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Related parties - Additional Information (Details) - Sociedad Minera Cerro Verde S.A.A. [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Related Party Explanatory [Line Items]      
Amounts receivable, related party transactions $ 598,873 $ 594,409  
Percentage of total revenues 0.25% 0.45% 0.42%
Freeport Minerals Corporation [Member]      
Disclosure Of Related Party Explanatory [Line Items]      
Amounts receivable, related party transactions $ 551,595 $ 462,304  
Climax Molybdenum Marketing Corporation [Member]      
Disclosure Of Related Party Explanatory [Line Items]      
Amounts receivable, related party transactions $ 23,247 $ 14,319