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Shareholders' equity, net - Partners' equity (Details) - Minera Yanacocha SRL and subsidiary [Member] - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 21, 2017
Dec. 31, 2020
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2019
Dec. 31, 2018
Jun. 14, 2018
Feb. 19, 2018
Disclosure Of Partners Equity Net LineItems [Line Items]                
Number of shares issued and fully paid         656,484,745 656,484,745    
Subsidiary Sale Of Stock Shares Approved For Reduction               63,922,565
Subsidiary Sale Of Stock Shares Approved For Sale             63,922,565  
Applicable Dividend Distribution Tax Rate     5.00% 6.80%        
Treasury shares [member]                
Disclosure Of Partners Equity Net LineItems [Line Items]                
Number of shares purchased 63,922,565              
Payments to acquire or redeem entity's shares $ 47,911              
Percentage of stock purchased 5.00%              
Common shares [member]                
Disclosure Of Partners Equity Net LineItems [Line Items]                
Number of shares issued and fully paid   1,214,528,739     1,214,528,739      
Value of shares issued and fully paid   $ 398,216            
Subsidiary sale of stock value approved for reduction               $ 19,711