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Schedule of Long Term Borrowings (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
USD ($)
Disclosure of long term debt [Line Items]        
Long-term debt, gross $ 1,729,351 $ 1,266,729 $ 1,758,519 $ 1,398,625
Less net unamortized debt issue costs (23,098)   (28,082)  
Long-term debt 1,706,253   1,730,437  
6.5% Senior Notes Due 2021 [Member]        
Disclosure of long term debt [Line Items]        
Long-term debt, gross 226,113 165,625 312,601 248,625
7.75% Senior Notes Due 2023 [Member]        
Disclosure of long term debt [Line Items]        
Long-term debt, gross 477,823 350,000 440,062 350,000
5.25% Senior Notes Due 2024 [Member]        
Disclosure of long term debt [Line Items]        
Long-term debt, gross 479,331 351,104 502,928 400,000
7.125% Senior Notes Due 2026 [Member]        
Disclosure of long term debt [Line Items]        
Long-term debt, gross $ 546,084 $ 400,000 $ 502,928 $ 400,000