year	140,683	128,071	124,582
Cash and cash equivalents, end of year	235,445	140,683	128,071
Foreign Non-Guarantor Subsidiaries	'	'	'
Condensed consolidating statement of cash flows	'	'	'
Net cash from operating activities	185,280	190,595	106,944
Cash flows from investing activities:	'	'	'
Additions to property, plant and equipment	-134,812	-80,053	-55,982
Proceeds from sales of fixed assets	3,621	4,315	6,137
Acquisitions, net of cash acquired	0	-53,311	-286,794
Additions to intangible assets including costs to obtain or renew permits	-1,493	-3,334	-2,462
Purchase of marketable securities	'	-10,517	'
Proceeds from sales of marketable securities	'	'	425
Proceeds from sale of long-term investments	'	'	0
Other	'	4,620	'
Investment in subsidiaries	'	'	79,713
Net cash used in investing activities	-132,684	-138,280	-258,963
Cash flows from financing activities:	'	'	'
Change in uncashed checks	2,346	-5,309	3,264
Proceeds from exercise of stock options	0	0	0
Remittance of shares, net	0	0	0
Excess tax benefit of stock-based compensation	0	0	0
Deferred financing costs paid	0	0	0
Proceeds from employee stock purchase plan	0	0	0
Payments on capital leases	-4,664	-5,749	-7,017
Issuance costs related to issuances of common stock	0	'	'
Proceeds from issuance of common stock, net	'	0	'
Principal payments on debt	'	0	'
Distribution of cash earned on employee participation plan	'	0	-189
Issuance of senior unsecured notes, at par	'	0	'
Issuance of senior secured notes, including premium	'	'	0
Interest (payments) / received	13,545	13,805	14,120
Interest (payments) / received	-40,924	-41,710	-35,088
Intercompany debt	'	'	140,425
Net cash from financing activities	-29,697	-38,963	115,515
Effect of exchange rate change on cash	-3,216	-484	423
Increase (decrease) in cash and cash equivalents	19,683	12,868	-36,081
Cash and cash equivalents, beginning of year	53,939	41,071	77,152
Cash and cash equivalents, end of year	73,622	53,939	41,071
Parent	'	'	'
Condensed consolidating statement of cash flows	'	'	'
Net cash from operating activities	415,839	324,365	179,531
Cash flows from investing activities:	'	'	'
Additions to property, plant and equipment	-280,207	-197,397	-148,513
Proceeds from sales of fixed assets	4,699	8,125	6,794
Acquisitions, net of cash acquired	-63,264	-1,373,921	-336,960
Additions to intangible assets including costs to obtain or renew permits	-6,740	-4,046	-2,927
Purchase of marketable securities	'	-10,517	'
Proceeds from sales of marketable securities	'	'	425
Proceeds from sale of long-term investments	'	'	1,000
Other	'	5,120	'
Investment in subsidiaries	'	'	0
Net cash used in investing activities	-345,512	-1,572,636	-480,181
Cash flows from financing activities:	'	'	'
Change in uncashed checks	12,268	-12,070	9,822
Proceeds from exercise of stock options	400	288	1,350
Remittance of shares, net	-731	-2,912	-4,061
Excess tax benefit of stock-based compensation	1,409	2,556	3,352
Deferred financing costs paid	-2,504	-19,056	-8,463
Proceeds from employee stock purchase plan	7,425	6,196	3,516
Payments on capital leases	-4,891	-6,599	-7,837
Issuance costs related to issuances of common stock	-250	'	'
Proceeds from issuance of common stock, net	'	369,520	'
Principal payments on debt	'	-520,000	'
Distribution of cash earned on employee participation plan	'	-55	-189
Issuance of senior unsecured notes, at par	'	1,400,000	'
Issuance of senior secured notes, including premium	'	'	261,250
Interest (payments) / received	0	0	0
Interest (payments) / received	0	0	0
Intercompany debt	'	'	0
Net cash from financing activities	13,126	1,217,868	258,740
Effect of exchange rate change on cash	-3,216	-484	423
Increase (decrease) in cash and cash equivalents	80,237	-30,887	-41,487
Cash and cash equivalents, beginning of year	229,836	260,723	302,210
Cash and cash equivalents, end of year	$310,073	$229,836	$260,723

