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Share-based payments - MIP I, movement in share options (Details) - MIP I
 12 Months Ended
Dec. 31, 2018
MXN ($)
EquityInstruments
Dec. 31, 2017
MXN ($)
EquityInstruments
Dec. 31, 2016
MXN ($)
EquityInstruments
Share-based payments      
Outstanding at beginning of the year (shares) | EquityInstruments 12,437,857 12,557,857 15,857,856
Exercised during the year (shares) | EquityInstruments (2,003,876) (120,000) (3,299,999)
Outstanding at end of the year (shares) | EquityInstruments 10,433,981 12,437,857 12,557,857
Outstanding at beginning of the year (Exercise price) $ 5.31 $ 5.31 $ 5.31
Exercised during the year (Exercise price) 5.31 5.31 5.31
Outstanding at end of the year (Exercise price) 5.31 5.31 5.31
Outstanding at beginning of the year (Total) 66,095,000 66,733,000 84,269,000
Exercised during the year (Total) (10,654,000) (638,000) (17,536,000)
Outstanding at end of the year (Total) $ 55,441,000 $ 66,095,000 $ 66,733,000