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Income Taxes - Additional Information (Detail) - CAD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |  |
US federal corporate tax rate |  | 35.00% |  |
Deferred income tax expense on revaluation of US federal income tax rate |  | $ 15,800,000 |  |
Long-term receivable for alternative minimum tax carryforward balance |  | 2,300,000 |  |
Loss carryforwards not recognized as deferred incom tax asset |  | 31,500 |  |
Unrecognized tax benefits |  | 1,980,000 | $ 1,923,000 | $ 19,618,000
Interest and penalties included in unrecognized tax benefits |  | 500,000 | 400,000 |
Unrecognized tax benefits realized in next twelve months |  | 0 | 0 |
Temporary differences [Member] |  |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |  |
Tax effected temporary differences related to US operations |  | $ 38,800,000 | $ 14,000,000 |
Scenario, Forecast [Member] |  |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |  |
US federal corporate tax rate | 21.00% |  |  |

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