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Income Taxes - Schedule of Provision (Benefit) for Income Taxes Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified	8 Months Ended		12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Federal-
Current	$ 2,231us-gaap_CurrentFederalTaxExpenseBenefit				$ 121us-gaap_CurrentFederalTaxExpenseBenefit
Current benefit of loss carryforwards	(2,231)cwst_CurrentFederalDeferredBenefitLossCarryforwards
Deferred	463us-gaap_DeferredFederalIncomeTaxExpenseBenefit		1,262us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(2,827)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	1,468us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Total	463us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations		1,262us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations	(2,827)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations	1,589us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
State-
Current	500us-gaap_CurrentStateAndLocalTaxExpenseBenefit		219us-gaap_CurrentStateAndLocalTaxExpenseBenefit	1,040us-gaap_CurrentStateAndLocalTaxExpenseBenefit	(352)us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current benefit of loss carryforwards	(402)cwst_CurrentStateDeferredBenefitLossCarryforwards			(22)cwst_CurrentStateDeferredBenefitLossCarryforwards
Deferred	142us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit		318us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	(717)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	372us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred benefit of loss carryforwards					(16)cwst_DeferredTaxAssetsStateNetOperatingLossCarryForwards
Total	240us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations		537us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	301us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	4us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Income before provision (benefit) for income tax, net	$ 703us-gaap_IncomeTaxExpenseBenefit	$ 1,162us-gaap_IncomeTaxExpenseBenefit	$ 1,799us-gaap_IncomeTaxExpenseBenefit	$ (2,526)us-gaap_IncomeTaxExpenseBenefit	$ 1,593us-gaap_IncomeTaxExpenseBenefit

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The component of deferred income tax expense for the period comprised of the increase (decrease) in the entity's state and local deferred tax assets and liabilities attributable to continuing operations as a result of loss carryforwards.

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Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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