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Summary of Operating and General and Administrative Expenses (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Expense By Nature [Abstract]    
Wages, salaries and benefits $ 580,482 $ 463,113
Purchased materials, supplies and services 433,827 275,840
Share-based compensation 1,934 36,205
Operating and general and administrative expenses 1,016,243 775,158
Allocated to:    
Operating expense 926,171 661,715
General and administrative 90,072 107,689
Restructuring   5,754
Operating and general and administrative expenses $ 1,016,243 $ 775,158