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Employee Benefits - Summary of Long-Term Direct Employee Benefits (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of long term direct employee benefits [abstract]    
Beginning balance $ 8,175,767 $ 8,111,778
Effect of translation 1,256,880 (518,180)
Increase of the year 1,729,392 2,528,224
Applications, Payments (2,411,436) (1,946,055)
Ending balance $ 8,750,603 $ 8,175,767