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Available-for-sale Financial Assets - Summary of Available-for-sale Financial Assets (Detail) $ in Thousands	Dec. 31, 2017 TWD ($)
Disclosure of financial assets [Line Items]
Available-for-sale financial assets	$ 1,212,165
Current	89,159
Non-current	1,123,006
Unquoted ordinary shares [member]
Disclosure of financial assets [Line Items]
Available-for-sale financial assets	605,110
Quoted ordinary shares [member]
Disclosure of financial assets [Line Items]
Available-for-sale financial assets	279,791
Limited partnership [member]
Disclosure of financial assets [Line Items]
Available-for-sale financial assets	246,072
Unquoted preferred shares [member]
Disclosure of financial assets [Line Items]
Available-for-sale financial assets	57,367
Open-end mutual funds [member]
Disclosure of financial assets [Line Items]
Available-for-sale financial assets	$ 23,825

X

- 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 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 8
-Subparagraph d
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-URIDate 2018-03-16

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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 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 8
-Subparagraph d
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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

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-Note Expiry date 2021-01-01
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-IssueDate 2018-01-01
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