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Summary of Operating and General and Administrative Expenses (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Expense By Nature [Abstract]    
Wages, salaries and benefits $ 697,935 $ 728,101
Purchased materials, supplies and services 429,365 422,359
Share based compensation 22,115 15,598
Operating and general and administrative expenses 1,149,415 1,166,058
Allocated to:    
Operating expense 1,038,967 1,067,264
General and administrative 104,010 111,830
Restructuring 6,438 1,164
Other recoveries   (14,200)
Operating and general and administrative expenses $ 1,149,415 $ 1,166,058