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Available-for-sale Financial Assets - Summary of Available-for-sale Financial Assets (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($)
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Disclosure of financial assets [Line Items] |  |  |
Available-for-sale financial assets | $ 1,212,165 | $ 40,896 | $ 1,295,034
Current | 89,159 | 3,008 | 266,696
Non-current | 1,123,006 | 37,888 | 1,028,338
Unquoted ordinary shares [member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Available-for-sale financial assets | 605,110 | 20,415 | 553,350
Quoted ordinary shares [member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Available-for-sale financial assets | 279,791 | 9,440 | 146,786
Limited partnership [member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Available-for-sale financial assets | 246,072 | 8,302 | 273,372
Unquoted preferred shares [member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Available-for-sale financial assets | 57,367 | 1,935 | 78,068
Open-end mutual funds [member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Available-for-sale financial assets | $ 23,825 | $ 804 | $ 243,458

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- Definition The amount of current financial assets available-for-sale. [Refer: Financial assets available-for-sale; Current financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_d&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The amount of non-derivative financial assets that are designated as available for sale or are not classified as (a) loans and receivables; (b) held-to-maturity investments; or (c) financial assets at fair value through profit or loss. [Refer: Derivative financial assets; Financial assets at fair value through profit or loss; Held-to-maturity investments] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_d&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The amount of non-current financial assets available-for-sale. [Refer: Financial assets available-for-sale; Non-current financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_d&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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