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Equity - Summary of Unearned Employee Compensation (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Disclosure of Restricted Stock Awards for Employees [Abstract] |  |  |  |
Balance at January 1 | $ 0 | $ 0 | $ (432,847) | $ (1,164,991)
Issuance of shares | (1,954,312) | (59,600) | 0 | 0
Share-based payment expenses | 395,487 | 12,061 | 11,840 | 728,748
Valuation adjustments | (72,432) | (2,209) | 421,007 | 3,396
Balance at December 31 | $ (1,631,257) | $ (49,748) | $ 0 | $ (432,847)

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