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Summary of Operating and General and Administrative Expenses (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Expenses by nature [abstract]    
Wages, salaries and benefits $ 482,695 $ 438,209
Wage subsidies (24,108) (26,297)
Purchased materials, supplies and services 278,743 240,591
Share-based compensation 56,745 19,847
Operating and general and administrative expenses 794,075 672,350
Allocated to:    
Operating expense 698,144 583,420
General and administrative 95,931 70,869
Restructuring 0 18,061
Operating and general and administrative expenses $ 794,075 $ 672,350