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Post-employment Benefits - Plan assets (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Post-employment benefit plans    
Minimum investment required (as a percent) 30.00%  
Weighted average asset allocation (as a percent) 100.00% 100.00%
Fair value os plan assets held by the trust $ 227,004 $ 265,599
Weighted average expected long-term rate of return of plan assets 7.60% 6.70%
Minimum    
Post-employment benefit plans    
Term for liquidity of mutual funds 1 day  
Maximum    
Post-employment benefit plans    
Term for liquidity of mutual funds 1 month  
Equity securities    
Post-employment benefit plans    
Target allocation (as a percent) 20.00%  
Weighted average asset allocation (as a percent) 29.60% 28.20%
Fixed rate instruments    
Post-employment benefit plans    
Target allocation (as a percent) 80.00%  
Weighted average asset allocation (as a percent) 70.40% 71.80%