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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 ($)
EquityInstruments
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Dec. 31, 2017
MXN ($)
Share-based payments            
Cost of MIP related to the vested shares       $ 93,916,000 $ 51,044,000  
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
Cost of MIP related to the vested shares         $ 327,000  
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