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Commitments and contingencies - Open tax procedures (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 13, 2020 PEN (S/) | Nov. 13, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 PEN (S/) | Dec. 31, 2020 USD ($)
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |
Compulsory collection of income tax |  |  | $ 736,912,000 |  |
Tax Assessments, penalties and interest expenses |  |  | 442,302,000 |  |
Tax Assessments Estimated Possible Losses |  |  | $ 294,610,000 |  |
SUNAT | Year 2007 and 2008 |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |
Compulsory collection of income tax | S/ 1,567,297,000 | $ 432,477,000 |  |  |
Tax Assessments, penalties and interest expenses | 1,375,248,000 | 379,483,000 |  |  |
Collection of debt forced amount |  |  |  | S/ 72,065,000 | $ 19,918,000
Tax Assessments Estimated Possible Losses | S/ 192,049,000 | $ 52,994,000 |  |  |

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