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Debt - Summary of Finance Cost and Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about borrowings [line items]      
Finance income $ 17,939 $ 13,000 $ 25,947
Finance cost (35,223) (37,024) (33,155)
Interest income on short-term bank deposits [member]      
Disclosure of detailed information about borrowings [line items]      
Finance income 1,499 675 3,662
Interest income on investment [member]      
Disclosure of detailed information about borrowings [line items]      
Finance income 16,440 12,325 22,285
Interests expense on bank loans [member]      
Disclosure of detailed information about borrowings [line items]      
Finance cost (32,599) (32,647) (30,866)
Interest on factoring [member]      
Disclosure of detailed information about borrowings [line items]      
Finance cost $ (2,624) $ (4,377) $ (2,289)