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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:    
Net (loss) income $ (7,089)us-gaap_ProfitLoss $ 8,960us-gaap_ProfitLoss
Adjustments to reconcile net (loss) income to net cash from operating activities:    
Depreciation and amortization 68,356us-gaap_DepreciationDepletionAndAmortization 69,356us-gaap_DepreciationDepletionAndAmortization
Allowance for doubtful accounts 2,204us-gaap_ProvisionForDoubtfulAccounts 2,086us-gaap_ProvisionForDoubtfulAccounts
Amortization of deferred financing costs and debt discount 819us-gaap_AmortizationOfFinancingCostsAndDiscounts 824us-gaap_AmortizationOfFinancingCostsAndDiscounts
Accretion of environmental liabilities 2,619clh_AccretionOfEnvironmentalLiabilities 2,724clh_AccretionOfEnvironmentalLiabilities
Changes in environmental liability estimates 385us-gaap_OtherIncreaseDecreaseInEnvironmentalLiabilities (821)us-gaap_OtherIncreaseDecreaseInEnvironmentalLiabilities
Deferred income taxes (903)us-gaap_DeferredIncomeTaxExpenseBenefit 0us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation 1,850us-gaap_ShareBasedCompensation 2,278us-gaap_ShareBasedCompensation
Excess tax benefit of stock-based compensation (5)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (117)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Net tax benefit on stock based awards (111)us-gaap_DeferredTaxExpenseFromStockOptionsExercised 117us-gaap_DeferredTaxExpenseFromStockOptionsExercised
Other income (409)us-gaap_OtherNonoperatingIncomeExpense (4,178)us-gaap_OtherNonoperatingIncomeExpense
Environmental expenditures (5,604)us-gaap_PaymentsForEnvironmentalLiabilities (4,186)us-gaap_PaymentsForEnvironmentalLiabilities
Changes in assets and liabilities, net of acquisitions    
Accounts receivable and unbilled accounts receivable 27,065us-gaap_IncreaseDecreaseInAccountsReceivable (11,069)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories and supplies 22,131us-gaap_IncreaseDecreaseInInventories (1,709)us-gaap_IncreaseDecreaseInInventories
Other current assets 374us-gaap_IncreaseDecreaseInOtherOperatingAssets (15,722)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable 2,623us-gaap_IncreaseDecreaseInAccountsPayable (23,374)us-gaap_IncreaseDecreaseInAccountsPayable
Other current and long-term liabilities (29,528)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities (20,573)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash from operating activities 84,777us-gaap_NetCashProvidedByUsedInOperatingActivities 4,596us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:    
Additions to property, plant and equipment (52,949)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (75,005)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sales of fixed assets 760clh_ProceedsFromSalesOfFixedAssetsAndAssetsHeldForSale 876clh_ProceedsFromSalesOfFixedAssetsAndAssetsHeldForSale
Proceeds from sales of marketable securities 0us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities 12,870us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Additions to intangible assets, including costs to obtain or renew permits (1,171)us-gaap_PaymentsToAcquireIntangibleAssets (1,075)us-gaap_PaymentsToAcquireIntangibleAssets
Net cash used in investing activities (53,360)us-gaap_NetCashProvidedByUsedInInvestingActivities (62,334)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Change in uncashed checks (20,268)us-gaap_IncreaseDecreaseInOutstandingChecksFinancingActivities 21us-gaap_IncreaseDecreaseInOutstandingChecksFinancingActivities
Issuance of restricted shares, net of shares remitted (1,154)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (750)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Repurchases of common stock (15,379)us-gaap_PaymentsForRepurchaseOfCommonStock (1,225)us-gaap_PaymentsForRepurchaseOfCommonStock
Proceeds from employee stock purchase plan 0us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans 2,141us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans
Payments on capital leases (398)clh_RepaymentOfCapitalLeaseObligation (638)clh_RepaymentOfCapitalLeaseObligation
Excess tax benefit of stock-based compensation 5us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 117us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net cash from financing activities (37,194)us-gaap_NetCashProvidedByUsedInFinancingActivities (334)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate change on cash (7,363)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (2,994)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Decrease in cash and cash equivalents (13,140)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (61,066)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 246,879us-gaap_CashAndCashEquivalentsAtCarryingValue 310,073us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period 233,739us-gaap_CashAndCashEquivalentsAtCarryingValue 249,007us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash payments for interest and income taxes:    
Interest paid 21,667us-gaap_InterestPaidNet 21,436us-gaap_InterestPaidNet
Income taxes (received) paid (3,790)us-gaap_IncomeTaxesPaidNet 5,389us-gaap_IncomeTaxesPaidNet
Non-cash investing and financing activities:    
Accrual for repurchased shares 736clh_AccrualforRepurchasedShares 0clh_AccrualforRepurchasedShares
Property, plant and equipment accrued $ 22,832us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1 $ 26,715us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1