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Equity - Additional Information (Detail)
 12 Months Ended 42 Months Ended
Nov. 16, 2017
MXN ($)
$ / shares
Nov. 07, 2017
MXN ($)
$ / shares
Aug. 15, 2017
MXN ($)
$ / shares
Aug. 14, 2017
MXN ($)
$ / shares
May 08, 2017
MXN ($)
Apr. 25, 2017
MXN ($)
$ / shares
Nov. 18, 2016
MXN ($)
$ / shares
Aug. 25, 2016
MXN ($)
$ / shares
May 09, 2016
MXN ($)
Apr. 26, 2016
MXN ($)
$ / shares
Nov. 04, 2015
MXN ($)
$ / shares
Aug. 21, 2015
MXN ($)
$ / shares
May 15, 2015
MXN ($)
Apr. 21, 2015
MXN ($)
$ / shares
Dec. 31, 2017
MXN ($)
Vote
Director
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Feb. 28, 2014
MXN ($)
shares
Apr. 23, 2014
MXN ($)
Disclosure Of Equity [Line Items]                                      
Percentage of acquisition, nominations and compensation corresponding to operating committee members                             20.00%        
Dividend payment per share | $ / shares $ 2.86 $ 2.86 $ 2.86 $ 2.86   $ 5.72 $ 1.79 $ 2.28   $ 4.07 $ 1.50 $ 1.82   $ 3.32          
Dividend payment $ 1,503,146,000 $ 1,503,146,000 $ 1,503,146,000 $ 1,503,146,000     $ 940,780,000 $ 1,198,312,000     $ 788,364,000 $ 956,547,000     $ 3,006,292,000        
Canceled Reserve for repurchase of shares                   $ 950,000,000       $ 850,000,000         $ 400,000,000
Reserve for repurchase of shares                             2,728,374,000 $ 2,683,374,000 $ 2,583,374,000    
Capital reduction per share | $ / shares           $ 3.33       $ 3.33       $ 2.68          
Capital reduction         $ 1,750,167,000 $ 1,750,167,000     $ 1,750,167,000       $ 1,408,542,000   $ 1,750,167,000 1,750,167,000 1,408,542,000    
Description of legal reserves                             The 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                             $ 1,119,029,000 $ 960,943,000 $ 840,743,000    
Percentage of legal reserve                             12.40% 8.90% 6.70%    
Maximum amount of repurchase shares                             $ 2,728,374,000        
Repurchases of shares amount                                   $ 1,733,374,000  
Remaining Shares on repurchased                             $ 995,000,000        
Number of shares repurchased | shares                                   35,424,453  
Additional income tax on dividend                             10.00%        
Top of Range [Member]                                      
Disclosure Of Equity [Line Items]                                      
Reserve for repurchase of shares                   $ 995,000,000       $ 950,000,000         $ 850,000,000
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%        
Percentage of voting rights                             10.00%