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Financial Risk Management Objectives - Sensitivity of Profit Before Tax and Equity to a Reasonably Possible Change of Each Foreign Currency Exchange Rates (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
5% increase in rate [Member]    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]    
Percentage of change of foreign currency exchange rates 5.00% 5.00%
5% increase in rate [Member] | Singapore dollars (SGD) [Member]    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]    
Change in profit before tax due to change of foreign currency exchange rates $ (1) $ 4
5% increase in rate [Member] | Taiwan dollar (TWD) [Member]    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]    
Change in profit before tax due to change of foreign currency exchange rates 7 (1)
5% increase in rate [Member] | Renminbi (RMB) [Member]    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]    
Change in profit before tax due to change of foreign currency exchange rates 718 541
5% increase in rate [Member] | Hong Kong, dollar (HKD) [Member]    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]    
Change in profit before tax due to change of foreign currency exchange rates 202 128
5% increase in rate [Member] | Australian dollar (AUD) [Member]    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]    
Change in profit before tax due to change of foreign currency exchange rates $ 30 34
5% increase in rate [Member] | Japanese yen (JPY) [Member]    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]    
Change in profit before tax due to change of foreign currency exchange rates   $ (6)
5% decrease in rate [Member]    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]    
Percentage of change of foreign currency exchange rates (5.00%) (5.00%)
5% decrease in rate [Member] | Singapore dollars (SGD) [Member]    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]    
Change in profit before tax due to change of foreign currency exchange rates $ 1 $ (4)
5% decrease in rate [Member] | Taiwan dollar (TWD) [Member]    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]    
Change in profit before tax due to change of foreign currency exchange rates (7) 1
5% decrease in rate [Member] | Renminbi (RMB) [Member]    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]    
Change in profit before tax due to change of foreign currency exchange rates (718) (541)
5% decrease in rate [Member] | Hong Kong, dollar (HKD) [Member]    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]    
Change in profit before tax due to change of foreign currency exchange rates (202) (127)
5% decrease in rate [Member] | Australian dollar (AUD) [Member]    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]    
Change in profit before tax due to change of foreign currency exchange rates $ (30) (34)
5% decrease in rate [Member] | Japanese yen (JPY) [Member]    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]    
Change in profit before tax due to change of foreign currency exchange rates   $ 6