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Significant Accounting Policies - Summary of Average Exchange Rate (Detail)
 12 Months Ended
Dec. 31, 2017
$ / $
ExchangeRate
Dec. 31, 2016
ExchangeRate
Dec. 31, 2015
ExchangeRate
Disclosure of foreign exchange rates [line items]      
Exchange Rate | $ / $ 19.64    
Mexico, Pesos [member]      
Disclosure of foreign exchange rates [line items]      
Average Exchange Rate 1.00 1.00 1.00
Exchange Rate 1.00 1.00  
Guatemala, Quetzales      
Disclosure of foreign exchange rates [line items]      
Average Exchange Rate 2.57 2.46 2.07
Exchange Rate 2.69 2.75  
Costa Rica, Colones      
Disclosure of foreign exchange rates [line items]      
Average Exchange Rate 0.03 0.03 0.03
Exchange Rate 0.03 0.04  
Colombia, Pesos [member]      
Disclosure of foreign exchange rates [line items]      
Average Exchange Rate 0.01 0.01 0.01
Exchange Rate 0.01 0.01  
Nicaragua, Cordobas      
Disclosure of foreign exchange rates [line items]      
Average Exchange Rate 0.63 0.65 0.58
Exchange Rate 0.64 0.70  
Argentina, Pesos [member]      
Disclosure of foreign exchange rates [line items]      
Average Exchange Rate 1.15 1.26 1.71
Exchange Rate 1.06 1.30  
Brazil, Brazil Real [member]      
Disclosure of foreign exchange rates [line items]      
Average Exchange Rate 5.94 5.39 4.81
Exchange Rate 5.97 6.34  
Philippines, Pesos      
Disclosure of foreign exchange rates [line items]      
Average Exchange Rate 0.38 0.39 0.35
Exchange Rate 0.40 0.41  
Panama [member] | United States of America, Dollars [member]      
Disclosure of foreign exchange rates [line items]      
Average Exchange Rate 18.93 18.66 15.85
Exchange Rate 19.74 20.66