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Financial risk management (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Financial risk management [Line Items] |  |  |
10% increase in future copper prices | $ 1,695 | $ 2,474 | $ (924)
10% decrease in future copper prices | (1,681) | (2,459) | 926
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |
Disclosure Of Financial risk management [Line Items] |  |  |
10% increase in future copper prices | 72,847 | 83,955 | 88,508
10% decrease in future copper prices | $ (72,847) | $ (83,955) | $ (88,508)

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