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Balance Sheet Classification of Provisions and Other (Detail) - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure Of Other Provisions [Abstract] |  |  |
Current | $ 745 | $ 1,907 |
Long-term | 7,563 | 9,959 |
Other provisions | $ 8,308 | $ 11,866 | $ 13,373

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