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Financial instruments and risk management - Foreign currency sensitivity (Details) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) | Dec. 31, 2021 MXN ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($)
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, entity's own equity instruments [line items] |  |  |  |
Net income (loss) for the period | $ 103,022 | $ 2,120,551 | $ (4,293,791) | $ 2,639,063
USD | Foreign currency | Fair value |  |  |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, entity's own equity instruments [line items] |  |  |  |
Percentage of reasonably possible increase in exchange rate | 5.00% | 5.00% | 5.00% |
Percentage of reasonably possible decrease in exchange rate | (5.00%) | (5.00%) | (5.00%) |
Effect on profit before tax from reasonably possible increase in exchange rate |  | $ (1,439,653) | $ (253,763) |
Effect on profit before tax from reasonably possible decrease in exchange rate |  | $ 1,439,653 | $ 253,763 |
Denominated in Mexican pesos | Foreign currency | Fair value |  |  |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, entity's own equity instruments [line items] |  |  |  |
Percentage of reasonably possible increase in exchange rate | 5.00% | 5.00% |  |
Percentage of reasonably possible decrease in exchange rate | (5.00%) | (5.00%) |  |
Effect on profit before tax from reasonably possible increase in exchange rate |  | $ (69,942) |  |
Effect on profit before tax from reasonably possible decrease in exchange rate |  | $ 69,942 |  |

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