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Other Financial Liabilities (debt) - Additional information (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Jun. 30, 2017
Mar. 31, 2014
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Other Financial Liabilities debt [Line Items]          
Repayments of borrowings, classified as financing activities     $ 7,197 $ 95,000 $ 95,000
Write off debt issuance costs     900    
Extinguishment debt issuance cost       1,300 1,900
Senior unsecured credit facility [Member]          
Disclosure Of Other Financial Liabilities debt [Line Items]          
Borrowings $ 1,500,000        
Repayments of borrowings, classified as financing activities     975,000 305,000  
Increased in Credit Facility $ 225,000        
Interest expense     $ 22,400 39,100 $ 49,600
Citi bank [Member] | Senior unsecured credit facility [Member]          
Disclosure Of Other Financial Liabilities debt [Line Items]          
Notional amount   $ 1,800,000      
Term of credit facility   5 years      
Sociedad Minera El Brocal S.A.A          
Disclosure Of Other Financial Liabilities debt [Line Items]          
Borrowings, interest rate basis     Interest on the credit facility is based on the London Interbank Offered Rate (LIBOR) plus a spread (currently 1.9%) based on the Company´s total net debt to earnings before interest, taxes, depreciation and amortization (EBITDA) ratio, as defined in the agreement.    
Description of amortization of credit facility     The credit facility calls for amortization in four installments, with 15% of the total facility due on December 31, 2020 (fully repaid as of December 31, 2020), 15% due on June 30, 2021 (fully repaid as of December 31, 2020), 35% due on December 31, 2021 (fully repaid as of December 31, 2020) and 35% due on June 19, 2022 (US$525 million).    
Write off debt issuance costs     $ 1,700 1,800  
Extinguishment debt issuance cost     $ 900 $ 1,300