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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Other Financial Liabilities debt [Line Items]          
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, 2019), 15% due on June 30, 2021 (fully repaid as of December 31, 2019), 35% due on December 31, 2021 (US$305 million after the March 2019 repayment) and 35% due on June 19, 2022 (US$525 million).    
Repayments of borrowings, classified as financing activities     $ 95,000 $ 95,000 $ 300,000
Write off debt issuance costs     1,300 1,900 $ 2,000
Senior unsecured credit facility [Member]          
Disclosure Of Other Financial Liabilities debt [Line Items]          
Borrowings $ 1,500,000        
Repayments of borrowings, classified as financing activities     $ 670,000 $ 470,000  
Increased in Credit Facility $ 225,000        
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. [Member]          
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.