XML 121 R107.htm IDEA: XBRL DOCUMENT v3.8.0.1
Share-based payments - Share purchase plan (Details) - Share purchase plan
$ in Thousands
 1 Months Ended 12 Months Ended
Nov. 11, 2014
MXN ($)
Nov. 30, 2017
MXN ($)
Oct. 31, 2016
MXN ($)
Apr. 30, 2016
MXN ($)
Nov. 30, 2014
MXN ($)
Dec. 31, 2017
EquityInstruments
shares
Dec. 31, 2016
EquityInstruments
shares
Share purchase plan              
Special bonus granted | $         $ 10,831    
Special bonus net of withheld taxes | $ $ 7,059            
Cost of extensions to LTIP approved | $   $ 15,765 $ 11,599 $ 14,532      
Cost of extensions net of withheld taxes | $   $ 10,108 $ 7,559 $ 9,466      
Outstanding at beginning of the year | EquityInstruments           618,048 617,001
Purchased during the year | shares           547,310 513,002
Exercised/vested during the year | EquityInstruments           (345,270) (425,536)
Forfeited during the year | EquityInstruments             (86,419)
Outstanding at end of the year | EquityInstruments           820,088 618,048