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Subsidiary Guarantors - Schedule of Consolidating Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 116,577us-gaap_Revenues	$ 113,197us-gaap_Revenues
Operating expenses:
Cost of operations	87,833us-gaap_CostOfGoodsAndServicesSold	86,404us-gaap_CostOfGoodsAndServicesSold
General and administration	16,805us-gaap_GeneralAndAdministrativeExpense	16,387us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization	13,748us-gaap_DepreciationDepletionAndAmortization	13,608us-gaap_DepreciationDepletionAndAmortization
Development project charge		1,440us-gaap_NoncashProjectAbandonmentCosts
Divestiture transactions	(4,935)cwst_DivestitureTransactions
Severance and reorganization costs		80us-gaap_SeveranceCosts1
Expense from divestiture, acquisition and financing costs		10cwst_DivestitureAcquisitionFinancingCosts
Gain on settlement of acquisition related contingent consideration		(1,058)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Total operating expenses	113,451us-gaap_CostsAndExpenses	116,871us-gaap_CostsAndExpenses
Operating income (loss)	3,126us-gaap_OperatingIncomeLoss	(3,674)us-gaap_OperatingIncomeLoss
Other expense (income), net:
Interest income	(141)us-gaap_InterestIncomeOther	(110)us-gaap_InterestIncomeOther
Interest expense	10,126us-gaap_InterestExpense	9,606us-gaap_InterestExpense
Loss on debt extinguishment	521us-gaap_GainsLossesOnExtinguishmentOfDebt
(Income) loss on derivative instruments	151us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	150us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
(Income) loss from equity method investments		(27)cwst_IncomeFromEquityMethodInvestments
(Gain) loss on sale of equity method investment		221us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
Other income	(164)us-gaap_OtherNonoperatingIncome	(207)us-gaap_OtherNonoperatingIncome
Other expense (income), net	10,493us-gaap_NonoperatingIncomeExpense	9,633us-gaap_NonoperatingIncomeExpense
Income (loss) before income taxes	(7,367)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	(13,307)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision (benefit) for income taxes	596us-gaap_IncomeTaxExpenseBenefit	303us-gaap_IncomeTaxExpenseBenefit
Net income (loss)	(7,963)us-gaap_ProfitLoss	(13,610)us-gaap_ProfitLoss
Less: Net income (loss) attributable to noncontrolling interests	1,308us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	(187)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income (loss) attributable to common stockholders	(9,271)us-gaap_NetIncomeLoss	(13,423)us-gaap_NetIncomeLoss
Parent [Member]
Operating expenses:
Cost of operations	(83)us-gaap_CostOfGoodsAndServicesSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(44)us-gaap_CostOfGoodsAndServicesSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
General and administration	(117)us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,007us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Depreciation and amortization	223us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	266us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total operating expenses	23us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,229us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating income (loss)	(23)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(1,229)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other expense (income), net:
Interest income	(47)us-gaap_InterestIncomeOther / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(2)us-gaap_InterestIncomeOther / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest expense	9,988us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	9,580us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Loss on debt extinguishment	521us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
(Income) loss on derivative instruments	151us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	150us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
(Income) loss from consolidated entities	(1,924)cwst_IncomeLossFromSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	2,173cwst_IncomeLossFromSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other income	(37)us-gaap_OtherNonoperatingIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(10)us-gaap_OtherNonoperatingIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other expense (income), net	8,652us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	11,891us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income (loss) before income taxes	(8,675)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(13,120)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Provision (benefit) for income taxes	596us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	303us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income (loss)	(9,271)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(13,423)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income (loss) attributable to common stockholders	(9,271)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(13,423)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	116,453us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	112,933us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Operating expenses:
Cost of operations	87,679us-gaap_CostOfGoodsAndServicesSold / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	86,002us-gaap_CostOfGoodsAndServicesSold / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
General and administration	16,938us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	15,375us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Depreciation and amortization	13,525us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	13,146us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Development project charge		1,440us-gaap_NoncashProjectAbandonmentCosts / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Divestiture transactions	(2,085)cwst_DivestitureTransactions / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Severance and reorganization costs		80us-gaap_SeveranceCosts1 / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Expense from divestiture, acquisition and financing costs		10cwst_DivestitureAcquisitionFinancingCosts / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Gain on settlement of acquisition related contingent consideration		(1,058)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Total operating expenses	116,057us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	114,995us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Operating income (loss)	396us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	(2,062)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Other expense (income), net:
Interest income	(94)us-gaap_InterestIncomeOther / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	(108)us-gaap_InterestIncomeOther / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Interest expense	53us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	26us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
(Income) loss from equity method investments		(27)cwst_IncomeFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Other income	(127)us-gaap_OtherNonoperatingIncome / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	(197)us-gaap_OtherNonoperatingIncome / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Other expense (income), net	(168)us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	(306)us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Income (loss) before income taxes	564us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	(1,756)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net income (loss)	564us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	(1,756)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net income (loss) attributable to common stockholders	564us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	(1,756)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	124us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember	264us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Operating expenses:
Cost of operations	237us-gaap_CostOfGoodsAndServicesSold / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember	446us-gaap_CostOfGoodsAndServicesSold / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
General and administration	(16)us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember	5us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Depreciation and amortization		196us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Divestiture transactions	(2,850)cwst_DivestitureTransactions / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Total operating expenses	(2,629)us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember	647us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Operating income (loss)	2,753us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember	(383)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Other expense (income), net:
Interest expense	85us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
(Gain) loss on sale of equity method investment		221us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Other expense (income), net	85us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember	221us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Income (loss) before income taxes	2,668us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember	(604)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net income (loss)	2,668us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember	(604)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Less: Net income (loss) attributable to noncontrolling interests	1,308us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember	(187)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net income (loss) attributable to common stockholders	1,360us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember	(417)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Elimination [Member]
Other expense (income), net:
(Income) loss from consolidated entities	1,924cwst_IncomeLossFromSubsidiaries / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember	(2,173)cwst_IncomeLossFromSubsidiaries / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Other expense (income), net	1,924us-gaap_NonoperatingIncomeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember	(2,173)us-gaap_NonoperatingIncomeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Income (loss) before income taxes	(1,924)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember	2,173us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Net income (loss)	(1,924)us-gaap_ProfitLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember	2,173us-gaap_ProfitLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Net income (loss) attributable to common stockholders	$ (1,924)us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember	$ 2,173us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember

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