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Segmented information - Information on Operations by Geographic Area (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting Information [Line Items]        
Revenue $ 343,638 $ 343,578 $ 808,539 $ 820,803
Canada        
Segment Reporting Information [Line Items]        
Revenue 33,923 21,633 81,668 40,164
United States        
Segment Reporting Information [Line Items]        
Revenue $ 309,715 $ 321,945 $ 726,871 $ 780,639