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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

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