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Other Financial Liabilities (debt) (Details 1) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |
Cash flows from (used in) financing activities | $ 59,575 | $ (24,500) | $ 214,420
Sociedad Minera El Brocal S.A.A. [Member] |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |
Other financial liabilities | 1,996,004 | 2,425,165 | 452,850
Cash flows from (used in) financing activities | (738,260) | (443,169) | 1,965,481
Others change in other financial liabilites | 10,744 | 14,008 | 6,831
Other financial liabilities | 1,268,488 | 1,996,004 | 2,425,165
Leases [Member] | Sociedad Minera El Brocal S.A.A. [Member] |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |
Other financial liabilities | 161 | 330 | 493
Cash flows from (used in) financing activities | (161) | (169) | (163)
Others change in other financial liabilites | 0 | 0 | 0
Other financial liabilities | 0 | 161 | 330
Senior unsecured credit facility [Member] | Sociedad Minera El Brocal S.A.A. [Member] |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |
Other financial liabilities | 1,400,000 | 1,800,000 | 425,000
Cash flows from (used in) financing activities | (120,000) | (400,000) | 1,375,000
Others change in other financial liabilites | 0 | 0 | 0
Other financial liabilities | 1,280,000 | 1,400,000 | 1,800,000
Shareholder loans [Member] | Sociedad Minera El Brocal S.A.A. [Member] |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |
Other financial liabilities | 606,014 | 600,907 | 0
Cash flows from (used in) financing activities | (606,014) | 0 | 600,000
Others change in other financial liabilites | 0 | 5,107 | 907
Other financial liabilities | 0 | 606,014 | 600,907
Debt issuance cost [Member] | Sociedad Minera El Brocal S.A.A. [Member] |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |
Other financial liabilities | (10,171) | (19,072) | (22,643)
Cash flows from (used in) financing activities | (12,085) | 0 | (2,356)
Others change in other financial liabilites | 10,744 | 8,901 | 5,927
Other financial liabilities | (11,512) | (10,171) | (19,072)
Other financial liabilities, noncurrent liabilities [Member] | Sociedad Minera El Brocal S.A.A. [Member] |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |
Other financial liabilities | 1,995,843 | 2,381,835 | 402,357
Cash flows from (used in) financing activities | (738,099) | (400,000) | 1,972,644
Others change in other financial liabilites | 10,744 | 14,008 | 6,831
Other financial liabilities | 1,268,488 | 1,995,843 | 2,381,835
Promissory notes [Member] | Sociedad Minera El Brocal S.A.A. [Member] |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |
Other financial liabilities | 0 | 43,000 | 50,000
Cash flows from (used in) financing activities |  | (43,000) | (7,000)
Others change in other financial liabilites |  | 0 | 0
Other financial liabilities |  | 0 | 43,000
Other financial liabilities, current liabilities [Member] | Sociedad Minera El Brocal S.A.A. [Member] |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |
Other financial liabilities | $ 161 | 43,330 | 50,493
Cash flows from (used in) financing activities |  | (43,169) | (7,163)
Others change in other financial liabilites |  | 0 | 0
Other financial liabilities |  | $ 161 | $ 43,330

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