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Schedule of Long Term Borrowings (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Disclosure of long term debt [Line Items]        
Long-term debt, gross $ 1,249,153 $ 981,151 $ 1,445,127 $ 1,112,895
Less net unamortized debt issue costs (12,943)   (17,946)  
Long-term debt 1,236,210   1,427,181  
Senior Credit Facility [Member]        
Disclosure of long term debt [Line Items]        
Long-term debt, gross 95,041 74,650    
Real Estate Credit Facility [Member]        
Disclosure of long term debt [Line Items]        
Current portion of long-term debt, gross 896 704    
Long-term debt, gross 12,474 9,797    
6.5% Senior Notes Due 2021 [Member]        
Disclosure of long term debt [Line Items]        
Long-term debt, gross     117,678 90,625
7.75% Senior Notes Due 2023 [Member]        
Disclosure of long term debt [Line Items]        
Long-term debt, gross 363,782 285,734 447,792 344,845
5.25% Senior Notes Due 2024 [Member]        
Disclosure of long term debt [Line Items]        
Long-term debt, gross 335,099 263,205 399,545 307,690
7.125% Senior Notes Due 2026 [Member]        
Disclosure of long term debt [Line Items]        
Long-term debt, gross $ 442,757 $ 347,765 $ 480,112 $ 369,735