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Stockholders' Equity (Common Stock Shares Reserved for Issuances) (Detail)
Dec. 31, 2014
Class Of Stock [Line Items]  
Shares reserved for issuance 4,788,683us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Stock Option, Restricted Stock Unit, and Warrants Plans [Member]  
Class Of Stock [Line Items]  
Shares reserved for issuance 1,655,659us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_AwardTypeAxis
= wcn_StockOptionRestrictedStockUnitAndWarrantsPlansMember
2014 Incentive Award Plan [Member]  
Class Of Stock [Line Items]  
Shares reserved for issuance 3,133,024us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_AwardTypeAxis
= wcn_TwoThousandFourteenIncentiveAwardPlanMember