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Commitments and contingencies - Open tax procedures - l (Details) - Twenty-Second Administrative Litigation Court - Year 2008 [Member] |  | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2020 PEN (S/) | Dec. 31, 2019 | Apr. 30, 2019 PEN (S/) | Dec. 31, 2020 PEN (S/) | Dec. 31, 2020 USD ($) | Jan. 31, 2020 USD ($) | Apr. 30, 2019 USD ($)
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |
Percentage of injunction of tax debt | 60.00% |  | 60.00% |  |  |  |
Letters of guarantee outstanding, amount |  |  | S/ 511,030,000 |  |  |  | $ 141,013,000
Validity of letter of guarantee |  |  | 12 months |  |  |  |
Tax debt | S/ 892,682,000 |  |  |  |  | $ 246,325,000 |
New guarantee contract |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |
Letters of guarantee outstanding, amount |  |  |  | S/ 535,609,000 | $ 147,795,000 |  |
Validity of letter of guarantee |  | 12 months |  |  |  |  |

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