v3.26.1
Contractual Obligations and Commitments - Additional Information (Detail)
$ in Thousands, $ in Millions
 6 Months Ended
Jun. 30, 2026
USD ($)
Meters
Jul. 23, 2026
USD ($)
Jun. 30, 2026
CAD ($)
Apr. 02, 2026
USD ($)
Dec. 31, 2025
USD ($)
Disclosure of contingent liabilities [line items]          
Upfront cash consideration to be paid [1],[2] $ 322,000       $ 322,000
Loma de La Plata [member]          
Disclosure of contingent liabilities [line items]          
Upfront cash consideration to be paid 32,000        
Toroparu [member]          
Disclosure of contingent liabilities [line items]          
Upfront cash consideration to be paid $ 138,000        
Reduced stream percentage of gold 0.909%   0.909%    
Current stream percentage of gold 10.00%   10.00%    
Amount of non-refundable advance $ 2,000        
Current stream percentage of silver 50.00%   50.00%    
Reduced stream percentage of silver 0.00%   0.00%    
Cotabambas [member]          
Disclosure of contingent liabilities [line items]          
Upfront cash consideration to be paid $ 126,000        
Amount of non-refundable advance 2,000        
Kutcho [member]          
Disclosure of contingent liabilities [line items]          
Upfront cash consideration to be paid 58,000        
Salobo [member] | High Grade Mine Plan [Member]          
Disclosure of contingent liabilities [line items]          
Estimated expansion payments 8,000        
Marmato [member]          
Disclosure of contingent liabilities [line items]          
Upfront cash consideration to be paid 42,000        
Marathon [Member]          
Disclosure of contingent liabilities [line items]          
Upfront cash consideration to be paid 141,000   $ 200    
Santo Domingo [Member]          
Disclosure of contingent liabilities [line items]          
Upfront cash consideration to be paid 290,000        
Copper World [Member]          
Disclosure of contingent liabilities [line items]          
Upfront cash consideration to be paid 230,000        
First installment payable on permitting projet 50,000        
Balance installment amount payable once project costs incurred exceeds specified amount 180,000        
Project costs incurred to trigger balance installment payable 98,000        
Kudz Ze Kayah [Member]          
Disclosure of contingent liabilities [line items]          
Additional contingency payment for agreement 15,000        
Curraghinalt [Member]          
Disclosure of contingent liabilities [line items]          
Upfront cash consideration to be paid 55,000        
Cangrejos [Member]          
Disclosure of contingent liabilities [line items]          
Upfront cash consideration to be paid 169,000        
Mineral Park [Member]          
Disclosure of contingent liabilities [line items]          
Maximum credit facility to be provided 25,000        
Amount advanced under borrowing facility   $ 15,000   $ 10,000  
El Domo [Member]          
Disclosure of contingent liabilities [line items]          
Upfront cash consideration to be paid 131,600        
Cash Consideration That Will Be Paid To Support Certain Local Community Development Initiatives 250        
Spring Valley [Member]          
Disclosure of contingent liabilities [line items]          
Upfront cash consideration to be paid 570,000        
Maximum available amount under cost overrun facility 150,000        
Jervois [Member]          
Disclosure of contingent liabilities [line items]          
Upfront cash consideration to be paid 259,000        
Upfront cash consideration to be paid subject to conditions 243,000        
Upfront cash consideration expected to be paid in Q3 2026 16,000        
Spanish Mountain [Member]          
Disclosure of contingent liabilities [line items]          
Additional consideration payable subject to milestones 32,500        
Spanish Mountain [Member] | Drilling Milestone [Member]          
Disclosure of contingent liabilities [line items]          
Additional consideration payable subject to milestones $ 12,500        
Drilling milestone requirement | Meters 60,000        
Spanish Mountain [Member] | Regulatory Approval Milestone [Member]          
Disclosure of contingent liabilities [line items]          
Additional consideration payable subject to milestones $ 20,000        
Cipango [Member]          
Disclosure of contingent liabilities [line items]          
Additional consideration payable subject to milestones $ 3,000        
[1] Expressed in thousands of United States dollars; excludes closing costs and capitalized interest, where applicable.
[2] Please refer to Note 24 for details of when the remaining upfront consideration to be paid becomes due.