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Financial risk management (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Financial risk management [Line Items] |  |  |
10% increase in future copper prices | $ 2,474 | $ (924) | $ 6,233
10% decrease in future copper prices | (2,459) | $ 926 | $ (7,618)
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |
Disclosure Of Financial risk management [Line Items] |  |  |
10% increase in future copper prices | 83,955 |  |
10% decrease in future copper prices | $ (83,955) |  |

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