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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, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Disclosure of products and services [line items]        
Operating revenue $ 670,872,643 $ 21,831,196 $ 569,997,133 $ 476,978,710
Packaging service [member]        
Disclosure of products and services [line items]        
Operating revenue 303,947,502 9,890,905 272,543,899 218,666,071
Testing service [member]        
Disclosure of products and services [line items]        
Operating revenue 55,960,182 1,821,028 49,978,736 47,271,074
EMS        
Disclosure of products and services [line items]        
Operating revenue 301,966,818 9,826,450 239,488,267 204,690,669
Other products and services [member]        
Disclosure of products and services [line items]        
Operating revenue $ 8,998,141 $ 292,813 $ 7,986,231 $ 6,350,896