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Income Taxes - Summary of Reconciliation of Unrecognized Tax Benefits (Detail) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Reconciliation Of Changes In Deferred Tax Liability Asset [Abstract] |  |
Unrecognized tax benefits, beginning of year | $ 1,923 | $ 19,618
Additions: |  |
Prior year’s tax positions | 57 | 56
Reductions: |  |
Prior year’s tax positions |  | (17,751)
Unrecognized tax benefits, end of year | $ 1,980 | $ 1,923

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