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Balance Sheet Classification of Provisions and Other (Detail) - CAD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure Of Other Provisions [Abstract] |  |  |
Current | $ 3,146 | $ 3,040 |
Long-term | 10,086 | 12,421 |
Other provisions | $ 13,232 | $ 15,461 | $ 18,829

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