Net Income Per Share Information (Basic and Diluted Net Income Per Common Share) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net income attributable to Waste Connections for basic and diluted earnings per share	$ 236,912	$ 114,381	$ 641,310	$ 451,736
Denominator:
Basic shares outstanding	257,197,010	260,550,774	257,438,756	261,372,827
Dilutive effect of equity-based awards	694,625	594,446	621,995	506,927
Diluted shares outstanding	257,891,635	261,145,220	258,060,751	261,879,754