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Income Taxes - Additional Information (Details) - CAD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2016
Income Taxes [Abstract] |  |  |
Deferred tax assets, unrecognized | $ 469,700 | $ 28,000 |
Unrecognized deferred tax assets, deductible temporary differences | 854,200 |  |
Unrecognized deferred tax assets, capital losses | 237,900 |  |
Unrecognized deferred tax assets. non-capital losses | 1,015,200 |  |
Accumulated non-capital losses |  |  | $ 591,000
Effect of U.S. tax change | $ 19,807 |  |

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