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Financial instruments and risk management - Foreign currency sensitivity (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
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