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Commitments and contingencies - Income tax declaration for 2014 (Details) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 PEN (S/) | Dec. 28, 2022 USD ($) | Dec. 28, 2022 PEN (S/) | Nov. 30, 2022 USD ($) | Nov. 30, 2022 PEN (S/) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 PEN (S/) | Mar. 15, 2021 USD ($) | Mar. 15, 2021 PEN (S/) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 PEN (S/)
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Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent liability | $ 10,827,000 | S/ 41,358,000 |  |  |  |  | $ 10,364,000 | S/ 39,590,000 |  |  |  |
Judicial process related to contractor bonuses [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent liability | 1,229,000 | 4,695,000 |  |  |  |  |  |  |  |  |  |
SUNAT. |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Declared tax deductions not recognized |  |  |  |  | $ 4,350,000 | S/ 16,618,000 |  |  |  |  |  |
Contingent liability | $ 2,749,000 | S/ 10,500,000 |  |  |  |  |  |  |  |  |  |
SUNAT. | Open tax procedure |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Declared tax deductions not recognized |  |  | $ 163,000 | S/ 624,000 |  |  |  |  | $ 36,449,000 | S/ 139,235,000 |  |
SUNAT. | Year 2014 [Member] | Open tax procedure |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Declared tax deductions not recognized |  |  |  |  |  |  |  |  |  |  | $ 24,842,000 | S/ 94,898,000

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