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Net Income Per Share Information (Narrative) (Detail) (Stock Options and Warrants [Member])
3 Months Ended
Mar. 31, 2015
Stock Options and Warrants [Member]
 
Computation Of Earnings Per Share Line Items  
Antidilutive securities excluded from computation of earnings per share 50,898us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= wcn_StockOptionsAndWarrantsMember