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Business Combinations - Summary of Goodwill Recognized on Acquisitions (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 detailed information about business combination [Line Items]            
Goodwill $ 52,313,399 $ 1,702,356 $ 52,072,413 $ 1,694,514 $ 52,709,053 $ 50,198,436
FAFG [member]            
Disclosure of detailed information about business combination [Line Items]            
Total consideration 12,443,637          
Add: Non-controlling interests 289          
Less: Fair value of identifiable net assets acquired (9,876,084)          
Goodwill 2,567,842          
ITGEU            
Disclosure of detailed information about business combination [Line Items]            
Total consideration 50,368          
Less: Fair value of identifiable net assets acquired (83,482)          
Goodwill (33,114)          
SER [Member]            
Disclosure of detailed information about business combination [Line Items]            
Total consideration 217,919          
Less: Fair value of identifiable net assets acquired $ (217,919)