Contingencies - Additional Information (Details) - USD ($)			3 Months Ended	12 Months Ended				147 Months Ended
	Feb. 14, 2023	Dec. 11, 2018	Dec. 31, 2018	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2016	Dec. 31, 2023	Feb. 29, 2024
Loss Contingencies [Line Items]
Other current liabilities				$ 28,472,000	$ 26,380,000			$ 28,472,000
Other liabilities				12,108,000	15,270,000			12,108,000
New Idria Mercury Mine [Member]
Loss Contingencies [Line Items]
Financial assurance required to be provided to EPA to secure performance			$ 2,000,000
Expected insurance recoveries				7,200,000				7,200,000
New Almaden Mine (Formerly Referred to as Guadalupe River Watershed) [Member] | Natural Resource Damage Claim [Member]
Loss Contingencies [Line Items]
Payments made				100,000
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
Patent Infringement [Member]
Loss Contingencies [Line Items]
Loss Contingency, Receivable, Proceeds				3,200,000
Expected insurance recoveries				6,800,000				6,800,000
Defense costs incurred		$ 13,300,000		3,600,000	3,100,000	$ 3,200,000
Defence costs related to insurance coverage				10,000,000
Patent Infringement [Member] | Subsequent Event [Member]
Loss Contingencies [Line Items]
Insurance recoveries receivable									$ 6,800,000
Scepter Company [Member] | Ms.McCartney [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	$ 30,000
Accounts Receivable [Member] | New Idria Mercury Mine [Member]
Loss Contingencies [Line Items]
Expected insurance recoveries				3,600,000				3,600,000
Other long-term Member | New Idria Mercury Mine [Member]
Loss Contingencies [Line Items]
Expected insurance recoveries				$ 3,600,000				3,600,000
Selling, General and Administrative Expenses [Member] | New Almaden Mine (Formerly Referred to as Guadalupe River Watershed) [Member] | Natural Resource Damage Claim [Member]
Loss Contingencies [Line Items]
Loss contingency, Loss in period					$ 3,000,000
Pending Litigation [Member] | New Idria Mercury Mine [Member] | EPA Notice Letter [Member]
Loss Contingencies [Line Items]
Loss Contingency, Receivable, Proceeds								4,000,000
Loss contingency, Loss in period								22,000,000
Payments made								$ 10,800,000