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Summary of Operating and General and Administrative Expenses (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Expense By Nature [Abstract]    
Wages, salaries and benefits $ 728,101 $ 580,482
Purchased materials, supplies and services 422,359 433,827
Share based compensation 15,598 1,934
Operating and general and administrative expenses 1,166,058 1,016,243
Allocated to:    
Operating expense 1,067,871 926,171
General and administrative 112,387 90,072
Other recoveries (14,200)  
Operating and general and administrative expenses $ 1,166,058 $ 1,016,243