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Long-Term Debt Maturities (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]        
Long-term debt, gross $ 1,445,127 $ 1,112,895 $ 1,729,351 $ 1,266,729
2021 [Member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]        
Long-term debt, gross 117,678      
2023 [Member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]        
Long-term debt, gross 447,792      
Thereafter [Member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]        
Long-term debt, gross $ 879,657