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Share-based payments - Expense (benefit) recognized in retention plans (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based payments      
(Benefit) arising from cash-settled share-based payments transactions   $ (5,238) $ (25,498)
Expense arising from cash-settled share-based payments transactions $ 40,724    
Expense arising from equity-settled share-based payments transactions 49,659 19,980 13,508
Total expense arising from share-based payments transactions $ 90,383 $ 14,742  
Total (benefit) arising from share-based payments transactions     $ (11,990)