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(Provision for Tax Expense) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]      
Domestic $ 44,737,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 85,775,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 90,240,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign (6,215,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 58,110,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 37,490,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income before provision (benefit) for income taxes 38,522,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 143,885,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 127,730,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Current:      
Federal 17,184,000us-gaap_CurrentFederalTaxExpenseBenefit 5,264,000us-gaap_CurrentFederalTaxExpenseBenefit (29,401,000)us-gaap_CurrentFederalTaxExpenseBenefit
State 6,918,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 5,006,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit (10,736,000)us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign 10,428,000us-gaap_CurrentForeignTaxExpenseBenefit 6,930,000us-gaap_CurrentForeignTaxExpenseBenefit 4,030,000us-gaap_CurrentForeignTaxExpenseBenefit
Current Income Tax Expense (Benefit) 34,530,000us-gaap_CurrentIncomeTaxExpenseBenefit 17,200,000us-gaap_CurrentIncomeTaxExpenseBenefit (36,107,000)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred      
Federal 33,858,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 20,574,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 23,521,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State 1,840,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 2,074,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 2,865,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign (3,378,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit 8,471,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit 7,777,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred income taxes 32,320,000clh_DeferredIncomeTaxExpenseBenefitNetOfDiscontinuedOperations 31,119,000clh_DeferredIncomeTaxExpenseBenefitNetOfDiscontinuedOperations 34,163,000clh_DeferredIncomeTaxExpenseBenefitNetOfDiscontinuedOperations
Provision (benefit) for income taxes 66,850,000us-gaap_IncomeTaxExpenseBenefit 48,319,000us-gaap_IncomeTaxExpenseBenefit (1,944,000)us-gaap_IncomeTaxExpenseBenefit
Income Tax Contingency [Line Items]      
Unrecognized tax benefits, income tax penalties and interest accrued 400,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 200,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 1,400,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Effective income tax rate reconciliation, percent 173.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 33.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations (1.50%)us-gaap_EffectiveIncomeTaxRateContinuingOperations
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]      
Tax expense at US statutory rate 13,483,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 50,360,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 44,705,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit 7,429,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 4,052,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 3,526,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Foreign rate differential (2,916,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (10,478,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (8,607,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Non-deductible transaction costs 0us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther 657,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther 2,229,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Uncertain tax position releases 0clh_UncertainTaxPositionReleasesNetOfBenefit (4,010,000)clh_UncertainTaxPositionReleasesNetOfBenefit (52,424,000)clh_UncertainTaxPositionReleasesNetOfBenefit
Uncertain tax position interest and penalties 2,217,000clh_UncertainTaxPositionInterestAndPenaltiesNetOfBenefit 457,000clh_UncertainTaxPositionInterestAndPenaltiesNetOfBenefit 1,658,000clh_UncertainTaxPositionInterestAndPenaltiesNetOfBenefit
Goodwill impairment charge 44,273,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses 0us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses 0us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses
Other 2,364,000us-gaap_IncomeTaxReconciliationOtherAdjustments 7,281,000us-gaap_IncomeTaxReconciliationOtherAdjustments 6,969,000us-gaap_IncomeTaxReconciliationOtherAdjustments
Provision (benefit) for income taxes 66,850,000us-gaap_IncomeTaxExpenseBenefit 48,319,000us-gaap_IncomeTaxExpenseBenefit (1,944,000)us-gaap_IncomeTaxExpenseBenefit
Internal Revenue Service (IRS)      
Income Tax Contingency [Line Items]      
Unrecognized tax benefits, period increase (decrease)     (52,400,000)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember
Unrecognized tax benefits, income tax penalties and interest accrued     $ 29,300,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember