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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, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure of products and services [line items]        
Operating revenue $ 569,997,133 $ 20,547,842 $ 476,978,710 $ 413,182,184
Packaging service [member]        
Disclosure of products and services [line items]        
Operating revenue 272,543,899 9,824,942 218,666,071 198,916,897
Testing service [member]        
Disclosure of products and services [line items]        
Operating revenue 49,978,736 1,801,685 47,271,074 42,658,686
EMS        
Disclosure of products and services [line items]        
Operating revenue 239,488,267 8,633,319 204,690,669 165,789,479
Other products and services [member]        
Disclosure of products and services [line items]        
Operating revenue $ 7,986,231 $ 287,896 $ 6,350,896 $ 5,817,122