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Retirement Benefit Plans - Summary of Maturity Analysis of Undiscounted Pension Benefit (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($)
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Disclosure of defined benefit plans [line items] |  |  |
Maturity analysis of undiscounted pension benefit | $ 18,350,395 | $ 619,109 | $ 19,095,234
Less than 1 year [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Maturity analysis of undiscounted pension benefit | 291,152 | 9,823 | 292,100
1-5 years [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Maturity analysis of undiscounted pension benefit | 1,551,496 | 52,345 | 1,673,549
More than 5 years [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Maturity analysis of undiscounted pension benefit | $ 16,507,747 | $ 556,941 | $ 17,129,585

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- Definition The present value of the expected payments by a retirement benefit plan to existing and past employees, attributable to the service already rendered. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2017-01-01 -Paragraph 35 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=26&date=2017-03-01&anchor=para_35_d&doctype=Standard -URIDate 2017-03-09 + Details
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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. + Details
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