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Long-Term Debt Maturities (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]        
Long-term debt, gross $ 1,249,153 $ 981,151 $ 1,445,127 $ 1,112,895
Long-term debt current and non-current, gross 1,250,049      
2021 [Member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]        
Long-term debt, gross 896      
2022 [Member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]        
Long-term debt, gross 896      
2023 [Member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]        
Long-term debt, gross 459,719      
2024 [Member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]        
Long-term debt, gross 335,995      
Thereafter [Member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]        
Long-term debt, gross $ 452,543