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Commitments and Contingencies - Schedule of Future Minimum Rental Payments under Non-Cancellable Operating Leases (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014
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Operating Leased Assets [Line Items] |
2015 | $ 250 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueWithinOneYear
2016 | 3,084 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueInSecondYear
2017 | 826 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueInThirdYear
2018 | 42 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueInFourthYear
2019 | 26 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueInFifthYear
Thereafter | 793 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueAfterFifthYear
Total | 5,021 us-gaap_AccrualForEnvironmentalLossContingenciesGross
Operating Leases [Member] |
Operating Leased Assets [Line Items] |
2015 | 13,169 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / us-gaap_LongtermDebtTypeAxis = cwst_OperatingLeaseObligationMember
2016 | 12,899 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / us-gaap_LongtermDebtTypeAxis = cwst_OperatingLeaseObligationMember
2017 | 12,448 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / us-gaap_LongtermDebtTypeAxis = cwst_OperatingLeaseObligationMember
2018 | 13,516 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears / us-gaap_LongtermDebtTypeAxis = cwst_OperatingLeaseObligationMember
2019 | 12,490 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears / us-gaap_LongtermDebtTypeAxis = cwst_OperatingLeaseObligationMember
Thereafter | 117,608 us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter / us-gaap_LongtermDebtTypeAxis = cwst_OperatingLeaseObligationMember
Total minimum lease payments | $ 182,130 us-gaap_OperatingLeasesFutureMinimumPaymentsDue / us-gaap_LongtermDebtTypeAxis = cwst_OperatingLeaseObligationMember

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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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