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Long-Term Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended
	Feb. 28, 2015	Mar. 31, 2015
Debt Instrument [Line Items]
Cash payment for settlement of interest rate derivative	$ 830cwst_SettlementOfDerivativeNotDesignatedAsHedgingInstrument
Loss on debt extinguishment		(521)us-gaap_GainsLossesOnExtinguishmentOfDebt
Write off Deferred Financing Costs [Member]
Debt Instrument [Line Items]
Loss on debt extinguishment		521us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_ExtinguishmentOfDebtAxis = cwst_WriteOffDeferredFinancingCostsMember
Senior Subordinated Notes Due 2019 Notes [Member]
Debt Instrument [Line Items]
Maturity date	Feb. 15, 2019
Debt instrument stated percentage	7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / cwst_DebtMaturityPrincipalPaymentEntityAxis = cwst_SeniorSubordinatedNotesDueTwoThousandNineteenMember
Issued discount	476us-gaap_DebtInstrumentUnamortizedDiscount / cwst_DebtMaturityPrincipalPaymentEntityAxis = cwst_SeniorSubordinatedNotesDueTwoThousandNineteenMember
Senior Secured Revolving Credit Facility Due 2016 [Member]
Debt Instrument [Line Items]
Maturity date	Mar. 18, 2016
Senior Secured Revolving Credit Facility Due Two Thousand Twenty [Member] | Abl Facility [Member]
Debt Instrument [Line Items]
Maturity date		Feb. 26, 2020
Revolving credit facility		190,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = cwst_AblFacilityMember / us-gaap_LongtermDebtTypeAxis = cwst_SeniorSecuredRevolvingCreditFacilityDueTwoThousandTwentyMember
Additional increase in credit facility		100,000cwst_AdditionalRevolverCapacity / us-gaap_DebtInstrumentAxis = cwst_AblFacilityMember / us-gaap_LongtermDebtTypeAxis = cwst_SeniorSecuredRevolvingCreditFacilityDueTwoThousandTwentyMember
Line of credit facility interest rate description		LIBOR plus between 1.75% and 2.50%
Debt instrument stated percentage		2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cwst_AblFacilityMember / us-gaap_LongtermDebtTypeAxis = cwst_SeniorSecuredRevolvingCreditFacilityDueTwoThousandTwentyMember
Maturity date description		The ABL Facility matures on February 26, 2020. If we fail to refinance the 2019 Notes on or before November 16, 2018, the maturity date for the ABL Facility shall be November 16, 2018
Senior Secured Revolving Credit Facility Due Two Thousand Twenty [Member] | Abl Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt instrument stated percentage		1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cwst_AblFacilityMember / us-gaap_LongtermDebtTypeAxis = cwst_SeniorSecuredRevolvingCreditFacilityDueTwoThousandTwentyMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Senior Secured Revolving Credit Facility Due Two Thousand Twenty [Member] | Abl Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument stated percentage		2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cwst_AblFacilityMember / us-gaap_LongtermDebtTypeAxis = cwst_SeniorSecuredRevolvingCreditFacilityDueTwoThousandTwentyMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Original Issuance of Senior Subordinated Notes [Member] | Senior Subordinated Notes Due 2019 Notes [Member]
Debt Instrument [Line Items]
Issuance of senior subordinated notes, face amount	325,000us-gaap_DebtInstrumentFaceAmount / cwst_DebtMaturityPrincipalPaymentEntityAxis = cwst_SeniorSubordinatedNotesDueTwoThousandNineteenMember / us-gaap_LongtermDebtTypeAxis = cwst_OriginalIssuanceOfSeniorSubordinatedNotesMember
Subsequent Issuance of Senior Subordinated Notes [Member] | Senior Subordinated Notes Due 2019 Notes [Member]
Debt Instrument [Line Items]
Issuance of senior subordinated notes, face amount	$ 60,000us-gaap_DebtInstrumentFaceAmount / cwst_DebtMaturityPrincipalPaymentEntityAxis = cwst_SeniorSubordinatedNotesDueTwoThousandNineteenMember / us-gaap_LongtermDebtTypeAxis = cwst_SubsequentIssuanceOfSeniorSubordinatedNotesMember

X

- Definition

Amount of additional optional borrowing capacity under the credit facility.

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Definition

Cash outflow associated with the settlement of an interest rate swap not designated as an effective hedge.

+ References

No definition available.

+ Details

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X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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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))

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X

- Definition

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

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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X

- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Article 5



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

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- Definition

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

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X

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Paragraph 28

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X

- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

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-Topic 210

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-Number 210

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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-Publisher FASB

-Name Accounting Standards Codification

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