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Income taxes - Income Tax Expense (Recovery) Attributable to Income (Loss) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Tax Expenses [Line Items]    
Current $ 7,237 $ 4,888
Deferred (50,662) 59,695
Total (43,425) 64,583
Canada    
Income Tax Expenses [Line Items]    
Current 4,560 4,319
Deferred (33,993) 62,061
Total (29,433) 66,380
United States    
Income Tax Expenses [Line Items]    
Current 1,024 (1,448)
Deferred (19,772) (1,745)
Total (18,748) (3,193)
Other regions    
Income Tax Expenses [Line Items]    
Current 1,653 2,017
Deferred 3,103 (621)
Total $ 4,756 $ 1,396