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Goodwill - Additional Information (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of reconciliation of changes in goodwill [line items]
Impairment loss on goodwill	$ 0	$ 0	$ 0
Bottom of range [member]
Disclosure of reconciliation of changes in goodwill [line items]
Discount rate applied to cash flow projections	10.39%	9.59%	9.74%
Top of range [member]
Disclosure of reconciliation of changes in goodwill [line items]
Discount rate applied to cash flow projections	(14.71%)	(14.99%)	10.22%

X

- Definition

The discount rate applied to cash flow projections for a cash-generating unit (group of units). [Refer: Cash-generating units [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2020-01-01
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+ References

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- Definition

The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2020-01-01
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