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Employee Benefit - Sensitivity Analysis of One-percentage Point Change in Assumed Rates (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Discount rate [Member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Assumption - 1% increase | $ (777) | $ (721)
Assumption - 1% decrease | 908 | 844
Rate of salary increase [Member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Assumption - 1% increase | 869 | 808
Assumption - 1% decrease | $ (762) | $ (707)

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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_145_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_145_a&doctype=Standard -URIDate 2018-03-16 + Details
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