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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, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($)
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Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at fair value through profit or loss, current | $ 443,601 | $ 14,487 | $ 705,918
Financial assets at fair value through profit or loss, noncurrent | 16,694,860 | 545,227 | 17,784,651
Financial assets at fair value through other comprehensive income, current | 5,753,379 | 187,896 | 3,213,057
Financial assets at fair value through other comprehensive income, noncurrent | 11,930,581 | 389,634 | 11,976,543
Financial liabilities at fair value through profit or loss, current | 1,019,362 | $ 33,291 | 438,397
Level 1 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at fair value through profit or loss, current | 443,601 |  | 669,444
Financial assets at fair value through profit or loss, noncurrent | 6,424,475 |  | 6,626,088
Financial assets at fair value through other comprehensive income, current | 5,753,379 |  | 3,213,057
Financial assets at fair value through other comprehensive income, noncurrent | 8,693,193 |  | 8,366,276
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 | 0 |  | 0
Financial assets at fair value through profit or loss, noncurrent | 19,300 |  | 468,164
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 | 0 |  | 0
Level 3 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at fair value through profit or loss, current | 0 |  | 36,474
Financial assets at fair value through profit or loss, noncurrent | 10,251,085 |  | 10,690,399
Financial assets at fair value through other comprehensive income, current | 0 |  | 0
Financial assets at fair value through other comprehensive income, noncurrent | 3,237,388 |  | 3,610,267
Financial liabilities at fair value through profit or loss, current | $ 1,019,362 |  | $ 438,397

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