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Share-based payments - MIP I, movement in share options (Details) - MIP I
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
MXN ($)
EquityInstruments
$ / shares
Dec. 31, 2021
USD ($)
EquityInstruments
Dec. 31, 2020
MXN ($)
EquityInstruments
$ / shares
Share-based payments      
Outstanding at beginning of the year (shares) | EquityInstruments 7,653,981 7,653,981 7,653,981
Granted during the year (shares) | EquityInstruments 0 0  
Forfeited during the year (shares) | EquityInstruments 0 0  
Exercised during the year (shares) | EquityInstruments (7,653,981) (7,653,981)  
Outstanding at end of the year (shares) | EquityInstruments     7,653,981
Outstanding at the beginning of the year (Exercise price) | $ / shares $ 5.31   $ 5.31
Granted during the year (Exercise price) | $ / shares 0    
Forfeited during the year (Exercise price)   $ 0  
Exercise during the year (Exercise price) | $ / shares $ 5.31    
Outstanding at end of the year (Exercise price) | $ / shares     $ 5.31
Outstanding at beginning of the year (Total) $ 40,668   $ 40,668
Granted during the year (Total) 0    
Forfeited during the year (Total) 0    
Exercised during the year (Total) $ (40,668)    
Outstanding at end of the year (Total)     $ 40,668