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Long-Term Debt - Components of Long-Term Debt and Capital Leases (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Credit facility	$ 546,899us-gaap_DebtAndCapitalLeaseObligations	$ 535,711us-gaap_DebtAndCapitalLeaseObligations
Less-current maturities of long-term debt	1,457us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent	1,656us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Non current portion of long term debt and capital lease obligation	545,442us-gaap_LongTermDebtAndCapitalLeaseObligations	534,055us-gaap_LongTermDebtAndCapitalLeaseObligations
Senior Secured Asset Based Revolving Credit Facility, Due 2020 [Member]
Debt Instrument [Line Items]
Credit facility	83,120us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_SeniorSecuredAssetBasedRevolvingCreditFacilityDueTwoThousandAndTwentyMember
Senior Secured Revolving Credit Facility, Due 2016 [Member]
Debt Instrument [Line Items]
Credit facility		131,300us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_SeniorSecuredRevolvingCreditFacilityDueTwoThousandAndSixteenMember
Revenue Bonds Series 2014 Due December 2044 [Member]
Debt Instrument [Line Items]
Credit facility	25,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_RevenueBondsSeriesTwoThousandFourteenDueTwoThousandFortyFourMember	25,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_RevenueBondsSeriesTwoThousandFourteenDueTwoThousandFortyFourMember
Revenue Bonds Series 2005R-2, Due January 2025 [Member]
Debt Instrument [Line Items]
Credit facility	21,400us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_RevenueBondsSeriesTwoThousandFiveRtwoDueTwoThousandTwentyFiveMember	21,400us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_RevenueBondsSeriesTwoThousandFiveRtwoDueTwoThousandTwentyFiveMember
Long-Term Revenue Bonds Series 2013 Due April 2036 [Member]
Debt Instrument [Line Items]
Credit facility	16,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_LongTermRevenueBondSeriesTwoThousandThirteenDueTwoThousandThirtySixMember	16,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_LongTermRevenueBondSeriesTwoThousandThirteenDueTwoThousandThirtySixMember
Revenue Bonds Series 2013 Due April 2029 [Member]
Debt Instrument [Line Items]
Credit facility	11,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_RevenueBondSeriesTwoThousandThirteenDueTwoThousandTwentyNineMember	11,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_RevenueBondSeriesTwoThousandThirteenDueTwoThousandTwentyNineMember
Revenue Bonds Series, 2005R-1, Due January 2025 [Member]
Debt Instrument [Line Items]
Credit facility	3,600us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_RevenueBondsSeriesTwoThousandFiveRoneDueTwoThousandTwentyFiveMember	3,600us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_RevenueBondsSeriesTwoThousandFiveRoneDueTwoThousandTwentyFiveMember
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Credit facility	3,075us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember	3,295us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember
Notes Payable [Member]
Debt Instrument [Line Items]
Credit facility	418us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_NotesPayableMember	435us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_NotesPayableMember
Senior Subordinated Notes Due 2019 Notes [Member]
Debt Instrument [Line Items]
Credit facility	$ 383,286us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_SeniorSubordinatedNotesDueTwoThousandNineteenMember	$ 323,681us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = cwst_SeniorSubordinatedNotesDueTwoThousandNineteenMember

X

- 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

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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

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- Definition

Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

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-Subparagraph (SX 210.5-02.20)

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