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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Statement [Abstract]    
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
Divestiture transactions (4,935)cwst_DivestitureTransactions  
Development project charge   1,440us-gaap_NoncashProjectAbandonmentCosts
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):    
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  
Loss on derivative instruments 151us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet 150us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Income from equity method investments   (27)us-gaap_IncomeLossFromEquityMethodInvestments
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
Loss before income taxes (7,367)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (13,307)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes 596us-gaap_IncomeTaxExpenseBenefit 303us-gaap_IncomeTaxExpenseBenefit
Net 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 loss attributable to common stockholders $ (9,271)us-gaap_NetIncomeLoss $ (13,423)us-gaap_NetIncomeLoss
Basic and diluted earnings per share attributable to common stockholders:    
Weighted average common shares outstanding 40,417us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 39,909us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Basic and diluted earnings per common share $ (0.23)us-gaap_EarningsPerShareBasicAndDiluted $ (0.34)us-gaap_EarningsPerShareBasicAndDiluted