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Share-based payments - MIP II (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
MXN ($)
EquityInstruments
Dec. 31, 2017
MXN ($)
EquityInstruments
Dec. 31, 2016
MXN ($)
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    
MIP II      
Share-based payments      
Vesting period 5 years    
Extension of vesting period 5 years    
Carrying amount of the liability | $ $ 32,807 37,858 54,357
Compensation expense recorded in the consolidated statement of operations | $     $ 54,357
Compensation (benefit) recorded in the consolidated statement of operations | $ $ (5,052) $ (16,499)  
Exercised during the year (shares) 0    
Granted 7,912,360    
Forfeited during the year 1,563,520 0 0
MIP II | Vesting / Exercisable within one year      
Share-based payments      
Granted 1,695,500    
MIP II | Vesting / Exercisable within two years      
Share-based payments      
Granted 2,825,840    
MIP II | Vesting / Exercisable within five years      
Share-based payments      
Granted 3,391,020