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Significant Accounting Policies - Disclosure of Recognition of Effects of Inflation in Countries with Hyperinflationary Economic Environments (Detail)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
2015 - 2017 [member] | Mexico [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation 12.70%    
Type of Economy Non-hyperinflationary    
2015 - 2017 [member] | Guatemala [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation 13.50%    
Type of Economy Non-hyperinflationary    
2015 - 2017 [member] | Costa Rica [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation 2.50%    
Type of Economy Non-hyperinflationary    
2015 - 2017 [member] | Panama [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation 2.30%    
Type of Economy Non-hyperinflationary    
2015 - 2017 [member] | Colombia [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation 17.50%    
Type of Economy Non-hyperinflationary    
2015 - 2017 [member] | Nicaragua [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation 12.30%    
Type of Economy Non-hyperinflationary    
2015 - 2017 [member] | Argentina [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation 101.50%    
Type of Economy Non-hyperinflationary    
2015 - 2017 [member] | Venezuela [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation 30690.00%    
Type of Economy Hyperinflationary    
2015 - 2017 [member] | Brazil [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation 21.10%    
Type of Economy Non-hyperinflationary    
2015 - 2017 [member] | Philippines [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation 7.50%    
Type of Economy Non-hyperinflationary    
2015 - 2017 [member] | Euro Zone [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation 2.72%    
Type of Economy Non-hyperinflationary    
2015 - 2017 [member] | Chile [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation 9.67%    
Type of Economy Non-hyperinflationary    
2015 - 2017 [member] | Peru [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation 9.28%    
Type of Economy Non-hyperinflationary    
2015 - 2017 [member] | Ecuador [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation 30.34%    
Type of Economy Non-hyperinflationary    
2014-2016 [member] | Mexico [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation   9.90%  
Type of Economy   Non-hyperinflationary  
2014-2016 [member] | Guatemala [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation   10.60%  
Type of Economy   Non-hyperinflationary  
2014-2016 [member] | Costa Rica [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation   5.10%  
Type of Economy   Non-hyperinflationary  
2014-2016 [member] | Panama [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation   2.80%  
Type of Economy   Non-hyperinflationary  
2014-2016 [member] | Colombia [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation   17.00%  
Type of Economy   Non-hyperinflationary  
2014-2016 [member] | Nicaragua [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation   13.10%  
Type of Economy   Non-hyperinflationary  
2014-2016 [member] | Argentina [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation   99.70%  
Type of Economy   Non-hyperinflationary  
2014-2016 [member] | Venezuela [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation   2263.00%  
Type of Economy   Hyperinflationary  
2014-2016 [member] | Brazil [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation   25.20%  
Type of Economy   Non-hyperinflationary  
2014-2016 [member] | Philippines [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation   5.70%  
Type of Economy   Non-hyperinflationary  
2014-2016 [member] | Euro Zone [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation   1.20%  
Type of Economy   Non-hyperinflationary  
2014-2016 [member] | Chile [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation   12.20%  
Type of Economy   Non-hyperinflationary  
2014-2016 [member] | Peru [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation   11.20%  
Type of Economy   Non-hyperinflationary  
2014-2016 [member] | Ecuador [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation   8.40%  
Type of Economy   Non-hyperinflationary  
2013-2015 [member] | Mexico [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation     10.50%
Type of Economy     Non-hyperinflationary
2013-2015 [member] | Guatemala [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation     10.80%
Type of Economy     Non-hyperinflationary
2013-2015 [member] | Costa Rica [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation     8.10%
Type of Economy     Non-hyperinflationary
2013-2015 [member] | Panama [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation     5.10%
Type of Economy     Non-hyperinflationary
2013-2015 [member] | Colombia [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation     12.80%
Type of Economy     Non-hyperinflationary
2013-2015 [member] | Nicaragua [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation     15.80%
Type of Economy     Non-hyperinflationary
2013-2015 [member] | Argentina [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation     59.20%
Type of Economy     Non-hyperinflationary
2013-2015 [member] | Venezuela [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation     562.90%
Type of Economy     Hyperinflationary
2013-2015 [member] | Brazil [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation     24.70%
Type of Economy     Non-hyperinflationary
2013-2015 [member] | Philippines [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation     8.30%
Type of Economy     Non-hyperinflationary
2013-2015 [member] | Euro Zone [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation     0.90%
Type of Economy     Non-hyperinflationary
2013-2015 [member] | Chile [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation     12.50%
Type of Economy     Non-hyperinflationary
2013-2015 [member] | Peru [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation     10.80%
Type of Economy     Non-hyperinflationary
2013-2015 [member] | Ecuador [member]      
Disclosure of Hyperinflationary Reporting [Line Items]      
Cumulative Inflation     10.00%
Type of Economy     Non-hyperinflationary