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Income Taxes - Summary of Deferred Tax (Assets) and Liabilities (Detail) - CAD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liabilities	$ 0	$ 0	$ 867
Convertible debentures [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liabilities	12,928	1,559
Non-capital losses [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liabilities	(103,636)	(73,070)
Investment in associate [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liabilities	23,432	24,853
Exploration and evaluation assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liabilities	$ 67,276	$ 46,658