Effects on Initial Application of IFRS 9 and Information for the Year Ended December 31, 2017 in Conformity With IAS 39 - Summary of Significant Accounts (Detail) $ in Thousands	Dec. 31, 2017 TWD ($)
Disclosure of financial assets [Line Items]
Available-for-sale financial assets	$ 20,890
Gross carrying amount [member]
Disclosure of financial assets [Line Items]
Available-for-sale financial assets	49,474
Allowance for impairment losses [member]
Disclosure of financial assets [Line Items]
Available-for-sale financial assets	$ (28,584)

The amount of non-current financial assets available-for-sale. [Refer: Financial assets available-for-sale; Non-current financial assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 8
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_8_d&doctype=Standard&book=b
-URIDate 2019-03-27

Name:	ifrs-full_NoncurrentFinancialAssetsAvailableforsale
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant