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Retained Earnings and Accumulated Other Comprehensive Income - Legal Reserve (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Retained Earnings and Accumulated Other Comprehensive Income      
Increase in legal reserve as a percentage of annual net profits 5.00%    
Threshold increase in legal reserve as a percentage of capital stock 20.00%    
Statutory reserve $ 2,139,007 $ 2,139,007  
Increase in legal reserve as percentage of capital stock 20.00%    
Additional increase in legal reserve as a percentage 0.00% 0.00% 0.00%