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Inventories - Summary of Inventories (Detail) - TWD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Disclosure of inventories [Line Items] |  |
Raw materials | $ 3,210,409 | $ 3,207,177
Gross carrying amount [member] |  |
Disclosure of inventories [Line Items] |  |
Raw materials | 3,316,039 | 3,328,763
Allowance for impairment losses [member] |  |
Disclosure of inventories [Line Items] |  |
Raw materials | $ (105,630) | $ (121,586)

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