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Net Income Per Share Information (Basic and Diluted Net Income Per Common Share) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Numerator:        
Net income attributable to Waste Connections for basic and diluted earnings per share $ 159,109 $ 150,843 $ 433,579 $ 414,393
Denominator:        
Basic shares outstanding 263,853,681 263,628,838 263,768,258 263,657,274
Dilutive effect of equity-based awards 733,775 765,919 705,087 719,046
Diluted shares outstanding 264,587,456 264,394,757 264,473,345 264,376,320