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Components of Accounts Payable and Accrued Liabilities (Detail) - CAD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts Payable And Accrued Liabilities [Abstract]    
Accounts payable $ 87,436 $ 73,239
Accrued liabilities:    
Payroll 58,550 59,595
Other 63,639 107,902
Accounts payable and accrued liabilities $ 209,625 $ 240,736