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Share-based payments - SARs (cash settled) (Details)
$ in Thousands
12 Months Ended
Nov. 06, 2014
MXN ($)
EquityInstruments
Dec. 31, 2017
MXN ($)
EquityInstruments
Dec. 31, 2016
MXN ($)
EquityInstruments
Dec. 31, 2015
MXN ($)
EquityInstruments
Share-based payments        
Compensation (benefit) recorded in the consolidated statement of operations   $ (25,498)    
Compensation expense recorded in the consolidated statement of operations     $ 86,100 $ 44,699
SARs - cash settled        
Share-based payments        
Granted | EquityInstruments 4,315,264 3,965,351 2,044,604 1,793,459
Vesting period 3 years 3 years 3 years 3 years
Total amount granted $ 10,831 $ 15,765 $ 14,532 $ 11,599
Carrying amount of the liability   723 15,744  
Compensation (benefit) recorded in the consolidated statement of operations   $ (8,999)    
Compensation expense recorded in the consolidated statement of operations     $ 31,743 $ 44,699