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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
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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)

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- Definition The amount of income and expense (including reclassification adjustments) that is not recognised in profit or loss as required or permitted by IFRSs. [Refer: IFRSs [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d_ii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph B12 -Subparagraph b -Clause viii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B12_b_viii&doctype=Appendix&seq=2 -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 81A -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_81A_b&doctype=Standard -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_91_a&doctype=Standard -URIDate 2017-03-09 + Details
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