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Business Combinations - Summary of Goodwill Recognized on Acquisitions (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure of detailed information about business combination [Line Items]            
Goodwill $ 52,072,413 $ 1,877,160 $ 52,709,053 $ 1,900,110 $ 50,198,436 $ 49,974,446
AMPI [member]            
Disclosure of detailed information about business combination [Line Items]            
Total consideration 250,000          
Add: Fair value of investments previously owned 315,925          
Add: Non-controlling interests 416,716          
Less: Fair value of identifiable net assets acquired (849,863)          
Goodwill 132,778          
ASEEE [member]            
Disclosure of detailed information about business combination [Line Items]            
Total consideration 0          
Add: Fair value of investments previously owned 117,609          
Add: Non-controlling interests 105,464          
Less: Fair value of identifiable net assets acquired (215,233)          
Goodwill 7,840          
USIPL [member]            
Disclosure of detailed information about business combination [Line Items]            
Total consideration 313,057          
Add: Fair value of investments previously owned 0          
Add: Non-controlling interests 142,494          
Less: Fair value of identifiable net assets acquired (331,192)          
Goodwill 124,359          
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 1,816        
Less: Fair value of identifiable net assets acquired (83,482) (3,009)        
Goodwill 33,114 1,193        
SER [Member]            
Disclosure of detailed information about business combination [Line Items]            
Total consideration 217,919 7,856        
Less: Fair value of identifiable net assets acquired $ (217,919) $ (7,856)