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Segment Information - Schedule of Geographical Information (Detail) - TWD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Non-current assets [abstract]
Total non-current assets	$ 18,925,463	$ 18,733,638
ROC [member]
Non-current assets [abstract]
Total non-current assets	18,913,501	18,727,979
PRC [member]
Non-current assets [abstract]
Total non-current assets	117
Others [Member]
Non-current assets [abstract]
Total non-current assets	$ 11,845	$ 5,659

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- Definition

The amount of non-current assets other than financial instruments, deferred tax assets, post-employment benefit assets and rights arising under insurance contracts. [Refer: Deferred tax assets; Financial instruments, class [member]; Non-current assets; Types of insurance contracts [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2020-01-01
-Paragraph 33
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_33_b&doctype=Standard
-URIDate 2020-01-01

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