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Supplementary cash flow information - Summary of Change in cash flow information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Changes in non-cash working capital    
Accounts receivable and other $ (1,471) $ (2,456)
Inventories 20,775 (31,437)
Accounts payable and accrued liabilities (14,242) (1,862)
Total 5,062 (35,755)
Supplementary cash flow information    
Income taxes paid 36,879 42,293
Interest paid $ 36,750 $ 36,750