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Investments accounted for using equity method - Additional Information (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2022 TWD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 TWD ($)
Disclosure of associates [line items]
Carrying amount of investment in associates	$ 4,353,448	$ 141,668	$ 3,900,449
Individually Immaterial Associates [member]
Disclosure of associates [line items]
Carrying amount of investment in associates	4,353,448		3,900,449
JMC ELECTRONICS CO., LTD. [member]
Disclosure of associates [line items]
Investment in associates at fair value	249,000		468,950
Carrying amount of investment in associates	$ 267,070		$ 304,437

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

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- Definition

The amount of investments in associates accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 55
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-URIDate 2022-03-24

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The amount of investment in associates which is measured in fair value.

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