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Contingencies - Additional Information (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 168 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 18, 2025 | Feb. 14, 2023 | Dec. 31, 2018 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2016 | Sep. 30, 2025 | Dec. 31, 2024
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Other current liabilities |  |  |  | $ 26,892,000 |  |  | $ 26,892,000 | $ 26,794,000
Other liabilities |  |  |  | 15,048,000 |  |  | 15,048,000 | $ 15,303,000
New Idria Mercury Mine [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Financial assurance required to be provided to EPA to secure performance |  |  | $ 2,000,000 |  |  |  |  |
New Almaden Mine (Formerly Referred to as Guadalupe River Watershed) [Member] | Natural Resource Damage Claim [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total reserve |  |  |  | 4,400,000 |  |  | 4,400,000 |
Other current liabilities |  |  |  | 300,000 |  |  | 300,000 |
Other liabilities |  |  |  | 4,100,000 |  |  | 4,100,000 |
Expense recognized |  |  |  | 0 | $ 0 |  |  |
Revised estimated project cost |  |  |  | $ 9,000,000 |  |  |  |
New Almaden Mine (Formerly Referred to as Guadalupe River Watershed) [Member] | Natural Resource Damage Claim [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Original estimated project costs |  |  |  |  |  | $ 3,300,000 |  |
New Almaden Mine (Formerly Referred to as Guadalupe River Watershed) [Member] | Natural Resource Damage Claim [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Original estimated project costs |  |  |  |  |  | $ 4,400,000 |  |
Scepter Company [Member] | Ms.McCartney [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value |  | $ 30,000 |  |  |  |  |  |
Scepter Company [Member] | Ryan Colvin [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value | $ 75,000 |  |  |  |  |  |  |
Pending Litigation [Member] | New Idria Mercury Mine [Member] | EPA Notice Letter [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Payments made |  |  |  |  |  |  | 16,500,000 |
Insurance recoveries |  |  |  |  |  |  | 8,000,000 |
Loss contingency, Loss in period |  |  |  |  |  |  | $ 26,000,000 |

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