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Investments in Associates - Summarized Financial Information of Investments in Associates (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of associates [line items]        
Current assets $ 263,699 $ 239,504    
Non-current assets 74,420 59,407    
Current liabilities (83,376) (53,649)    
Non-current liabilities (19,868) (16,827)    
Total equity 234,875 228,435 $ 221,816 $ 222,733
Carrying amount of the investment 930 935 864  
Revenue 313,564 338,160 425,940  
Profit /(loss) for the year 3,709 (951) 7,446  
Share of loss of associates (1) (3) $ (3)  
Siam Pacific Holding Company Limited [Member]        
Disclosure of associates [line items]        
Current assets 6 3    
Non-current assets 2,095 2,103    
Current liabilities (2) (3)    
Non-current liabilities (202) (196)    
Total equity $ 1,897 $ 1,907    
Percentage of equity interest 49.00% 49.00% 49.00%  
Carrying amount of the investment $ 930 $ 935    
Profit /(loss) for the year (2) (6) $ (5)  
Share of loss of associates $ (1) $ (3) $ (3)