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Long-Term Debt Maturities (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($)
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Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |  |  |
Long-term debt, gross | $ 1,729,351 | $ 1,266,729 | $ 1,758,519 | $ 1,398,625
2021 [Member] |  |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |  |  |
Long-term debt, gross | 226,113 |  |  |
2023 [Member] |  |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |  |  |
Long-term debt, gross | 477,823 |  |  |
Thereafter [Member] |  |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |  |  |
Long-term debt, gross | $ 1,025,415 |  |  |

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