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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Numerator: |  |  |  |
Net income attributable to Waste Connections for basic and diluted earnings per share | $ 123,227 | $ 88,617 | $ 261,732 | $ 160,948
Denominator: |  |  |  |
Basic shares outstanding | 263,443,064 | 263,005,450 | 263,298,839 | 219,321,828
Dilutive effect of equity-based awards | 856,408 | 644,688 | 810,544 | 742,842
Diluted shares outstanding | 264,299,472 | 263,650,138 | 264,109,383 | 220,064,670

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