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Financial assets and financial liabilities (Details Narrative) S/ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 PEN (S/) | Dec. 31, 2016 PEN (S/) | Dec. 31, 2017 USD ($) | Feb. 01, 2013 USD ($)
Disclosure of financial assets [line items] |  |  |  |
Gains (loss) and losses on derivatives held as cash flow hedges | S/ | S/ 38,230 | S/ 39,511 |  |
Senior Notes [Member] | USD |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Notional amount |  |  |  | $ 300,000
Currency swap contract [Member] | Senior Notes [Member] | Hedging instruments [Member] | USD |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Notional amount |  |  | $ 300,000 |

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