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Post-employment Benefits - Changes in net post-employment (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Post-employment pension plans.    
Beginning of year $ 520,473 $ 407,179
Net periodic cost 158,905 (53,344)
Remeasurement adjustments 284,657 282,520
Benefits paid (247,940) (115,882)
End of year 716,095 520,473
Pensions    
Post-employment pension plans.    
Beginning of year 684,733  
Net periodic cost 118,553  
Remeasurement adjustments 84,929 181,161
Benefits paid (154,921)  
End of year 733,294 684,733
Seniority Premiums    
Post-employment pension plans.    
Beginning of year (164,260)  
Net periodic cost 40,352  
Remeasurement adjustments 199,728 101,359
Benefits paid (93,019)  
End of year $ (17,199) $ (164,260)