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Long-Term Debt Maturities (Detail) - CAD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Long-term debt, gross | $ 1,758,519 | $ 1,933,993
2021 [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Long-term debt, gross | 312,601 |
Thereafter [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Long-term debt, gross | $ 1,445,918 |

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