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Financial Risk and Fair Value Disclosures - Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($)
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Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at fair value through profit or loss, current | $ 606,018 | $ 18,482 | $ 443,601
Financial assets at fair value through profit or loss, noncurrent | 17,850,914 | 544,401 | 16,694,860
Financial assets at fair value through other comprehensive income, current | 5,893,377 | 179,731 | 5,753,379
Financial assets at fair value through other comprehensive income, noncurrent | 11,315,951 | 345,104 | 11,930,581
Financial liabilities at fair value through profit or loss, current | 901,000 | $ 27,478 | 1,019,362
Level 1 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at fair value through profit or loss, current | 606,016 |  | 443,601
Financial assets at fair value through profit or loss, noncurrent | 5,703,325 |  | 6,424,475
Financial assets at fair value through other comprehensive income, current | 5,893,377 |  | 5,753,379
Financial assets at fair value through other comprehensive income, noncurrent | 7,879,553 |  | 8,693,193
Financial liabilities at fair value through profit or loss, current | 0 |  | 0
Level 2 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at fair value through profit or loss, current | 2 |  | 0
Financial assets at fair value through profit or loss, noncurrent | 18,800 |  | 19,300
Financial assets at fair value through other comprehensive income, current | 0 |  | 0
Financial assets at fair value through other comprehensive income, noncurrent | 0 |  | 0
Financial liabilities at fair value through profit or loss, current | 1,039 |  | 0
Level 3 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at fair value through profit or loss, current | 0 |  | 0
Financial assets at fair value through profit or loss, noncurrent | 12,128,789 |  | 10,251,085
Financial assets at fair value through other comprehensive income, current | 0 |  | 0
Financial assets at fair value through other comprehensive income, noncurrent | 3,436,398 |  | 3,237,388
Financial liabilities at fair value through profit or loss, current | $ 899,961 |  | $ 1,019,362

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