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Segment Reporting - Summary of Revenue Attributable to Services Provided by Company (Detail) (USD $) In Thousands, unless otherwise specified | 2 Months Ended | 3 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2014 | Oct. 31, 2014 | Jul. 31, 2014 | Apr. 30, 2014 | Jan. 31, 2014 | Oct. 31, 2013 | Jul. 31, 2013 | Apr. 30, 2013 | Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2012 | Oct. 31, 2011 | Jul. 31, 2011 | Dec. 31, 2014 | Dec. 31, 2013 | Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 85,646 us-gaap_Revenues | $ 141,341 us-gaap_Revenues | $ 141,387 us-gaap_Revenues | $ 118,927 us-gaap_Revenues | $ 117,852 us-gaap_Revenues | $ 132,296 us-gaap_Revenues | $ 128,558 us-gaap_Revenues | $ 108,694 us-gaap_Revenues | $ 112,167 us-gaap_Revenues | $ 116,836 us-gaap_Revenues | $ 117,638 us-gaap_Revenues | $ 106,375 us-gaap_Revenues | $ 111,520 us-gaap_Revenues | $ 125,989 us-gaap_Revenues | $ 124,066 us-gaap_Revenues | $ 368,374 us-gaap_Revenues | $ 340,069 us-gaap_Revenues | $ 497,633 us-gaap_Revenues | $ 455,335 us-gaap_Revenues | $ 467,950 us-gaap_Revenues
Revenues percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%us-gaap_ConcentrationRiskPercentage1 |  | 100.00%us-gaap_ConcentrationRiskPercentage1 | 100.00%us-gaap_ConcentrationRiskPercentage1 | 100.00%us-gaap_ConcentrationRiskPercentage1
Solid Waste Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 271,805 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember |  | 372,583 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember | 342,277 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember | 346,582 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember
Solid Waste Operations [Member] | Sales Revenue, Product Line [Member] | Product Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 73.80%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember |  | 74.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember | 75.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember | 74.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember
Solid Waste Operations [Member] | Collection [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 157,809 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_CollectionMember |  | 225,441 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_CollectionMember | 208,973 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_CollectionMember | 205,296 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_CollectionMember
Solid Waste Operations [Member] | Collection [Member] | Sales Revenue, Product Line [Member] | Product Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42.80%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_CollectionMember |  | 45.30%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_CollectionMember | 45.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_CollectionMember | 43.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_CollectionMember
Solid Waste Operations [Member] | Disposal [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 102,304 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_DisposalMember |  | 128,778 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_DisposalMember | 115,049 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_DisposalMember | 123,620 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_DisposalMember
Solid Waste Operations [Member] | Disposal [Member] | Sales Revenue, Product Line [Member] | Product Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27.80%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_DisposalMember |  | 25.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_DisposalMember | 25.30%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_DisposalMember | 26.40%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_DisposalMember
Solid Waste Operations [Member] | Power Generation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,049 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_PowerGenerationMember |  | 9,512 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_PowerGenerationMember | 11,354 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_PowerGenerationMember | 11,894 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_PowerGenerationMember
Solid Waste Operations [Member] | Power Generation [Member] | Sales Revenue, Product Line [Member] | Product Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.40%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_PowerGenerationMember |  | 1.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_PowerGenerationMember | 2.40%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_PowerGenerationMember | 2.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_PowerGenerationMember
Solid Waste Operations [Member] | Processing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,643 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_ProcessingMember |  | 8,852 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_ProcessingMember | 6,901 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_ProcessingMember | 5,772 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_ProcessingMember
Solid Waste Operations [Member] | Processing [Member] | Sales Revenue, Product Line [Member] | Product Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.80%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_ProcessingMember |  | 1.80%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_ProcessingMember | 1.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_ProcessingMember | 1.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_SolidWasteOperationsMember / us-gaap_SubsegmentsAxis = cwst_ProcessingMember
Organics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,012 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_OrganicsMember |  | 37,829 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_OrganicsMember | 35,330 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_OrganicsMember | 30,871 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_OrganicsMember
Organics [Member] | Sales Revenue, Product Line [Member] | Product Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.30%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_OrganicsMember |  | 7.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_OrganicsMember | 7.80%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_OrganicsMember | 6.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_OrganicsMember
Customer Solutions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,816 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_CustomerSolutionsMember |  | 43,396 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_CustomerSolutionsMember | 35,455 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_CustomerSolutionsMember | 38,302 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_CustomerSolutionsMember
Customer Solutions [Member] | Sales Revenue, Product Line [Member] | Product Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.70%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_CustomerSolutionsMember |  | 8.70%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_CustomerSolutionsMember | 7.80%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_CustomerSolutionsMember | 8.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_CustomerSolutionsMember
Recycling [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33,741 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember |  | $ 43,825 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember | $ 42,273 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember | $ 52,195 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember
Recycling [Member] | Sales Revenue, Product Line [Member] | Product Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember |  | 8.80%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember | 9.30%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember | 11.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember

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