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Goodwill - Summary of Carrying Amounts of Goodwill Allocated to Cash-generating Units (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure of information for cash-generating units [line items]            
Goodwill $ 52,313,399 $ 1,702,356 $ 52,072,413 $ 1,694,514 $ 52,709,053 $ 50,198,436
Packaging segment [member]            
Disclosure of information for cash-generating units [line items]            
Goodwill 35,427,102 1,152,851 35,412,424      
Testing segment [member]            
Disclosure of information for cash-generating units [line items]            
Goodwill 13,414,275 436,521 13,304,040      
EMS Segment [Member]            
Disclosure of information for cash-generating units [line items]            
Goodwill 3,323,920 108,165 3,207,848      
All other segments [member]            
Disclosure of information for cash-generating units [line items]            
Goodwill $ 148,101 $ 4,819 $ 148,101