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Share-based payments - Vesting period of shares granted under share purchase plan (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
MXN ($)
EquityInstruments
Dec. 31, 2019
MXN ($)
EquityInstruments
Dec. 31, 2018
MXN ($)
EquityInstruments
Dec. 31, 2017
EquityInstruments
Share-based payments        
Compensation expense recorded in the consolidated statement of operations | $ $ 75,040 $ 49,659 $ 19,980  
Forfeited during the year (327,217) (294,541)    
Share purchase plan        
Share-based payments        
Shares outstanding 5,805,311 5,115,191 3,553,295 820,088
Compensation expense recorded in the consolidated statement of operations | $ $ 75,040 $ 49,659 $ 19,980  
Forfeited during the year (327,217) (173,090) (121,451)  
Share purchase plan | Vesting / Exercisable within one year        
Share-based payments        
Shares outstanding 2,979,412      
Share purchase plan | Vesting / Exercisable within two years        
Share-based payments        
Shares outstanding 1,819,440      
Share purchase plan | Vesting / Exercisable within three years        
Share-based payments        
Shares outstanding 1,006,459