QUARTERLY_DATA_UNAUDITED_Detai

QUARTERLY DATA (UNAUDITED) (Details) (USD $)	3 Months Ended								12 Months Ended			3 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Jul. 30, 2012
												Change in Tax Benefits	Secured Senior Notes 2016
													Senior Notes
Quarterly [Line Items]	'	'	'	'	'	'	'	'	'	'	'	'	'
Revenues	$879,430,000	$907,535,000	$860,528,000	$862,163,000	$558,962,000	$533,806,000	$523,118,000	$572,022,000	$3,509,656,000	$2,187,908,000	$1,984,136,000	'	'
Cost of revenues	645,164,000	647,119,000	614,326,000	636,024,000	399,743,000	372,940,000	367,623,000	400,315,000	2,542,633,000	1,540,621,000	1,379,991,000	'	'
Gross profit	234,266,000	260,416,000	246,202,000	226,139,000	159,219,000	160,866,000	155,495,000	171,707,000	'	'	'	'	'
Income from operations	58,877,000	73,608,000	53,243,000	34,828,000	36,231,000	56,739,000	47,533,000	61,701,000	220,556,000	202,204,000	217,665,000	'	'
Other income (expense)	-325,000	-150,000	1,655,000	525,000	-337,000	-91,000	-75,000	-299,000	1,705,000	-802,000	6,402,000	'	'
Net income	26,801,000	35,361,000	22,902,000	10,502,000	61,874,000	12,359,000	23,426,000	32,015,000	95,566,000	129,674,000	127,252,000	'	'
Basic income per share (in dollars per share)	$0.44	$0.58	$0.38	$0.17	$1.11	$0.23	$0.44	$0.60	$1.58	$2.41	$2.40	'	'
Diluted income per share (in dollars per share)	$0.44	$0.58	$0.38	$0.17	$1.11	$0.23	$0.44	$0.60	$1.57	$2.40	$2.39	'	'
Loss on early extinguishment of debt	'	'	'	'	'	'	'	'	0	26,385,000	0	'	'
Long-term Debt, Gross	'	'	'	'	'	'	'	'	'	'	'	'	520,000,000
Unrecognized Tax Benefits, Period Increase (Decrease)	'	'	'	'	'	'	'	'	'	'	'	($52,400,000)	'

SUBSEQUENT_EVENTS_Details

SUBSEQUENT EVENTS (Details) (Subsequent Event, USD $)	0 Months Ended
In Millions, unless otherwise specified	Feb. 25, 2014
Subsequent Event	'
Subsequent Event [Line Items]	'
Stock Repurchase Program, Authorized Amount	$150

SCHEDULE_II_VALUATION_AND_QUAL1

SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Safety-Kleen	'	'	'
Movement in Valuation Allowances and Reserves [Roll Forward]	'	'	'
Valuation Allowance, Deferred Tax Asset, Change in Amount	'	$13,800,000	'
Allowance for Doubtful Accounts	'	'	'
Movement in Valuation Allowances and Reserves [Roll Forward]	'	'	'
Balance Beginning of Period	1,246,000	1,830,000	2,084,000
Additions (deductions) charged	7,933,000	1,213,000	759,000
Changes to Reserves	1,825,000	1,797,000	1,013,000
Balance End of Period	7,354,000	1,246,000	1,830,000
Allowance for Sales Returns	'	'	'
Movement in Valuation Allowances and Reserves [Roll Forward]	'	'	'
Balance Beginning of Period	9,879,000	10,853,000	21,620,000
Additions (deductions) charged	16,401,000	18,847,000	13,846,000
Changes to Reserves	15,528,000	19,821,000	24,613,000
Balance End of Period	10,752,000	9,879,000	10,853,000
Valuation Allowance on Deferred Tax Assets	'	'	'
Movement in Valuation Allowances and Reserves [Roll Forward]	'	'	'
Balance Beginning of Period	26,325,000	11,473,000	12,919,000
Additions (deductions) charged	-1,545,000	-196,000	-1,593,000
Changes to Reserves	4,946,000	15,048,000	147,000
Balance End of Period	$29,726,000	$26,325,000	$11,473,000