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Financial risk management, objectives and policies (Details 1) - PEN (S/) S/ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |
Effect on profit before tax | S/ 128,417 | S/ 198,110 | S/ 306,770
Change in year-end price +10 [Member] | Commodity Price Risk [Member] |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |
Effect on profit before tax | (3,148) | (3,780) |
Change in year-end price -10 [Member] | Commodity Price Risk [Member] |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |
Effect on profit before tax | S/ 3,148 | S/ 3,780 |

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