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New Standards And Interpretations - Schedule of Significant Effects of Adopting New Standards (Parenthetical) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items]        
Contract assets $ 4,686 $ 1,460 $ 162  
Available-for-sale financial assets expected to reclassify     2,747  
Fair value gains on financial assets reclassified from available-for-sale financial assets reserve to fair value other comprehensive income reserve     1,717  
Trade receivables 74,077 79,617 112,419 $ 112,403
Retained earnings 53,384 55,016 53,257 53,350
Deferred tax assets 3,939 3,919 3,026 $ 3,022
Contract liabilities - current $ 216 $ 756 113  
IFRS 9 [Member]        
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items]        
Trade Receivables Impairment     16  
Trade receivables     16  
Retained earnings     16  
Effect of IFRS 9 And IFRS 15 [Member]        
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items]        
Retained earnings     4  
Deferred tax assets     4  
Non-controlling interests [Member]        
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items]        
Fair value gains on financial assets reclassified from available-for-sale financial assets reserve to fair value other comprehensive income reserve     843  
Increase (decrease) due to application of IFRS 15 [member]        
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items]        
Contract assets     162  
Gross amounts due from customers for contract work-in-progress     (162)  
Retained earnings     (113)  
Contract liabilities - current     $ 113