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Income Taxes - Additional Information (Detail) - CAD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Change in provincial corporate income tax rate | 8.00% |  |
Temporary differences [Member] | International operations [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Tax effected temporary differences |  | $ 1 | $ 5

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