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