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Business Combinations - Summary of Net Cash Outflow (Inflow) on Acquisition of Subsidiary (Detail) - 12 months ended Dec. 31, 2020
$ in Thousands, $ in Thousands
TWD ($)
USD ($)
USD ($)
SPIL [member]      
Disclosure of detailed information about business combination [Line Items]      
Total consideration $ 168,440,585    
Less: Payable for consideration representing the ordinary shares originally held by ASE (53,109,760)    
Less: Cash and cash equivalent acquired (20,088,970)    
Net cash outflow (inflow) on acquisition of subsidiaries 95,241,855    
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]      
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 12,829,372   $ 456,887
Less: Cash and cash equivalent acquired (2,349,164) $ (83,660)  
Net cash outflow (inflow) on acquisition of subsidiaries $ 8,745,638 $ 311,454