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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 |

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