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Retirement Benefit Plans - Summary of Sensitivity Analysis on Defined Obligations (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($)
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Actuarial assumption of discount rates [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Change in defined obligation due to increase in actuarial assumption | $ (455,158) | $ (15,356) | $ (464,647)
Change in defined obligation due to decrease in actuarial assumption | 461,891 | 15,583 | 508,862
Actuarial assumption of expected rates of salary increases [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Change in defined obligation due to increase in actuarial assumption | 453,792 | 15,310 | 500,051
Change in defined obligation due to decrease in actuarial assumption | $ (444,493) | $ (14,996) | $ (452,956)

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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 2017-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145_a&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145_a&doctype=Standard -URIDate 2017-03-09 + Details
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