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Significant Accounting Policies - Summary of Foreign Exchange Rates (Detail)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
US Dollar [member]      
Disclosure of foreign exchange rates [line items]      
Closing 19.6500 19.6500 20.7200
Average 19.2583 18.8800 18.7200
Euro [member]      
Disclosure of foreign exchange rates [line items]      
Closing 22.5169 23.5866 21.7945
Average 22.7036 21.4122 20.6564
Pounds [member]      
Disclosure of foreign exchange rates [line items]      
Closing 25.0557 26.5361 25.5361
Average 25.6059 24.4977 25.0731
Colombian Peso [member]      
Disclosure of foreign exchange rates [line items]      
Closing 0.0060 0.0066 0.0069
Average 0.0065 0.0064 0.0062
Egyptian, Pound [member]      
Disclosure of foreign exchange rates [line items]      
Closing 1.0943 1.1082 1.1234
Average 1.0806 1.0620 1.8261
Philippine pesos [member]      
Disclosure of foreign exchange rates [line items]      
Closing 0.3737 0.3936 0.4167
Average 0.3655 0.3747 0.3927