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Equity - Disaggregation of Changes of Other Comprehensive Income by Each Type of Reserve in Equity (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of analysis of other comprehensive income by item [Line Items]      
Exchange difference on translation of foreign operations $ 10,677 $ (4,388) $ 15,882
Cumulative translation differences reclassified to profit or loss on liquidation of a subsidiary     248
Re-measuring losses on defined benefit plans (1,382) (328) (618)
Net loss on available-for-sale financial assets     (64)
Changes in faire value of financial assets at fair value through other comprehensive income 1,336 (335)  
Other comprehensive income/(loss) for the year, net of tax 10,631 (5,051) 15,448
Reserves including portion related to non-controlling interests [Member] | Re-measurement of defined benefit plans [Member]      
Disclosure of analysis of other comprehensive income by item [Line Items]      
Re-measuring losses on defined benefit plans (1,382) (328) (618)
Other comprehensive income/(loss) for the year, net of tax (1,382) (328) (618)
Reserves including portion related to non-controlling interests [Member] | Financial assets at FVOCI reserve [Member]      
Disclosure of analysis of other comprehensive income by item [Line Items]      
Reclassification of application of IFRS 9   1,717  
Changes in faire value of financial assets at fair value through other comprehensive income 1,336 (335)  
Other comprehensive income/(loss) for the year, net of tax 1,336 1,382  
Reserves including portion related to non-controlling interests [Member] | Foreign currency translation reserve [Member]      
Disclosure of analysis of other comprehensive income by item [Line Items]      
Exchange difference on translation of foreign operations 10,677 (4,388) 15,882
Cumulative translation differences reclassified to profit or loss on liquidation of a subsidiary     248
Other comprehensive income/(loss) for the year, net of tax $ 10,677 (4,388) 16,130
Reserves including portion related to non-controlling interests [Member] | Available-for-sale reserve [Member]      
Disclosure of analysis of other comprehensive income by item [Line Items]      
Reclassification of application of IFRS 9   (1,717)  
Net loss on available-for-sale financial assets     (64)
Other comprehensive income/(loss) for the year, net of tax   $ (1,717) $ (64)