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Shareholders’ equity, net (Details) S/ in Thousands, $ in Thousands | Dec. 31, 2017 USD ($) shares | Dec. 31, 2017 PEN (S/) shares | Dec. 31, 2016 USD ($)
--- | --- | --- | ---
Disclosure of Shareholders’ equity, net [Line Items] |  |  |
Capital stock | $ | $ 750,497 |  | $ 750,497
Common shares [member] |  |  |
Disclosure of Shareholders’ equity, net [Line Items] |  |  |
Number of shares | 274,889,924 | 274,889,924 |
Capital stock | $ 813,162 | S/ 2,748,899 |
Treasury shares [member] |  |  |
Disclosure of Shareholders’ equity, net [Line Items] |  |  |
Number of shares | (21,174,734) | (21,174,734) |
Capital stock | $ (62,665) | S/ (211,747) |
Total Shares [Member] |  |  |
Disclosure of Shareholders’ equity, net [Line Items] |  |  |
Number of shares | 253,715,190 | 253,715,190 |
Capital stock | $ 750,497 | S/ 2,537,152 |

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