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Loans and borrowings - Summary of Finance Cost and Income (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]      
Finance income $ 19,963 $ 24,405 $ 23,628
Finance cost (73,045) (57,432) (50,825)
Interest income on short-term bank deposits [member]      
Disclosure of detailed information about borrowings [line items]      
Finance income 543 1,432 1,670
Interest income on investment [member]      
Disclosure of detailed information about borrowings [line items]      
Finance income 19,420 22,973 21,958
Interests expense on bank loans [member]      
Disclosure of detailed information about borrowings [line items]      
Finance cost (29,711) (36,676) (34,687)
Interest Expense on Senior Convertible Notes [Member]      
Disclosure of detailed information about borrowings [line items]      
Finance cost (23,571) 0 0
Interest on factoring [member]      
Disclosure of detailed information about borrowings [line items]      
Finance cost (256) (1,316) (1,163)
Interest on lease liabilities [member]      
Disclosure of detailed information about borrowings [line items]      
Finance cost (10,734) (14,140) (14,975)
Other finance cost [member]      
Disclosure of detailed information about borrowings [line items]      
Finance cost $ (8,773) $ (5,300) $ 0