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Commitments and contingencies - Income tax declaration for 2013 (Details) |  | 12 Months Ended |  |  |  |  |  |  |
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Oct. 05, 2021 USD ($) | Oct. 05, 2021 PEN (S/) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 PEN (S/) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 PEN (S/) | Dec. 31, 2022 PEN (S/) | Dec. 28, 2022 USD ($) | 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 ($) | Mar. 15, 2021 PEN (S/) | Nov. 17, 2020 USD ($) | Nov. 17, 2020 PEN (S/) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 PEN (S/)
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of tax debt |  |  | $ 797,310,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent liability |  |  | 10,827,000 |  |  |  | S/ 41,358,000 |  |  |  |  | $ 10,364,000 | S/ 39,590,000 |  |  |  |  |  |
Non-recognition of investment in development costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disallowance of bonus paid to contractors | $ 1,185,000 | S/ 4,526,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  | 10,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Deductible temporary differences for which no deferred tax asset is recognised |  |  |  |  |  |  |  |  |  | $ 4,350,000 | S/ 16,618,000 |  |  |  |  |  |  |  |
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 |  |  |  |
Payments of tax debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,246,000 | S/ 4,744,000 |  |
Deductible temporary differences for which no deferred tax asset is recognised |  |  |  |  |  |  |  | $ 163,000 | S/ 624,000 |  |  |  |  | $ 36,449,000 | S/ 139,235,000 |  |  |  |
SUNAT. | Year 2013 [Member] | Open tax procedure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent liability |  |  | 15,160,000 |  |  |  | 57,909,000 |  |  |  |  | $ 14,520,000 | S/ 55,465,000 |  |  |  |  |  |
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
Disallowance of bonus paid to contractors |  |  |  |  | $ 541,000 | S/ 2,067,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Deductible temporary differences for which no deferred tax asset is recognised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 24,842,000 | S/ 94,898,000
SUNAT. | Ifrs Tax Year 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of tax debt |  |  | 4,579,000 | S/ 17,493,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of tax liability paid |  |  | 2,426,000 | S/ 9,266,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount related to unaccepted repairs |  |  | 2,400,000 |  |  |  | 9,224,000 |  |  |  |  |  |  |  |  |  |  |  |
SUNAT. | Ifrs Tax Year 2017 [Member] | Non-recognition of investment in development costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declared tax deductions not recognized |  |  | 10,398,000 |  |  |  | 39,720,000 |  |  |  |  |  |  |  |  |  |  |  |
Deductible temporary differences for which no deferred tax asset is recognised |  |  | 10,398,000 |  |  |  | 39,720,000 |  |  |  |  |  |  |  |  |  |  |  |
SUNAT. | Ifrs Tax Year 2017 [Member] | Non-recognition of the compensation of carry-over tax losses from previous years [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Services of related parties not recognised |  |  | 33,489,000 |  |  |  | 127,929,000 |  |  |  |  |  |  |  |  |  |  |  |
SUNAT. | Ifrs Tax Year 2017 [Member] | Declaration of transfer prices and the operations between related parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Services of related parties not recognised |  |  | $ 875,000 |  |  |  | S/ 3,341,000 |  |  |  |  |  |  |  |  |  |  |  |

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