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Commitments and contingencies (Details Narrative 1) - PEN (S/) S/ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Disclosure of contingent liabilities in business combination [line items] |  |  |  |  |  |
Applicable tax rate | 26.00% | 27.00% | 29.50% | 28.00% | 28.00% | 30.00%
Other provisions |  |  | S/ 52,868 | S/ 53,753 | S/ 61,518 |
Legal claim contingency |  |  | 16,570 |  |  |
Labor Claims From Former Employees [Member] |  |  |  |  |  |
Disclosure of contingent liabilities in business combination [line items] |  |  |  |  |  |
Legal claim contingency |  |  | 1,687 |  |  |
Tax contingent liability [member] |  |  |  |  |  |
Disclosure of contingent liabilities in business combination [line items] |  |  |  |  |  |
Legal claim contingency |  |  | 2,298 |  |  |
Tax Administration [Member] |  |  |  |  |  |
Disclosure of contingent liabilities in business combination [line items] |  |  |  |  |  |
Legal claim contingency |  |  |  | 4,904 |  |
Property Tax Assessment for Periods 2009 to 2014 [Member] |  |  |  |  |  |
Disclosure of contingent liabilities in business combination [line items] |  |  |  |  |  |
Legal claim contingency |  |  | 7,681 |  |  |
Rehabilitation Provision [Member] |  |  |  |  |  |
Disclosure of contingent liabilities in business combination [line items] |  |  |  |  |  |
Other provisions |  |  | S/ 2,399 | S/ 2,367 |  |
Bottom of Range [Member] |  |  |  |  |  |
Disclosure of contingent liabilities in business combination [line items] |  |  |  |  |  |
Applicable tax rate profit after deducting employee participation |  |  | 8.00% |  |  |
Top of Range [Member] |  |  |  |  |  |
Disclosure of contingent liabilities in business combination [line items] |  |  |  |  |  |
Applicable tax rate profit after deducting employee participation |  |  | 10.00% |  |  |

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