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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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Numerator:
Net income attributable to Waste Connections for basic and diluted earnings per share	$ 286,271	$ 308,046	$ 818,057	$ 813,577
Denominator:
Basic shares outstanding	256,948,902	258,023,661	257,835,515	257,939,935
Dilutive effect of equity-based awards	631,419	732,867	649,183	661,880
Diluted shares outstanding	257,580,321	258,756,528	258,484,698	258,601,815

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