Operating Segments Information - Additional Information (Detail) $ in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2024 TWD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 TWD ($)	Dec. 31, 2022 TWD ($)
Disclosure of operating segments [line items]
Operating revenue	$ 595,409,585	$ 18,158,267	$ 581,914,471	$ 670,872,643
Customer One [member]
Disclosure of operating segments [line items]
Operating revenue	$ 0		$ 0	$ 0
Percentage of entity's revenue	10.00%	10.00%	10.00%	10.00%
Packaging and EMS segments [member] \| Customer One [member]
Disclosure of operating segments [line items]
Operating revenue	$ 174,486,187	$ 5,321,323	$ 170,970,446	$ 198,858,465

The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

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+ Details