Income and Mining Taxes - Summary of Tax Credit Carryforwards (Details) $ in Thousands	Dec. 31, 2025 USD ($)
Tax Credit Carryforward [Line Items]
Regular net operating losses	$ 1,086,868
Capital losses	82,248
Foreign tax credits	10,864
United States
Tax Credit Carryforward [Line Items]
Regular net operating losses	522,637
Capital losses	55,885
Foreign tax credits	10,864
Canada
Tax Credit Carryforward [Line Items]
Regular net operating losses	480,612
Capital losses	26,363
Mexico
Tax Credit Carryforward [Line Items]
Regular net operating losses	4,971
New Zealand
Tax Credit Carryforward [Line Items]
Regular net operating losses	77,861
Other jurisdictions
Tax Credit Carryforward [Line Items]
Regular net operating losses	$ 787