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Share-based payments - Vesting period of shares granted under share purchase plan (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
MXN ($)
EquityInstruments
Dec. 31, 2020
MXN ($)
EquityInstruments
Dec. 31, 2019
MXN ($)
EquityInstruments
Dec. 31, 2018
EquityInstruments
Share-based payments        
Compensation expense recorded in the consolidated statement of operations | $ $ 89,464 $ 75,040 $ 49,659  
Forfeited during the year (551,732) (327,217)    
Share purchase plan        
Share-based payments        
Shares outstanding 4,490,421 5,805,311 5,115,191 3,553,295
Compensation expense recorded in the consolidated statement of operations | $ $ 89,464 $ 75,040 $ 49,659  
Forfeited during the year (551,732) (327,217) (173,090)  
Share purchase plan | Vesting / Exercisable within one year        
Share-based payments        
Shares outstanding 2,408,277      
Share purchase plan | Vesting / Exercisable within two years        
Share-based payments        
Shares outstanding 1,485,802      
Share purchase plan | Vesting / Exercisable within three years        
Share-based payments        
Shares outstanding 596,342