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Business Combinations - Summary of Impact of Acquisitions by Comprehensive Income (Detail)
$ in Thousands, $ in Thousands
 1 Months Ended 2 Months Ended 8 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
TWD ($)
AMPI [member]          
Disclosure of detailed information about business combination [Line Items]          
Operating revenue       $ 704,243  
Net Profit (loss)       $ (217,163)  
ASEEE [member]          
Disclosure of detailed information about business combination [Line Items]          
Operating revenue         $ 1,159
Net Profit (loss)         $ (469,598)
FAFG [member]          
Disclosure of detailed information about business combination [Line Items]          
Operating revenue $ 2,043,440        
Net Profit (loss) $ 91,179        
USIPL [member]          
Disclosure of detailed information about business combination [Line Items]          
Operating revenue   $ 39,080      
Net Profit (loss)   (11,995)      
ITGEU          
Disclosure of detailed information about business combination [Line Items]          
Operating revenue   75,221 $ 2,712    
Net Profit (loss)   (4,593) (166)    
SER [Member]          
Disclosure of detailed information about business combination [Line Items]          
Operating revenue   225,017 8,112    
Net Profit (loss)   $ (508) $ (18)