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Business Combinations - Summary of Net Cash Outflow (Inflow) on Acquisition of Subsidiary (Detail)
$ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2020
TWD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Disclosure of detailed information about business combination [Line Items]        
Net cash outflow (inflow) on acquisition of subsidiaries $ 966,000      
AMPI [member]        
Disclosure of detailed information about business combination [Line Items]        
Total consideration   $ 250,000    
Less: Cash and cash equivalent acquired   (349,496)    
Net cash outflow (inflow) on acquisition of subsidiaries   (99,496)    
ASEEE [member]        
Disclosure of detailed information about business combination [Line Items]        
Total consideration   0    
Less: Cash and cash equivalent acquired   (23,197)    
Net cash outflow (inflow) on acquisition of subsidiaries   (23,197)    
USIPL [member]        
Disclosure of detailed information about business combination [Line Items]        
Total consideration   313,057    
Less: Cash and cash equivalent acquired   (108,718)    
Net cash outflow (inflow) on acquisition of subsidiaries   204,339    
FAFG [member]        
Disclosure of detailed information about business combination [Line Items]        
Total consideration   12,443,637    
Total consideration   11,094,802    
Less: Cash and cash equivalent acquired   (2,349,164)    
Net cash outflow (inflow) on acquisition of subsidiaries   8,745,638    
ITGEU        
Disclosure of detailed information about business combination [Line Items]        
Total consideration   50,368   $ 1,816
Less: Cash and cash equivalent acquired   (68,719) $ (2,477)  
Net cash outflow (inflow) on acquisition of subsidiaries   (18,351) (661)  
SER [Member]        
Disclosure of detailed information about business combination [Line Items]        
Total consideration   217,919   $ 7,856
Less: Cash and cash equivalent acquired   (18,850) (680)  
Net cash outflow (inflow) on acquisition of subsidiaries   $ 199,069 $ 7,176