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Inventories - Summary of Inventories (Detail) - TWD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure of inventories [Line Items] |  |
Raw materials | $ 3,207,177 | $ 2,102,075
Gross carrying amount [member] |  |
Disclosure of inventories [Line Items] |  |
Raw materials | 3,328,763 | 2,181,890
Allowance for impairment losses [member] |  |
Disclosure of inventories [Line Items] |  |
Raw materials | $ (121,586) | $ (79,815)

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