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Share-based payments - Share purchase plan (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Nov. 11, 2014
MXN ($)
Nov. 30, 2021
MXN ($)
Nov. 30, 2020
MXN ($)
Nov. 30, 2019
MXN ($)
Nov. 30, 2014
MXN ($)
Dec. 31, 2021
EquityInstruments
shares
Dec. 31, 2020
EquityInstruments
shares
Dec. 31, 2019
EquityInstruments
shares
Share purchase plan                
Forfeited during the year           (551,732) (327,217)  
Share purchase plan                
Share purchase plan                
Special bonus granted | $         $ 10,831      
Special bonus net of withheld taxes | $ $ 7,059              
Cost of extensions to LTIP approved | $   $ 104,698 $ 92,132 $ 86,772        
Cost of extensions net of withheld taxes | $   $ 68,066 $ 59,899 $ 56,407        
Outstanding at beginning of the year           5,805,311 5,115,191 3,553,295
Purchased during the year | shares           1,849,417 3,159,763 2,694,600
Exercised/vested during the year           (2,612,575) (2,142,426) (959,614)
Forfeited during the year           (551,732) (327,217) (173,090)
Outstanding at end of the year           4,490,421 5,805,311 5,115,191