Financial Risk and Fair Value Disclosures - Reconciliation for Fair Value Measurement in Level 3 Derivatives Financial Liabilities (Detail) $ in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2025 TWD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 TWD ($)
Disclosure of fair value measurement of liabilities [line items]
Beginning balance	$ 194,462,244
Ending balance	201,362,691	$ 6,418,957	$ 194,462,244
Derivatives [member] \| Financial liabilities at fair value through profit or loss, category [member] \| Level 3 [member]
Disclosure of fair value measurement of liabilities [line items]
Beginning balance	899,961		1,019,362
Recognized in loss (profit)	(845,310)		(119,401)
Ending balance	$ 54,651		$ 899,961

The amount of a present obligation of the entity to transfer an economic resource as a result of past events. Economic resource is a right that has the potential to produce economic benefits.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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+ Details