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Share-based payments - MIP I (Details)
12 Months Ended
Dec. 27, 2012
MXN ($)
Dec. 24, 2012
MXN ($)
Dec. 21, 2012
MXN ($)
EquityInstruments
Dec. 31, 2018
MXN ($)
Dec. 31, 2016
MXN ($)
Share-based payments          
Cost of MIP related to the vested shares       $ 14,742,000 $ 93,916,000
MIP I          
Share-based payments          
Exercise price of shares   $ 5.31      
Amount borrowed by trust $ 133,723,000        
Maximum term of share options   10 years      
Total cost of MIP determined       $ 2,722,000  
Series A and B shares | MIP I          
Share-based payments          
Number of instruments granted in share-based payment arrangement | EquityInstruments     25,164,126    
Shares issued as a percentage of diluted capital stock     3.00%    
Exercise price of shares     $ 5.31