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Income Taxes - Summary of Movement in Deferred Tax Liability (Detail) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Changes in deferred tax liability (asset) [abstract] |  |
Opening balance | $ 0 | $ 867
Recognized in income tax expense (recovery) | (4,567) | 657
Recognized in OCI/equity | 4,567 | (449)
Disposal due to deconsolidation of IsoEnergy | 0 | (1,075)
Net deferred tax liability | $ 0 | $ 0

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