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Investments in Associates - Summarized Financial Information of Investments in Associates (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of associates [line items]        
Current assets $ 239,504 $ 254,148    
Non-current assets 59,407 51,650    
Current liabilities (53,649) (71,738)    
Non-current liabilities (16,827) (12,244)    
Total equity 228,435 221,816 $ 222,826 $ 197,175
Carrying amount of the investment 935 864 861  
Revenue 338,160 425,940 425,215  
Profit /(loss) for the year (951) 7,446 13,528  
Share of loss of associates (3) (3) $ (3)  
Siam Pacific Holding Company Limited [Member]        
Disclosure of associates [line items]        
Current assets 3 9    
Non-current assets 2,103 1,938    
Current liabilities (3) (3)    
Non-current liabilities (196) (181)    
Total equity $ 1,907 $ 1,763    
Percentage of equity interest 49.00% 49.00% 49.00%  
Carrying amount of the investment $ 935 $ 864    
Profit /(loss) for the year (6) (5) $ (5)  
Share of loss of associates $ (3) $ (3) $ (3)