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Schedule of Original Measurement Categories and Carrying Amounts for Each Financial Asset and Liability (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2016
Financial Assets      
Cash and cash equivalents, Carrying Amount $ 65,081 $ 96,626 $ 115,705
Accounts receivable, Carrying Amount 322,585 372,336  
Financial Liabilities      
Accounts payable and accrued liabilities, Carrying Amount 209,625 274,489  
Long-term debt, Carrying Amount 1,730,437 $ 1,706,253  
IFRS 9 [Member]      
Financial Assets      
Cash and cash equivalents, Carrying Amount 65,081    
Accounts receivable, Carrying Amount 322,585    
Financial assets, Carrying Amount 387,666    
Financial Liabilities      
Accounts payable and accrued liabilities, Carrying Amount 209,625    
Long-term debt, Carrying Amount 1,730,437    
Financial Liabilities, Carrying Amount $ 1,940,062    
Cash and cash equivalents, measurement category Amortized cost    
Accounts receivable, measurement category Amortized cost    
Accounts payable and accrued liabilities, measurement category Amortized cost    
Long-term debt, measurement category Amortized cost    
IAS 39 [Member]      
Financial Assets      
Cash and cash equivalents, Carrying Amount $ 65,081    
Accounts receivable, Carrying Amount 322,585    
Financial assets, Carrying Amount 387,666    
Financial Liabilities      
Accounts payable and accrued liabilities, Carrying Amount 209,625    
Long-term debt, Carrying Amount 1,730,437    
Financial Liabilities, Carrying Amount $ 1,940,062    
Cash and cash equivalents, measurement category Loans and receivables    
Accounts receivable, measurement category Loans and receivables    
Accounts payable and accrued liabilities, measurement category Other financial liabilities    
Long-term debt, measurement category Other financial liabilities