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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Aug. 29, 2025
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of concession rights |  | $ 1.9
Estimated capital expenditures to commence mining operations |  | $ 91.2
Fair value measurement input description | Significant inputs include the estimated discount due to uncertainty of reinstatement (85%-95%), estimated capital expenditures necessary to commence mining operations ($91.2 million), discount rate (12.5%), estimated market multiple (0.65 x), and debt to true interest cost ratio (35%). |
Estimated fair value measurement input |  | 0.0065
Fair value discount rate |  | 12.50%
Debt to true interest cost ratio |  | 35.00%
Maximum [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Estimated discount due to uncertainty reinstatement |  | 95.00%
Minimum [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Estimated discount due to uncertainty reinstatement |  | 85.00%

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