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Equity - Additional Information (Detail)
 12 Months Ended 42 Months Ended
Nov. 20, 2019
MXN ($)
$ / shares
Aug. 29, 2019
MXN ($)
$ / shares
May 17, 2019
MXN ($)
Apr. 23, 2019
MXN ($)
$ / shares
Nov. 20, 2018
MXN ($)
$ / shares
Aug. 21, 2018
MXN ($)
$ / shares
May 11, 2018
MXN ($)
Apr. 25, 2018
MXN ($)
$ / shares
Dec. 31, 2020
MXN ($)
Vote
Director
Member
shares
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Feb. 28, 2014
MXN ($)
shares
Apr. 23, 2020
MXN ($)
Apr. 25, 2017
MXN ($)
Disclosure Of Equity [Line Items]                            
Percentage of acquisition, nominations and compensation corresponding to operating committee members                 20.00%          
Dividend payment per share | $ / shares $ 4.21 $ 4.21   $ 8.42 $ 3.81 $ 3.81   $ 7.62            
Dividend payment $ 2,212,673,000 $ 2,212,673,000     $ 2,002,443,000 $ 2,002,443,000                
Canceled reserve for repurchase of shares       $ 1,550,000,000       $ 1,250,000,000           $ 995,000,000
Reserve for repurchase of shares                 $ 3,283,374,000 $ 3,283,374,000 $ 2,983,374,000   $ 1,550,000  
Capital reduction per share | $ / shares       $ 3.03       $ 2.38            
Capital reduction     $ 1,592,494,000       $ 1,250,870,000     1,592,494,000 1,250,870,000      
Description of legal reserves                 General Corporate Law requires that at least 5% of the unconsolidated net income of the year, be transferred to the legal reserve until the reserve equals 20% of capital stock at par value (nominal pesos).          
Legal reserve                 $ 1,592,551,000 $ 1,592,551,000 $ 1,345,709,000      
Percentage of legal reserve                 25.70% 25.70% 17.30%      
Maximum amount of repurchase shares                 $ 3,283,374,000          
Repurchases of shares amount                       $ 1,733,374,000    
Remaining Shares on repurchased                 $ 1,550,000,000          
Number of shares repurchased | shares                 0     35,424,453    
Non-Mexican and individual shareholders [Member]                            
Disclosure Of Equity [Line Items]                            
Additional income tax on dividend                 10.00%          
Top of Range [Member]                            
Disclosure Of Equity [Line Items]                            
Reserve for repurchase of shares       $ 1,550,000,000       $ 1,550,000,000         $ 1,550,000 $ 1,250,000,000
Series BB common stock [Member]                            
Disclosure Of Equity [Line Items]                            
Percentage of common stock                 15.00%          
Number of directors | Director                 4          
Series B And BB Common Stock [Member]                            
Disclosure Of Equity [Line Items]                            
Number of vote per share | Vote                 1          
Maximum percentage of common stock                 10.00%          
Percentage of not having voting rights                 10.00%          
Series B common stock [Member]                            
Disclosure Of Equity [Line Items]                            
Percentage of common stock                 10.00%          
Number of directors | Director                 11          
Percentage of voting rights                 10.00%          
Right to appoint members number | Member                 7          
Number of members elected to the board of directors at a Shareholders' Meeting | Member                 1