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Supplementary cash flow information - Summary of Change in cash flow information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Changes in non-cash working capital    
Accounts receivable and other $ (2,456) $ 17,168
Inventories (31,437) (18,264)
Accounts payable and accrued liabilities (1,862) 33,391
Total (35,755) 32,295
Supplementary cash flow information    
Income taxes paid 42,293 48,653
Interest paid $ 36,750 $ 37,114