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Significant Accounting Policies - Summary of Foreign Exchange Rates (Detail) | 12 Months Ended
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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

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