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Long-Term Debt Maturities (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
USD ($)
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]        
Long-term debt, gross $ 1,729,351 $ 1,266,729 $ 1,758,519 $ 1,398,625
2021 [Member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]        
Long-term debt, gross 226,113      
2023 [Member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]        
Long-term debt, gross 477,823      
Thereafter [Member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]        
Long-term debt, gross $ 1,025,415