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Share-based payments - Board of Directors Incentive Plan (BODIP) (Details) - BODIP
1 Months Ended 12 Months Ended
Apr. 30, 2018
USD ($)
Dec. 31, 2018
MXN ($)
EquityInstruments
Dec. 31, 2017
MXN ($)
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Vesting period 4 years    
Exercise price $ 16.12 $ 16.12 $ 26.29
Shares available to be exercised   1,103,638