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Share-based payments - (Benefit) expense recognized in retention plan (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based payments      
(Benefit) arising from cash-settled share-based payments transactions $ (25,498)    
Expense arising from cash-settled share-based payments transactions   $ 86,100 $ 44,699
Expense arising from equity-settled share-based payments transactions 13,508 7,816 6,345
Total (benefit) arising from share-based payments transactions $ (11,990)    
Total expense arising from share-based payments transactions   $ 93,916 $ 51,044