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Summary of Operating and General and Administrative Expenses (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Expense By Nature [Abstract]    
Wages, salaries and benefits $ 438,209 $ 697,935
Wage subsidies (26,297)  
Purchased materials, supplies and services 240,591 429,365
Share based compensation 19,847 22,115
Operating and general and administrative expenses 672,350 1,149,415
Allocated to:    
Operating expense 583,420 1,038,967
General and administrative 70,869 104,010
Restructuring 18,061 6,438
Operating and general and administrative expenses $ 672,350 $ 1,149,415