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Other Income (Expenses), Net - Summary of Other Income (Expenses), Net (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($)
Analysis of income and expense [abstract] |  |  |  |
Gain on disposal of property, plant and equipment, net | $ 18,431 |  | $ 74,548 | $ 33,935
Gain on disposal of scrapped materials | 44,662 |  | 35,381 | 52,254
Gain on disposal of items purchased on behalf of others | 12,729 |  | 19,107 | 21,945
Gains from lease modifications |  |  | 139 | 891
Impairment loss on property, plant and equipment | (9,236) | $ (302) | (12,721) | (4,843)
Others | 19,357 |  | 13,479 | 21,405
Other operating income (expense), Total | $ 85,943 | $ 2,807 | $ 129,933 | $ 125,587

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