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Significant Accounting Policies - Disclosure of Exchange Rates of Local Currencies Translated to Mexican Pesos (Detail)
 12 Months Ended
Dec. 31, 2018
$ / $
Dec. 31, 2017
Dec. 31, 2016
Disclosure of significant accounting policies [line items]      
Exchange Rate as of 19.6350    
Guatemala [member] | Guatemala, Quetzal [member]      
Disclosure of significant accounting policies [line items]      
Functional / Recording Currency Quetzal    
Average Exchange Rate for 2.56 2.57 2.46
Exchange Rate as of 2.54 2.69  
Costa Rica [member] | Costa Rica, Colon [member]      
Disclosure of significant accounting policies [line items]      
Functional / Recording Currency Colon    
Average Exchange Rate for 0.03 0.03 0.03
Exchange Rate as of 0.03 0.03  
Panama [member] | U S dollar [member]      
Disclosure of significant accounting policies [line items]      
Functional / Recording Currency U.S. dollar    
Average Exchange Rate for 19.24 18.93 18.66
Exchange Rate as of 19.68 19.74  
Colombia [member] | Colombian peso [member]      
Disclosure of significant accounting policies [line items]      
Functional / Recording Currency Colombian peso    
Average Exchange Rate for 0.01 0.01 0.01
Exchange Rate as of 0.01 0.01  
Nicaragua [member] | Nicaragua, Cordoba [member]      
Disclosure of significant accounting policies [line items]      
Functional / Recording Currency Cordoba    
Average Exchange Rate for 0.62 0.63 0.65
Exchange Rate as of 0.61 0.64  
Argentina [member] | Argentine peso [member]      
Disclosure of significant accounting policies [line items]      
Functional / Recording Currency Argentine peso    
Average Exchange Rate for 0.73 1.15 1.26
Exchange Rate as of 0.52 1.06  
Venezuela [member] | Venezuelan bolivar fuerte [member]      
Disclosure of significant accounting policies [line items]      
Functional / Recording Currency Bolivar    
Brazil [member] | Brazilian reais [member]      
Disclosure of significant accounting policies [line items]      
Functional / Recording Currency Reais    
Average Exchange Rate for 5.29 5.94 5.39
Exchange Rate as of 5.08 5.97  
Chile [member] | Chilean peso [member]      
Disclosure of significant accounting policies [line items]      
Functional / Recording Currency Chilean peso    
Average Exchange Rate for 0.03 0.03 0.03
Exchange Rate as of 0.03 0.03  
Euro Zone [member] | Euro [member]      
Disclosure of significant accounting policies [line items]      
Functional / Recording Currency Euro (€)    
Average Exchange Rate for 22.71 21.32 20.66
Exchange Rate as of 22.54 23.57  
Peru [member] | Peru, Nuevo Sol [member]      
Disclosure of significant accounting policies [line items]      
Functional / Recording Currency Nuevo Sol    
Average Exchange Rate for 5.85 5.78 5.53
Exchange Rate as of 5.83 6.08  
Ecuador [member] | U S dollar [member]      
Disclosure of significant accounting policies [line items]      
Functional / Recording Currency U.S. dollar    
Average Exchange Rate for 19.24 18.93 18.66
Exchange Rate as of 19.68 19.74  
Philippines [member] | Philippine peso [member]      
Disclosure of significant accounting policies [line items]      
Functional / Recording Currency Philippine peso    
Average Exchange Rate for 0.37 0.38 0.39
Exchange Rate as of 0.37 0.40  
Uruguay [member] | Uruguay Peso en Unidades Indexadas (UPUI) [member]      
Disclosure of significant accounting policies [line items]      
Functional / Recording Currency Uruguayan peso    
Average Exchange Rate for 0.63 0.66 0.71
Exchange Rate as of 0.61 0.69