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Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 8 Months Ended | 12 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 Executives | Dec. 31, 2013 | Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012 | Jul. 31, 2014 | Apr. 30, 2011 | May 31, 2009 | Sep. 30, 2011 | Nov. 30, 2011
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Total rent expense under operating leases charged to operations | $ 4,868 us-gaap_OperatingLeasesRentExpenseNet |  | $ 5,651 us-gaap_OperatingLeasesRentExpenseNet | $ 5,372 us-gaap_OperatingLeasesRentExpenseNet | $ 5,213 us-gaap_OperatingLeasesRentExpenseNet |  |  |  |  |
Litigation settlement |  |  |  |  | (1,359)us-gaap_LitigationSettlementAmount |  |  |  |  |
Environmental remediation charge | 950 us-gaap_EnvironmentalRemediationExpense | 400 us-gaap_EnvironmentalRemediationExpense | 400 us-gaap_EnvironmentalRemediationExpense |  |  |  |  |  |  |
Loss contingency range of possible loss maximum | 1,350 us-gaap_LossContingencyRangeOfPossibleLossMaximum |  |  |  |  |  |  |  |  |
Number of executive officers | 4 cwst_EmploymentContractsExecutiveOfficers |  |  |  |  |  |  |  |  |
Contract extension period | 1 year |  |  |  |  |  |  |  |  |
Total annual commitments for salaries | 1,397 cwst_CommitmentAmountUnderEmploymentAgreement |  |  |  |  |  |  |  |  |
New York Attorney General Matter [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Litigation settlement | 100 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = cwst_NewYorkAttorneyGeneralMatterMember |  |  |  |  |  |  |  |  |
Greenwood Street Landfill [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Litigation settlement | 67 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = cwst_GreenwoodStreetLandfillMember |  |  |  |  |  |  |  |  |
Greenwood Street Landfill [Member] | Administrative Penalty [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Litigation settlement | 201 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = cwst_GreenwoodStreetLandfillMember / us-gaap_OtherCommitmentsAxis = cwst_AdministrativePenaltyMember |  |  |  |  |  |  |  |  |
MAAG [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Litigation settlement | 200 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = cwst_MassachusettsOfficeOfTheAttorneyGeneralMember |  |  |  |  |  |  |  |  |
Southbridge Landfill [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Loss contingency charged against pending satisfactory completion of remediation | 50 cwst_LossContingencyChargedAgainstPendingSatisfactoryCompletionOfRemediation / us-gaap_LitigationCaseAxis = cwst_SouthbridgeLandfillMember |  |  |  |  |  |  |  |  |
Charlton [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Litigation settlement | 20 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = cwst_CharltonMember |  |  |  |  |  |  |  |  |
General and Administration Costs [Member] | New York Attorney General Matter [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Litigation settlement charge |  |  |  |  |  | 100 us-gaap_LitigationSettlementExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember / us-gaap_LitigationCaseAxis = cwst_NewYorkAttorneyGeneralMatterMember |  |  |  |
General and Administration Costs [Member] | Greenwood Street Landfill [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Litigation settlement charge | 172 us-gaap_LitigationSettlementExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember / us-gaap_LitigationCaseAxis = cwst_GreenwoodStreetLandfillMember |  |  |  |  |  |  |  |  |
CCI [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from anticipated remediation | 740 cwst_RemediationSettlement / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cwst_CasellaConstructionIncMember |  |  |  |  |  |  |  |  |
GCI [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from anticipated remediation | 1,300 cwst_RemediationSettlement / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cwst_GeosyntecConsultantsIncMember |  |  |  |  |  |  |  |  |
Steadfast [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from anticipated remediation | 177 cwst_RemediationSettlement / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cwst_SteadfastInsuranceCompanyMember |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Initial term of employment contract | 1 year |  |  |  |  |  |  |  |  |
Intangible assets, useful life | 5 years |  |  |  |  |  |  |  |  |
Salary and bonuses payment range | 1 year |  |  |  |  |  |  |  |  |
Minimum [Member] | Employment Contracts [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets, useful life | 1 year |  |  |  |  |  |  |  |  |
Minimum [Member] | New York Attorney General Matter [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Minimum acquisition value for post acquisition notice | 350 cwst_LitigationSettlementAcquisitionNotification / us-gaap_LitigationCaseAxis = cwst_NewYorkAttorneyGeneralMatterMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Operating facilities and equipment under operating leases | 50 us-gaap_PaymentsForRent / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |
Initial term of employment contract | 3 years |  |  |  |  |  |  |  |  |
Intangible assets, useful life | 10 years |  |  |  |  |  |  |  |  |
Salary and bonuses payment range | 3 years |  |  |  |  |  |  |  |  |
Maximum [Member] | Employment Contracts [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets, useful life | 2 years |  |  |  |  |  |  |  |  |
Potsdam Environmental Remediation Liability [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Scrap yard and solid waste transfer station | 25 cwst_ScrapYardAndSolidWasteTransferStation / us-gaap_EnvironmentalRemediationSiteAxis = cwst_PotsdamEnvironmentalLiabilityMember |  |  |  |  |  |  |  |  |
Estimate of total undiscounted costs associated with implementing the preferred remedies |  |  |  |  |  |  | 12,130 cwst_UndiscountedCostsPreferredRemedies / us-gaap_EnvironmentalRemediationSiteAxis = cwst_PotsdamEnvironmentalLiabilityMember | 10,219 cwst_UndiscountedCostsPreferredRemedies / us-gaap_EnvironmentalRemediationSiteAxis = cwst_PotsdamEnvironmentalLiabilityMember |  |
Risk free interest rate | 2.00%us-gaap_AccrualForEnvironmentalLossContingenciesDiscountRate / us-gaap_EnvironmentalRemediationSiteAxis = cwst_PotsdamEnvironmentalLiabilityMember |  |  |  |  |  |  |  |  |
Potsdam Environmental Remediation Liability [Member] | Waste-Stream Inc. [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Future remediation costs |  |  |  |  |  |  |  |  | 3,000 cwst_FutureRemediationCostsReimbursed / us-gaap_EnvironmentalRemediationSiteAxis = cwst_PotsdamEnvironmentalLiabilityMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = cwst_WasteStreamIncMember |
Potsdam Environmental Remediation Liability [Member] | Motors Liquidation Trust [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Future remediation costs |  |  |  |  |  |  |  |  |  | 100 cwst_FutureRemediationCostsReimbursed / us-gaap_EnvironmentalRemediationSiteAxis = cwst_PotsdamEnvironmentalLiabilityMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = cwst_MotorsLiquidationTrustMember
Southbridge Landfill [Member] | Condition One [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Environmental remediation charge | 3,337 us-gaap_EnvironmentalRemediationExpense / us-gaap_EnvironmentalRemediationSiteAxis = cwst_SouthbridgeLandfillMember / us-gaap_OtherCommitmentsAxis = cwst_ConditionOneMember |  |  |  |  |  |  |  |  |
Anticipated additional remediation cost | 230 cwst_Additionalremediationcostanticipated / us-gaap_EnvironmentalRemediationSiteAxis = cwst_SouthbridgeLandfillMember / us-gaap_OtherCommitmentsAxis = cwst_ConditionOneMember |  |  |  |  |  |  |  |  |
Anticipated remediation costs | $ 3,567 cwst_AnticipatedRemediationCost / us-gaap_EnvironmentalRemediationSiteAxis = cwst_SouthbridgeLandfillMember / us-gaap_OtherCommitmentsAxis = cwst_ConditionOneMember |  |  |  |  |  |  |  |  |

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