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Share-based payments - Share purchase plan (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Nov. 11, 2014
MXN ($)
Nov. 30, 2018
MXN ($)
Nov. 30, 2017
MXN ($)
Oct. 31, 2016
MXN ($)
Apr. 30, 2016
MXN ($)
Nov. 30, 2014
MXN ($)
Dec. 31, 2018
EquityInstruments
shares
Dec. 31, 2017
EquityInstruments
shares
Dec. 31, 2016
EquityInstruments
shares
Share purchase plan                  
Forfeited during the year             (121,451)    
Share purchase plan                  
Share purchase plan                  
Special bonus granted | $           $ 10,831      
Special bonus net of withheld taxes | $ $ 7,059                
Cost of extensions to LTIP approved | $   $ 63,961 $ 15,765 $ 11,599 $ 14,532        
Cost of extensions net of withheld taxes | $   $ 41,590 $ 10,108 $ 7,559 $ 9,466        
Outstanding at beginning of the year             820,088 618,048 617,001
Purchased during the year | shares             3,208,115 547,310 513,002
Exercised/vested during the year             (353,457) (345,270) (425,536)
Forfeited during the year             (121,451)   (86,419)
Outstanding at end of the year             3,553,295 820,088 618,048