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Share-based payments - Vesting period of shares granted under share purchase plan (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
MXN ($)
EquityInstruments
Dec. 31, 2017
MXN ($)
EquityInstruments
Dec. 31, 2016
MXN ($)
EquityInstruments
Dec. 31, 2015
EquityInstruments
Share-based payments        
Compensation expense recorded in the consolidated statement of operations | $ $ 19,980 $ 13,508 $ 7,816  
Forfeited during the year (121,451)      
Share purchase plan        
Share-based payments        
Shares outstanding 3,553,295 820,088 618,048 617,001
Compensation expense recorded in the consolidated statement of operations | $ $ 19,980 $ 13,508 $ 7,816  
Forfeited during the year (121,451)   (86,419)  
Share purchase plan | Vesting / Exercisable within one year        
Share-based payments        
Shares outstanding 1,284,373      
Share purchase plan | Vesting / Exercisable within two years        
Share-based payments        
Shares outstanding 1,207,862      
Share purchase plan | Vesting / Exercisable within three years        
Share-based payments        
Shares outstanding 1,061,060