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Financial Risk Management and Fair Values of Financial Instruments - Details of Exposure to Currency Risk Arising from Recognized Monetary Assets or Liabilities Denominated in a Currency Other Than Functional Currency (Detail) - Currency Risk [member] - TWD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Financial assets, class [member] | US$ [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |  |
Change in exchange rate | 5.00% | 5.00% | 5.00%
Financial assets, class [member] | JPY [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |  |
Change in exchange rate | 5.00% | 5.00% | 5.00%
Financial assets, class [member] | RMB [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |  |
Change in exchange rate | 5.00% | 5.00% | 5.00%
Financial liabilities, class [member] | US$ [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |  |
Change in exchange rate | 5.00% | 5.00% | 5.00%
Financial liabilities, class [member] | JPY [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |  |
Change in exchange rate | 5.00% | 5.00% | 5.00%
Profit and Loss [member] | Financial assets, class [member] | US$ [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |  |
Effect of change in exchange rate | $ 258,959 | $ 230,037 | $ 320,903
Profit and Loss [member] | Financial assets, class [member] | JPY [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |  |
Effect of change in exchange rate | 2,757 | 2,052 | 1,336
Profit and Loss [member] | Financial assets, class [member] | RMB [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |  |
Effect of change in exchange rate | 2,984 | 1,211 | 1,587
Profit and Loss [member] | Financial liabilities, class [member] | US$ [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |  |
Effect of change in exchange rate | 38,809 | 32,509 | 16,938
Profit and Loss [member] | Financial liabilities, class [member] | JPY [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |  |
Effect of change in exchange rate | $ 13,349 | $ 11,971 | $ 18,449

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- Definition The amount of risk exposure associated with financial instruments with a shared characteristic that identifies a concentration of risks. [Refer: Classes of financial instruments [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph B8 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_B8_c&doctype=Appendix&subtype=B -URIDate 2024-03-27 + Details
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