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Stockholders' (Deficit) Equity - Summary of Restricted Stock, Restricted Stock Unit and Performance Stock Unit Activity (Parenthetical) (Detail) (Performance Stock Units [Member]) In Thousands, unless otherwise specified | 8 Months Ended
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Dec. 31, 2014
Performance Stock Units [Member] |
Schedule Of Restricted Stock Restricted Stock Unit And Performance Stock Unit Activity [Line Items] |
Performance stock units, percentage of attainment level | 100.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_StatementClassOfStockAxis = cwst_PerformanceShareUnitsMember
Performance stock units, Maturity date | Apr. 30, 2015
Performance stock units | 250 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_StatementClassOfStockAxis = cwst_PerformanceShareUnitsMember
Common stock additional issue | 250 cwst_AdditionalSharesIssuedMaximumAttainmentLevel / us-gaap_StatementClassOfStockAxis = cwst_PerformanceShareUnitsMember

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- Definition Additional shares of Class A Common Stock that could be issued if maximum attainment levels are met. + References No definition available. + Details
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- Details
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Namespace Prefix: | cwst_
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Balance Type: | na
Period Type: | duration

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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Period Type: | instant

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- Definition Date the equity-based award expires, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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