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Income Taxes - Additional Information (Detail) - CAD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
US federal corporate tax rate | 21.00% | 35.00% |
Deferred income tax expense on revaluation of US federal income tax rate |  | $ 15,800 |
Long-term receivable for alternative minimum tax carryforward balance |  | 2,400 |
Loss carryforwards not recognized as deferred incom tax asset | $ 37,100 |  |
Unrecognized tax benefits | 2,040 | 1,980 | $ 1,923
Interest and penalties included in unrecognized tax benefits | 500 | 500 |
Unrecognized tax benefits realized in next twelve months | 2,000 |  |
Temporary differences [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Tax effected temporary differences related to US operations | $ 33,200 | $ 38,800 |

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