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Significant Accounting Policies - Summary of cumulative inflation (Detail)
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
2015-2018 [member] | Mexico [member] | Nonhyperinflationary [member]    
Disclosure Of Cumulative Inflation [line items]    
Cumulative inflation percentage   15.70%
Type of Economy   Non-hyperinflationary
2015-2018 [member] | Guatemala [member] | Nonhyperinflationary [member]    
Disclosure Of Cumulative Inflation [line items]    
Cumulative inflation percentage   12.20%
Type of Economy   Non-hyperinflationary
2015-2018 [member] | Costa Rica [member] | Nonhyperinflationary [member]    
Disclosure Of Cumulative Inflation [line items]    
Cumulative inflation percentage   5.70%
Type of Economy   Non-hyperinflationary
2015-2018 [member] | Panama [member] | Nonhyperinflationary [member]    
Disclosure Of Cumulative Inflation [line items]    
Cumulative inflation percentage   2.10%
Type of Economy   Non-hyperinflationary
2015-2018 [member] | Colombia [member] | Nonhyperinflationary [member]    
Disclosure Of Cumulative Inflation [line items]    
Cumulative inflation percentage   13.40%
Type of Economy   Non-hyperinflationary
2015-2018 [member] | Nicaragua [member] | Nonhyperinflationary [member]    
Disclosure Of Cumulative Inflation [line items]    
Cumulative inflation percentage   13.10%
Type of Economy   Non-hyperinflationary
2015-2018 [member] | Argentina [member] | Nonhyperinflationary [member]    
Disclosure Of Cumulative Inflation [line items]    
Cumulative inflation percentage   158.40%
Type of Economy   Non-hyperinflationary
2015-2018 [member] | Brazil [member] | Nonhyperinflationary [member]    
Disclosure Of Cumulative Inflation [line items]    
Cumulative inflation percentage   13.10%
Type of Economy   Non-hyperinflationary
2015-2018 [member] | Philippinnes [member] | Nonhyperinflationary [member]    
Disclosure Of Cumulative Inflation [line items]    
Cumulative inflation percentage   11.90%
Type of Economy   Non-hyperinflationary
2015-2018 [member] | Uruguay | Nonhyperinflationary [member]    
Disclosure Of Cumulative Inflation [line items]    
Cumulative inflation percentage   25.30%
Type of Economy   Non-hyperinflationary
2016- 2019 [member] | Mexico [member] | Nonhyperinflationary [member]    
Disclosure Of Cumulative Inflation [line items]    
Cumulative inflation percentage 15.10%  
Type of Economy Non-hyperinflationary  
2016- 2019 [member] | Guatemala [member] | Nonhyperinflationary [member]    
Disclosure Of Cumulative Inflation [line items]    
Cumulative inflation percentage 10.30%  
Type of Economy Non-hyperinflationary  
2016- 2019 [member] | Costa Rica [member] | Nonhyperinflationary [member]    
Disclosure Of Cumulative Inflation [line items]    
Cumulative inflation percentage 6.00%  
Type of Economy Non-hyperinflationary  
2016- 2019 [member] | Panama [member] | Nonhyperinflationary [member]    
Disclosure Of Cumulative Inflation [line items]    
Cumulative inflation percentage 0.90%  
Type of Economy Non-hyperinflationary  
2016- 2019 [member] | Colombia [member] | Nonhyperinflationary [member]    
Disclosure Of Cumulative Inflation [line items]    
Cumulative inflation percentage 11.60%  
Type of Economy Non-hyperinflationary  
2016- 2019 [member] | Nicaragua [member] | Nonhyperinflationary [member]    
Disclosure Of Cumulative Inflation [line items]    
Cumulative inflation percentage 15.80%  
Type of Economy Non-hyperinflationary  
2016- 2019 [member] | Argentina [member] | Hyperinflationary [member]    
Disclosure Of Cumulative Inflation [line items]    
Cumulative inflation percentage 166.20%  
Type of Economy Hyperinflationary  
2016- 2019 [member] | Brazil [member] | Nonhyperinflationary [member]    
Disclosure Of Cumulative Inflation [line items]    
Cumulative inflation percentage 10.00%  
Type of Economy Non-hyperinflationary  
2016- 2019 [member] | Philippinnes [member] | Nonhyperinflationary [member]    
Disclosure Of Cumulative Inflation [line items]    
Type of Economy Non-hyperinflationary  
2016- 2019 [member] | Uruguay | Nonhyperinflationary [member]    
Disclosure Of Cumulative Inflation [line items]    
Cumulative inflation percentage 23.90%  
Type of Economy Non-hyperinflationary