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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of analysis of other comprehensive income by item [Line Items]      
Exchange difference on translation of foreign operations $ 15,882 $ (886) $ (15,847)
Cumulative translation differences reclassified to profit or loss on liquidation of a subsidiary 248    
Re-measuring gain (losses) on defined benefit plans (618) 2 (206)
Net loss/gain on available-for-sale financial assets (64) (82) 543
Other comprehensive income/( loss) for the year, net of tax 15,448 (966) (15,510)
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]      
Net loss/gain on available-for-sale financial assets (64) (82) 543
Other comprehensive income/( loss) for the year, net of tax (64) (82) 543
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 15,882 (886) (15,847)
Cumulative translation differences reclassified to profit or loss on liquidation of a subsidiary 248    
Other comprehensive income/( loss) for the year, net of tax 16,130 (886) (15,847)
Reserves including portion related to non-controlling interests [Member] | Actuarial losses on defined benefit plans [Member]      
Disclosure of analysis of other comprehensive income by item [Line Items]      
Re-measuring gain (losses) on defined benefit plans (618) 2 (206)
Other comprehensive income/( loss) for the year, net of tax $ (618) $ 2 $ (206)