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Long-Term Debt and Capital Leases - Components of Long-Term Debt and Capital Leases (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	8 Months Ended
	Dec. 31, 2014	Apr. 30, 2014	Apr. 30, 2013
Senior Secured Revolving Credit Facility, Due 2016 [Member]
Debt Instrument [Line Items]
Debt instrument, due date	Mar. 18, 2016
Debt instrument stated percentage	3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = cwst_SeniorSecuredRevolvingCreditFacilityDueTwoThousandAndSixteenMember
Revenue Bonds Series 2014 Due December 2044 [Member]
Debt Instrument [Line Items]
Debt instrument, due date	Dec. 01, 2044
Debt instrument stated percentage	3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = cwst_RevenueBondsSeriesTwoThousandFourteenDueTwoThousandFortyFourMember
Revenue Bonds Series 2005R-2, due January 2025 [Member]
Debt Instrument [Line Items]
Debt instrument, due date	Jan. 01, 2025
Debt instrument stated percentage	6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = cwst_RevenueBondsSeriesTwoThousandFiveRtwoDueTwoThousandTwentyFiveMember
Long-Term Revenue Bonds Series 2013 Due April 2036 [Member]
Debt Instrument [Line Items]
Debt instrument, due date	Apr. 01, 2036
Debt instrument stated percentage	4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = cwst_LongTermRevenueBondSeriesTwoThousandThirteenDueTwoThousandThirtySixMember
Revenue Bonds Series 2013 Due April 2029 [Member]
Debt Instrument [Line Items]
Debt instrument, due date	Apr. 01, 2029
Debt instrument stated percentage	4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = cwst_RevenueBondSeriesTwoThousandThirteenDueTwoThousandTwentyNineMember
Revenue Bonds Series, 2005R-1, Due January 2025 [Member]
Debt Instrument [Line Items]
Debt instrument, due date	Jan. 01, 2025
Revenue Bonds Series 2013 Due April 2029 [Member]
Debt Instrument [Line Items]
Debt instrument, due date	Apr. 01, 2029
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Debt instrument maturity date	Apr. 01, 2023
Debt instrument stated percentage	7.70%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember
Notes Payable [Member]
Debt Instrument [Line Items]
Debt instrument maturity date	Apr. 01, 2017
Debt instrument stated percentage	6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = cwst_NotesPayableMember
Senior Subordinated Notes Due 2019 Notes [Member]
Debt Instrument [Line Items]
Debt instrument, due date	Feb. 15, 2019
Debt instrument stated percentage	7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = cwst_SeniorSubordinatedNotesDueTwoThousandNineteenMember
Senior second lien notes, unamortized discount	$ 1,319us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = cwst_SeniorSubordinatedNotesDueTwoThousandNineteenMember	$ 1,491us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = cwst_SeniorSubordinatedNotesDueTwoThousandNineteenMember	$ 1,735us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = cwst_SeniorSubordinatedNotesDueTwoThousandNineteenMember

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: 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(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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X

- Details

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Period Type:	duration

X

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: 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(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: 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(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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X

- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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