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Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Earnings per share [Line Items] |  |  |
Net loss | $ 64,435 | $ (327,814) | $ (375,545)
Weighted average number of share outstanding (Note 13(a)) | 253,986,867 | 253,986,867 | 254,186,867
Basic and diluted earnings per share | $ 0.24 | $ (1.27) | $ (1.25)
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |
Disclosure Of Earnings per share [Line Items] |  |  |
Net loss | $ 349,881,000 | $ 340,907,000 | $ 33,284,000
Weighted average number of share outstanding (Note 13(a)) | 350,056,012 | 350,056,012 | 350,056,012
Basic and diluted earnings per share | $ 1 | $ 0.974 | $ 0.095

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