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Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified | 8 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012
Income Statement [Abstract] |  |  |  |
Revenues | $ 340,069 us-gaap_Revenues | $ 497,633 us-gaap_Revenues | $ 455,335 us-gaap_Revenues | $ 467,950 us-gaap_Revenues
Operating expenses: |  |  |  |
Cost of operations | 236,076 us-gaap_CostOfGoodsAndServicesSold | 354,592 us-gaap_CostOfGoodsAndServicesSold | 323,014 us-gaap_CostOfGoodsAndServicesSold | 318,068 us-gaap_CostOfGoodsAndServicesSold
General and administration | 40,803 us-gaap_GeneralAndAdministrativeExpense | 61,865 us-gaap_GeneralAndAdministrativeExpense | 58,205 us-gaap_GeneralAndAdministrativeExpense | 60,264 us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization | 40,618 us-gaap_DepreciationDepletionAndAmortization | 60,339 us-gaap_DepreciationDepletionAndAmortization | 56,576 us-gaap_DepreciationDepletionAndAmortization | 58,415 us-gaap_DepreciationDepletionAndAmortization
Environmental remediation charge | 400 us-gaap_EnvironmentalRemediationExpense | 400 us-gaap_EnvironmentalRemediationExpense |  |
(Gain) expense from divestiture, acquisition and financing costs | 120 cwst_DivestitureAcquisitionFinancingCosts | 144 cwst_DivestitureAcquisitionFinancingCosts | 1,410 cwst_DivestitureAcquisitionFinancingCosts |
Asset impairment charge |  | 7,455 us-gaap_AssetImpairmentCharges |  | 40,746 us-gaap_AssetImpairmentCharges
Development project charge |  | 1,394 cwst_AbandonedDevelopmentProjectExpense |  | 131 cwst_AbandonedDevelopmentProjectExpense
Severance and reorganization costs | 161 us-gaap_SeveranceCosts1 | 586 us-gaap_SeveranceCosts1 | 3,709 us-gaap_SeveranceCosts1 |
Gain on settlement of acquisition related contingent consideration |  | (1,058)cwst_GainLossOnSettlementOfContingentConsideration |  |
Legal settlement |  |  |  | 1,359 us-gaap_LitigationSettlementAmount
Total operating expenses | 318,178 us-gaap_CostsAndExpenses | 485,717 us-gaap_CostsAndExpenses | 442,914 us-gaap_CostsAndExpenses | 478,983 us-gaap_CostsAndExpenses
Operating income (loss) | 21,891 us-gaap_OperatingIncomeLoss | 11,916 us-gaap_OperatingIncomeLoss | 12,421 us-gaap_OperatingIncomeLoss | (11,033)us-gaap_OperatingIncomeLoss
Other expense (income): |  |  |  |
Interest income | (184)us-gaap_InterestIncomeOther | (312)us-gaap_InterestIncomeOther | (141)us-gaap_InterestIncomeOther | (42)us-gaap_InterestIncomeOther
Interest expense | 25,357 us-gaap_InterestExpense | 38,175 us-gaap_InterestExpense | 41,570 us-gaap_InterestExpense | 45,008 us-gaap_InterestExpense
Loss from equity method investments | 1,027 us-gaap_IncomeLossFromEquityMethodInvestments | 936 us-gaap_IncomeLossFromEquityMethodInvestments | 4,441 us-gaap_IncomeLossFromEquityMethodInvestments | 9,994 us-gaap_IncomeLossFromEquityMethodInvestments
Gain on sale of equity method investment | (815)us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal | (593)us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal |  |
Impairment of investments |  |  |  | 10,680 us-gaap_ImpairmentOfInvestments
(Gain) loss on derivative instruments | (69)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | 280 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | 4,512 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet |
Loss on debt extinguishment |  |  | 15,584 us-gaap_GainsLossesOnExtinguishmentOfDebt | 300 us-gaap_GainsLossesOnExtinguishmentOfDebt
Other income | (603)us-gaap_OtherNonoperatingIncome | (1,059)us-gaap_OtherNonoperatingIncome | (1,036)us-gaap_OtherNonoperatingIncome | (863)us-gaap_OtherNonoperatingIncome
Other expense, net | 24,713 us-gaap_NonoperatingIncomeExpense | 37,427 us-gaap_NonoperatingIncomeExpense | 64,930 us-gaap_NonoperatingIncomeExpense | 65,077 us-gaap_NonoperatingIncomeExpense
Loss from continuing operations before income taxes and discontinued operations | (2,822)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (25,511)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (52,509)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (76,110)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision (benefit) for income taxes | 1,162 us-gaap_IncomeTaxExpenseBenefit | 1,799 us-gaap_IncomeTaxExpenseBenefit | (2,526)us-gaap_IncomeTaxExpenseBenefit | 1,593 us-gaap_IncomeTaxExpenseBenefit
Loss from continuing operations before discontinued operations | (3,984)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | (27,310)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | (49,983)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | (77,703)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Discontinued operations: |  |  |  |
Income (loss) from discontinued operations (net of income tax benefit of $0, $0, $0, $0 and $412, respectively) | 284 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 284 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | (4,480)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | (614)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
(Loss) gain on disposal of discontinued operations (net of income tax provision of $0, $0, $0, $0 and $489, respectively) | (378)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | (378)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  | 725 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Net loss | (4,078)us-gaap_ProfitLoss | (27,404)us-gaap_ProfitLoss | (54,463)us-gaap_ProfitLoss | (77,592)us-gaap_ProfitLoss
Less: Net income (loss) attributable to noncontrolling interests | (355)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (4,309)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (321)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (6)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net loss | (3,723)us-gaap_NetIncomeLoss | (23,095)us-gaap_NetIncomeLoss | (54,142)us-gaap_NetIncomeLoss | (77,586)us-gaap_NetIncomeLoss
Net loss attributable to common stockholders: |  |  |  |
Continuing operations, net of tax | (3,629)us-gaap_IncomeLossFromContinuingOperations | (23,001)us-gaap_IncomeLossFromContinuingOperations | (49,662)us-gaap_IncomeLossFromContinuingOperations | (77,697)us-gaap_IncomeLossFromContinuingOperations
Discontinued operations, net of tax | (94)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (94)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (4,480)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 111 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net loss | $ (3,723)us-gaap_NetIncomeLoss | $ (23,095)us-gaap_NetIncomeLoss | $ (54,142)us-gaap_NetIncomeLoss | $ (77,586)us-gaap_NetIncomeLoss
Weighted average common shares outstanding: |  |  |  |
Basic and diluted | 39,774 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 39,820 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 34,015 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 26,749 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Basic and diluted earnings per share: |  |  |  |
Continuing operations, net of tax | $ (0.09)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.58)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (1.46)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (2.90)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare
Discontinued operations, net of tax | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ (0.13)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare
Net loss per common share | $ (0.09)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.58)us-gaap_EarningsPerShareBasicAndDiluted | $ (1.59)us-gaap_EarningsPerShareBasicAndDiluted | $ (2.90)us-gaap_EarningsPerShareBasicAndDiluted

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