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Financial Instruments - Additional Information (Detail) - TWD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term bank loans |  | $ 21.8 |
Percentage of accounts receivable from ten largest customers | 70.00% | 74.00% |
Currency Risk [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Assumed change in risk | (10.00%) |  |
Assumed change in risk, monetary effect | $ (867.9) | $ (111.3) | $ (902.1)
Currency Risk [member] | Other Comprehensive Income (Loss) [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Assumed change in risk, monetary effect | $ (265.9) |  |
Interest rate risk [member] | Floating Interest Rate [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Assumed change in risk | 1.00% |  |
Assumed change in risk, monetary effect |  | 0.3 | 0.3
Interest rate risk [member] | Available-for-sale Fixed Income Securities [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Assumed change in risk | 1.00% |  |
Assumed change in risk, monetary effect | $ (2,119.7) | (1,600.9) |
Equity Price Risk [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Assumed change in risk | (5.00%) |  |
Assumed change in risk, monetary effect | $ (351.5) | $ (342.6) | $ (260.0)

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- Definition The non-current portion of non-current loans received. [Refer: Loans received] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Percentage of accounts receivable from the top ten customers. + References No definition available. + Details
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