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Net Income Per Share Information (Basic and Diluted Net Income Per Common Share) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net income attributable to Waste Connections for basic and diluted earnings per share	$ 148,848	$ 138,682	$ 274,470	$ 263,551
Denominator:
Basic shares outstanding	263,846,970	263,691,172	263,725,867	263,757,179
Dilutive effect of equity-based awards	647,973	640,857	690,743	695,606
Diluted shares outstanding	264,494,943	264,332,029	264,416,610	264,452,785

X

- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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