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Subsidiaries with material non-controlling interest (Details 1) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Current assets | $ (701,862) | $ (501,928) |  |
Non-current assets | (3,630,951) | (3,764,487) |  |
Current liabilities | 521,194 | 445,125 |  |
Non-current liabilities | 747,992 | 774,077 |  |
Total shareholders’ equity, net | 3,063,627 | 3,047,213 | $ 3,389,236 | $ 3,762,125
Shareholders of the parent | 2,848,037 | 2,821,091 |  |
Non-controlling interests | 215,590 | 226,122 | $ 228,170 |
Sociedad Minera El Brocal S.A.A. [Member] |  |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Current assets | 146,865 | 120,291 |  |
Non-current assets | 645,729 | 642,790 |  |
Current liabilities | (159,190) | (184,324) |  |
Non-current liabilities | (229,709) | (168,589) |  |
Total shareholders’ equity, net | 403,695 | 410,168 |  |
Shareholders of the parent | 239,925 | 242,182 |  |
Non-controlling interests | 165,032 | 167,986 |  |
S.M.R.L. Chaupiloma Dos de Cajamarca [Member] |  |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Current assets | 6,640 | 7,439 |  |
Non-current assets | 0 | 0 |  |
Current liabilities | (2,407) | (2,684) |  |
Non-current liabilities | 0 | 0 |  |
Total shareholders’ equity, net | 4,233 | 4,755 |  |
Shareholders of the parent | 2,540 | 2,849 |  |
Non-controlling interests | 1,693 | 1,906 |  |
Minera La Zanja S.R.L. [Member] |  |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Current assets | 134,758 | 155,659 |  |
Non-current assets | 55,873 | 90,447 |  |
Current liabilities | (38,807) | (40,411) |  |
Non-current liabilities | (48,201) | (89,278) |  |
Total shareholders’ equity, net | 103,623 | 116,417 |  |
Shareholders of the parent | 54,981 | 60,804 |  |
Non-controlling interests | 48,642 | 55,613 |  |
Apu Coropuna S.R.L. [Member] |  |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Current assets | 1,440 | 2,301 |  |
Non-current assets | 189 | 88 |  |
Current liabilities | (143) | (129) |  |
Non-current liabilities | (740) | 0 |  |
Total shareholders’ equity, net | 746 | 2,260 |  |
Shareholders of the parent | 523 | 1,582 |  |
Non-controlling interests | 223 | 678 |  |
Other minor subsidiaries [Member] |  |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Current assets | 665 | 81 |  |
Non-current assets | 30 | 500 |  |
Current liabilities | (29) | 0 |  |
Non-current liabilities | (2) | (2) |  |
Total shareholders’ equity, net | 664 | 579 |  |
Shareholders of the parent | 664 | 640 |  |
Non-controlling interests | 0 | (61) |  |
Subsidiaries with material non-controlling interests [member] |  |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Current assets | 290,368 | 285,771 |  |
Non-current assets | 701,821 | 733,825 |  |
Current liabilities | (200,576) | (227,548) |  |
Non-current liabilities | (278,652) | (257,869) |  |
Total shareholders’ equity, net | 512,961 | 534,179 |  |
Shareholders of the parent | 298,633 | 308,057 |  |
Non-controlling interests | $ 215,590 | $ 226,122 |  |

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- Definition The amount of assets that the entity (a) expects to realise or intends to sell or consume in its normal operating cycle; (b) holds primarily for the purpose of trading; (c) expects to realise within twelve months after the reporting period; or (d) classifies as cash or cash equivalents (as defined in IAS 7) unless the asset is restricted from being exchanged or used to settle a liability for at least twelve months after the reporting period. [Refer: Assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph B12 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B12_b_i&doctype=Appendix&seq=2 -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_66&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph B10 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B10_b&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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