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Inventories - Summary of Inventories (Detail) - TWD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of inventories [Line Items] |  |
Raw materials | $ 2,694,594 | $ 2,568,648
Gross carrying amount [member] |  |
Disclosure of inventories [Line Items] |  |
Raw materials | 2,854,743 | 2,754,911
Allowance for impairment losses [member] |  |
Disclosure of inventories [Line Items] |  |
Raw materials | $ (160,149) | $ (186,263)

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