Equity - Disaggregation of Changes of Other Comprehensive Income by Each Type of Reserve in Equity (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of analysis of other comprehensive income by item [Line Items]
Exchange difference on translation of foreign operations	$ 5,211	$ 10,677	$ (4,388)
Re-measuring losses on defined benefit plans	159	(1,382)	(328)
Changes in fair value of financial assets at fair value through other comprehensive income	(1,431)	1,336	(335)
Other comprehensive income/(loss) for the year, net of tax	3,939	10,631	(5,051)
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	159	(1,382)	(328)
Other comprehensive income/(loss) for the year, net of tax	159	(1,382)	(328)
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 fair value of financial assets at fair value through other comprehensive income	(1,431)	1,336	(335)
Other comprehensive income/(loss) for the year, net of tax	(1,431)	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	5,211	10,677	(4,388)
Other comprehensive income/(loss) for the year, net of tax	$ 5,211	$ 10,677	(4,388)
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)
Other comprehensive income/(loss) for the year, net of tax			$ (1,717)

Reclassification adjustments on adoption of IFRS 9.

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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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
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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
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- Definition

The amount of other comprehensive income, net of tax, related to gains (losses) from changes in the fair value of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: Other comprehensive income]

+ References

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- Definition

The amount of other comprehensive income, net of tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [member]; Plan assets [member]; Net defined benefit liability (asset)]

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