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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
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Mar. 31, 2015 | Mar. 31, 2014
Segment Reporting Information [Line Items] |  |
Revenues | $ 116,577 us-gaap_Revenues | $ 113,197 us-gaap_Revenues
Solid Waste Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 84,261 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember | 81,675 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember
Solid Waste Operations [Member] | Collection [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 53,456 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = cwst_CollectionMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember | 52,543 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = cwst_CollectionMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember
Solid Waste Operations [Member] | Disposal [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 27,637 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = cwst_DisposalMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember | 24,075 us-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 | 2,047 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = cwst_PowerGenerationMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember | 3,349 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = cwst_PowerGenerationMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember
Solid Waste Operations [Member] | Processing [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 1,121 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = cwst_ProcessingMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember | 1,708 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = cwst_ProcessingMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember
Organics [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 9,020 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_OrganicsMember | 9,276 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_OrganicsMember
Customer Solutions [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 13,002 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_CustomerSolutionsMember | 11,885 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_CustomerSolutionsMember
Recycling [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | $ 10,294 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember | $ 10,361 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember

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- 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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