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Post-employment Benefits - Benefit obligation (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Post-employment pension plans.    
Beginning of year $ 520,473 $ 407,179
Service cost 132,055 125,952
Interest cost 149,100 144,465
Benefits paid (247,940) (115,882)
Past service cost 2,405 (195,396)
End of year 716,095 520,473
Pensions    
Post-employment pension plans.    
Beginning of year 684,733  
Benefits paid (154,921)  
End of year 733,294 684,733
Seniority Premiums    
Post-employment pension plans.    
Beginning of year (164,260)  
Benefits paid (93,019)  
End of year (17,199) (164,260)
Defined benefit obligation    
Post-employment pension plans.    
Beginning of year 2,514,235 2,471,725
Service cost 132,055 125,952
Interest cost 149,100 144,465
Benefits paid (569,490) (244,560)
Remeasurement of post-employment benefit obligations 190,848 212,049
Past service cost 2,405 (195,396)
End of year 2,419,153 2,514,235
Defined benefit obligation | Pensions    
Post-employment pension plans.    
Beginning of year 2,066,629  
Service cost 83,246  
Interest cost 120,737  
Benefits paid (307,645)  
Remeasurement of post-employment benefit obligations 11,059  
End of year 1,974,026 2,066,629
Defined benefit obligation | Seniority Premiums    
Post-employment pension plans.    
Beginning of year 447,606  
Service cost 48,809  
Interest cost 28,363  
Benefits paid (261,845)  
Remeasurement of post-employment benefit obligations 179,789  
Past service cost 2,405  
End of year $ 445,127 $ 447,606