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Segment Reporting - Summary of Revenue Attributable to Services Provided by Company (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Revenues	$ 116,577us-gaap_Revenues	$ 113,197us-gaap_Revenues
Solid Waste Operations [Member]
Segment Reporting Information [Line Items]
Revenues	84,261us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember	81,675us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember
Solid Waste Operations [Member] | Collection [Member]
Segment Reporting Information [Line Items]
Revenues	53,456us-gaap_Revenues / us-gaap_ProductOrServiceAxis = cwst_CollectionMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember	52,543us-gaap_Revenues / us-gaap_ProductOrServiceAxis = cwst_CollectionMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember
Solid Waste Operations [Member] | Disposal [Member]
Segment Reporting Information [Line Items]
Revenues	27,637us-gaap_Revenues / us-gaap_ProductOrServiceAxis = cwst_DisposalMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember	24,075us-gaap_Revenues / us-gaap_ProductOrServiceAxis = cwst_DisposalMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember
Solid Waste Operations [Member] | Power Generation [Member]
Segment Reporting Information [Line Items]
Revenues	2,047us-gaap_Revenues / us-gaap_ProductOrServiceAxis = cwst_PowerGenerationMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember	3,349us-gaap_Revenues / us-gaap_ProductOrServiceAxis = cwst_PowerGenerationMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember
Solid Waste Operations [Member] | Processing [Member]
Segment Reporting Information [Line Items]
Revenues	1,121us-gaap_Revenues / us-gaap_ProductOrServiceAxis = cwst_ProcessingMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember	1,708us-gaap_Revenues / us-gaap_ProductOrServiceAxis = cwst_ProcessingMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember
Organics [Member]
Segment Reporting Information [Line Items]
Revenues	9,020us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_OrganicsMember	9,276us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_OrganicsMember
Customer Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	13,002us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_CustomerSolutionsMember	11,885us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_CustomerSolutionsMember
Recycling [Member]
Segment Reporting Information [Line Items]
Revenues	$ 10,294us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember	$ 10,361us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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- Details

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- Details

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- Details

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- Details

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