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Share-based payments - SARs (cash settled) (Details)
$ in Thousands
12 Months Ended
Nov. 06, 2014
MXN ($)
EquityInstruments
Dec. 31, 2018
MXN ($)
EquityInstruments
Dec. 31, 2017
MXN ($)
EquityInstruments
Dec. 31, 2016
MXN ($)
EquityInstruments
Share-based payments        
Compensation (benefit) recorded in the consolidated statement of operations   $ (5,238) $ (25,498)  
Compensation expense recorded in the consolidated statement of operations       $ 86,100
SARs - cash settled        
Share-based payments        
Granted | EquityInstruments 4,315,264 0 3,965,351 2,044,604
Vesting period 3 years 3 years 3 years 3 years
Total amount granted $ 10,831 $ 0 $ 15,765 $ 14,532
Carrying amount of the liability   537 723 15,744
Compensation (benefit) recorded in the consolidated statement of operations   $ (186) $ (8,999)  
Compensation expense recorded in the consolidated statement of operations       $ 31,743