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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, 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)

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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 2019-01-01 -Paragraph 106 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_106_d_ii&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph B12 -Subparagraph b -Clause viii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B12_b_viii&doctype=Appendix&subtype=B -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 81A -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_81A_b&doctype=Standard -URIDate 2019-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_91_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of other comprehensive income, net of tax, related to exchange differences when financial statements of foreign operations are translated. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_91_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard -URIDate 2019-03-27 + Details
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