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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
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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 |

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