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Shareholders' Equity - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 4 Months Ended 12 Months Ended
Apr. 09, 2019
$ / shares
Apr. 16, 2018
$ / shares
Nov. 11, 2019
$ / shares
Dec. 31, 2019
MXN ($)
shares
Dec. 31, 2018
MXN ($)
shares
Disclosure of classes of share capital [line items]          
Capital requirements | $       $ 270,049  
Number of shares issued       71,063,212,170  
Number of shares outstanding       66,004,214,830 66,034,792,526
Number of treasury shares held       5,058,997,340 5,028,419,644
Merger transaction description       any transaction representing 20% or more of the Company’s consolidated assets  
Legal reserve | $       $ 358,440 $ 358,440
Amount of Mexican withholding tax       10.00%  
Bottom of range [member] | Legal reserve [member]          
Disclosure of classes of share capital [line items]          
Increase in legal reserve       5.00%  
Top of range [member] | Legal reserve [member]          
Disclosure of classes of share capital [line items]          
Increase in legal reserve       20.00%  
Capital Stock Class AA Voting Rights [member]          
Disclosure of classes of share capital [line items]          
Number of shares issued       20,601,632,660  
Capital Stock Class A Voting Rights [member]          
Disclosure of classes of share capital [line items]          
Number of shares issued       530,585,278  
Capital Stock Class L Limited Voting Rights [member]          
Disclosure of classes of share capital [line items]          
Number of shares issued       49,930,994,232  
Capital Stock Class Aa [member]          
Disclosure of classes of share capital [line items]          
Number of shares outstanding       20,601,632,660 20,601,632,660
Dividends paid | $ / shares $ 0.35 $ 0.32      
Capital Stock Class Aa [member] | Bottom of range [member]          
Disclosure of classes of share capital [line items]          
Percentage of capital stock       20.00%  
Capital Stock Class Aa [member] | Top of range [member]          
Disclosure of classes of share capital [line items]          
Percentage of capital stock       51.00%  
Capital Stock Class A [member]          
Disclosure of classes of share capital [line items]          
Number of shares outstanding       530,563,378 546,112,938
Dividends paid | $ / shares 0.35 0.32      
Capital Stock Class A [member] | Bottom of range [member]          
Disclosure of classes of share capital [line items]          
Percentage of capital stock       19.60%  
Capital Stock Class A [member] | Top of range [member]          
Disclosure of classes of share capital [line items]          
Percentage of capital stock       49.00%  
Capital Stock Class L [member]          
Disclosure of classes of share capital [line items]          
Number of shares outstanding       44,872,018,792 44,887,046,928
Dividends paid | $ / shares 0.35 0.32      
Periodic payment of dividend | (per share) $ 0.18 $ 0.16 $ 0.17    
Periodic payable date of dividend July 15 and November 11        
Capital Stock Class L [member] | Top of range [member]          
Disclosure of classes of share capital [line items]          
Percentage of capital stock       80.00%  
Class L [member]          
Disclosure of classes of share capital [line items]          
Number of treasury shares held       (5,058,975,440) (5,028,399,396)
Class A [member]          
Disclosure of classes of share capital [line items]          
Number of treasury shares held       21,900 20,248