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Other Financial Liabilities (debt) - Movement of the changes derived from the financing activities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |
Cash flows from (used in) financing activities | $ (35,258) | $ (100,618) | $ (74,052)
Sociedad Minera El Brocal S.A.A |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |
Other financial liabilities | 911,675 | 1,118,538 |
Additions | 3,328 | 550 |
Payments | (314,376) | (210,479) |
Long term to short term transfers | 0 | 0 |
Others change in other financial liabilities | 2,041 | 3,066 |
Other financial liabilities | 602,668 | 911,675 | 1,118,538
Leases, Current [Member] | Sociedad Minera El Brocal S.A.A |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |
Other financial liabilities | 8,855 | 8,119 |
Additions | 1,477 | 464 |
Payments | (9,376) | (10,479) |
Long term to short term transfers | 9,402 | 10,751 |
Others change in other financial liabilities | (135) | 0 |
Other financial liabilities | 10,223 | 8,855 | 8,119
Noncurrent, Leases [Member] | Sociedad Minera El Brocal S.A.A |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |
Other financial liabilities | 76,944 | 87,609 |
Additions | 1,851 | 86 |
Payments | 0 | 0 |
Long term to short term transfers | (9,402) | (10,751) |
Others change in other financial liabilities | (399) | 0 |
Other financial liabilities | 68,994 | 76,944 | 87,609
Senior unsecured credit facility [Member] | Sociedad Minera El Brocal S.A.A |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |
Other financial liabilities | 830,000 | 1,030,000 |
Additions | 0 | 0 |
Payments | (305,000) | (200,000) |
Long term to short term transfers | 0 | 0 |
Others change in other financial liabilities | 0 | 0 |
Other financial liabilities | 525,000 | 830,000 | 1,030,000
Debt issuance cost [Member] | Sociedad Minera El Brocal S.A.A |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |
Other financial liabilities | 4,124 | 7,190 |
Additions | 0 | 0 |
Payments | 0 | 0 |
Long term to short term transfers | 0 | 0 |
Others change in other financial liabilities | 2,575 | 3,066 |
Other financial liabilities | $ 1,549 | $ 4,124 | $ 7,190

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