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Business Combinations - Summary of Subsidiary Acquired (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
AMPI [member]    
Disclosure of detailed information about business combination [Line Items]    
Principal Activity Engaged in the manufacturing of integrated circuit  
Date of Acquisition Apr. 30, 2019  
Proportion of Voting Equity Interests Acquired 50.97% 50.97%
Cash Consideration $ 250,000  
ASEEE [member]    
Disclosure of detailed information about business combination [Line Items]    
Principal Activity Engaged in the production of embedded substrate  
Date of Acquisition Apr. 26, 2019  
Proportion of Voting Equity Interests Acquired 51.00% 51.00%
USIPL [member]    
Disclosure of detailed information about business combination [Line Items]    
Principal Activity Engaged in the design and manufacturing of electronic components and new electronic applications  
Date of Acquisition Oct. 31, 2019  
Proportion of Voting Equity Interests Acquired 60.00% 60.00%
Cash Consideration $ 313,057  
FAFG [member]    
Disclosure of detailed information about business combination [Line Items]    
Principal Activity Holding company and the group engaged in the design and manufacturing of electronic components  
Date of Acquisition Dec. 01, 2020  
Proportion of Voting Equity Interests Acquired 100.00% 100.00%
Cash Consideration $ 12,829,372 $ 456,887
SPIL [member]    
Disclosure of detailed information about business combination [Line Items]    
Principal Activity Engaged in the assembly, testing and turnkey services of integrated circuits  
Date of Acquisition Apr. 30, 2018  
Proportion of Voting Equity Interests Acquired 100.00% 100.00%
Cash Consideration $ 168,440,585