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Operating Segments Information - Summary of Revenue from Major Products and Services (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 products and services [line items]        
Operating revenue $ 595,409,585 $ 18,158,267 $ 581,914,471 $ 670,872,643
Packaging service [member]        
Disclosure of products and services [line items]        
Operating revenue 261,731,413 7,982,050 256,805,887 303,947,502
Testing service [member]        
Disclosure of products and services [line items]        
Operating revenue 54,561,480 1,663,967 49,879,923 55,960,182
EMS [member]        
Disclosure of products and services [line items]        
Operating revenue 271,293,309 8,273,660 268,218,002 301,966,818
Other products and services [member]        
Disclosure of products and services [line items]        
Operating revenue $ 7,823,383 $ 238,590 $ 7,010,659 $ 8,998,141