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Share-based payments - MIP I, movement in share options (Details) - MIP I
$ in Thousands
 12 Months Ended
Dec. 31, 2020
$ / shares
Dec. 31, 2020
MXN ($)
EquityInstruments
Dec. 31, 2019
$ / shares
Dec. 31, 2019
MXN ($)
EquityInstruments
Share-based payments        
Outstanding at beginning of the year (shares) | EquityInstruments   7,653,981   10,433,981
Exercised during the year (shares) | EquityInstruments       (2,780,000)
Outstanding at end of the year (shares) | EquityInstruments   7,653,981   7,653,981
Outstanding at the beginning of the year (Exercise price) | $ / shares $ 5.31   $ 5.31  
Exercise during the year (Exercise price) | $ / shares     5.31  
Outstanding at end of the year (Exercise price) | $ / shares $ 5.31   $ 5.31  
Outstanding at beginning of the year (Total) | $   $ 40,668   $ 55,441
Exercised during the year (Total) | $       (14,773)
Outstanding at end of the year (Total) | $   $ 40,668   $ 40,668