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Schedule of Long Term Borrowings (Detail)
$ in Thousands, $ in Millions
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CAD ($)
Disclosure of long term debt [Line Items]      
Long-term debt, gross $ 1,758,519   $ 1,933,993
Less net unamortized debt issue costs (28,082)   (27,059)
Long-term debt 1,730,437   1,906,934
6.625% Senior Notes Due 2020 [Member]      
Disclosure of long term debt [Line Items]      
Long-term debt, gross   $ 0.0 499,150
6.5% Senior Notes Due 2021 [Member]      
Disclosure of long term debt [Line Items]      
Long-term debt, gross 312,601 248.6 427,818
7.75% Senior Notes Due 2023 [Member]      
Disclosure of long term debt [Line Items]      
Long-term debt, gross 440,062 350.0 469,945
5.25% Senior Notes Due 2024 [Member]      
Disclosure of long term debt [Line Items]      
Long-term debt, gross 502,928 400.0 $ 537,080
7.125% Senior Notes Due 2026 [Member]      
Disclosure of long term debt [Line Items]      
Long-term debt, gross $ 502,928 $ 400.0