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Long-Term Debt Maturities (Detail) - CAD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Long-term debt, gross $ 1,758,519 $ 1,933,993
2021 [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Long-term debt, gross 312,601  
Thereafter [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Long-term debt, gross $ 1,445,918