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Share-based payments - Vesting period of shares granted under share purchase plan (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
MXN ($)
EquityInstruments
Dec. 31, 2018
MXN ($)
EquityInstruments
Dec. 31, 2017
MXN ($)
EquityInstruments
Dec. 31, 2016
EquityInstruments
Share-based payments        
Compensation expense recorded in the consolidated statement of operations | $ $ 49,659 $ 19,980 $ 13,508  
Forfeited during the year (294,541) (121,451)    
Share purchase plan        
Share-based payments        
Shares outstanding 5,115,191 3,553,295 820,088 618,048
Compensation expense recorded in the consolidated statement of operations | $ $ 49,659 $ 19,980 $ 13,508  
Forfeited during the year (173,090) (121,451)    
Share purchase plan | Vesting / Exercisable within one year        
Share-based payments        
Shares outstanding 2,211,269      
Share purchase plan | Vesting / Exercisable within two years        
Share-based payments        
Shares outstanding 2,005,716      
Share purchase plan | Vesting / Exercisable within three years        
Share-based payments        
Shares outstanding 898,206