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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, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($)
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, entity's own equity instruments [line items] |  |  |  |
Net (loss) income for the period | $ (215,242) | $ (4,293,791) | $ 2,639,063 | $ (942,882)
Covid [Member] |  |  |  |
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, entity's own equity instruments [line items] |  |  |  |
Net (loss) income for the period |  | 111 |  |
Comprehensive income |  | $ 94 |  |
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 |  | $ (253,763) | $ (155,593) |
Effect on profit before tax from reasonably possible decrease in exchange rate |  | $ 253,763 | $ 155,593 |

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