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Long-Term Debt and Capital Leases - Components of Long-Term Debt and Capital Leases (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Apr. 30, 2014 | Apr. 30, 2013
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Debt Instrument [Line Items] |  |  |
Credit facility | $ 535,711 us-gaap_DebtAndCapitalLeaseObligations | $ 508,019 us-gaap_DebtAndCapitalLeaseObligations | $ 496,205 us-gaap_DebtAndCapitalLeaseObligations
Less-current maturities of long-term debt | 1,656 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent | 885 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent | 1,218 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Non current portion of long term debt and capital lease obligation | 534,055 us-gaap_LongTermDebtAndCapitalLeaseObligations | 507,134 us-gaap_LongTermDebtAndCapitalLeaseObligations | 494,987 us-gaap_LongTermDebtAndCapitalLeaseObligations
Senior Secured Revolving Credit Facility, Due 2016 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility | 131,300 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_SeniorSecuredRevolvingCreditFacilityDueTwoThousandAndSixteenMember | 133,860 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_SeniorSecuredRevolvingCreditFacilityDueTwoThousandAndSixteenMember | 123,200 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_SeniorSecuredRevolvingCreditFacilityDueTwoThousandAndSixteenMember
Revenue Bonds Series 2014 Due December 2044 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility | 25,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_RevenueBondsSeriesTwoThousandFourteenDueTwoThousandFortyFourMember |  |
Revenue Bonds Series 2005R-2, due January 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility | 21,400 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_RevenueBondsSeriesTwoThousandFiveRtwoDueTwoThousandTwentyFiveMember | 21,400 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_RevenueBondsSeriesTwoThousandFiveRtwoDueTwoThousandTwentyFiveMember | 21,400 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_RevenueBondsSeriesTwoThousandFiveRtwoDueTwoThousandTwentyFiveMember
Long-Term Revenue Bonds Series 2013 Due April 2036 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility | 16,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_LongTermRevenueBondSeriesTwoThousandThirteenDueTwoThousandThirtySixMember | 16,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_LongTermRevenueBondSeriesTwoThousandThirteenDueTwoThousandThirtySixMember | 16,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_LongTermRevenueBondSeriesTwoThousandThirteenDueTwoThousandThirtySixMember
Revenue Bonds Series 2013 Due April 2029 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility | 11,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_RevenueBondSeriesTwoThousandThirteenDueTwoThousandTwentyNineMember |  |
Revenue Bonds Series, 2005R-1, Due January 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility | 3,600 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_RevenueBondsSeriesTwoThousandFiveRoneDueTwoThousandTwentyFiveMember | 3,600 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_RevenueBondsSeriesTwoThousandFiveRoneDueTwoThousandTwentyFiveMember | 3,600 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_RevenueBondsSeriesTwoThousandFiveRoneDueTwoThousandTwentyFiveMember
Revenue Bonds Series 2013 Due April 2029 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility |  | 5,500 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_LongTermRevenueBondSeriesTwoThousandThirteenDueTwoThousandTwentyNineMember | 5,500 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_LongTermRevenueBondSeriesTwoThousandThirteenDueTwoThousandTwentyNineMember
Capital Lease Obligations [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility | 3,295 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember | 3,710 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember | 2,012 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember
Notes Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility | 435 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_NotesPayableMember | 440 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_NotesPayableMember | 1,228 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_NotesPayableMember
Senior Subordinated Notes Due 2019 Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility | $ 323,681 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_SeniorSubordinatedNotesDueTwoThousandNineteenMember | $ 323,509 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_SeniorSubordinatedNotesDueTwoThousandNineteenMember | $ 323,265 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_SeniorSubordinatedNotesDueTwoThousandNineteenMember

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H + Details
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