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Business Combinations - Summary of Net Cash Outflow on Acquisition of Subsidiary (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2024
USD ($)
Disclosure of detailed information about business combination [Line Items]        
Less: Cash and cash equivalent acquired     $ (261,238)  
Net cash outflow on acquisition of subsidiaries     $ 2,354,938  
HIRSCHMANN [member]        
Disclosure of detailed information about business combination [Line Items]        
Consideration paid in Cash $ 2,317,201      
Less: Cash and cash equivalent acquired (118,419)      
Net cash outflow on acquisition of subsidiaries 2,198,782      
ASEPCAYMAN [Member]        
Disclosure of detailed information about business combination [Line Items]        
Consideration paid in Cash 725,059     $ 22,112
Less: Cash and cash equivalent acquired (404,573) $ (12,338)    
Net cash outflow on acquisition of subsidiaries 320,486 9,774    
CHE [Member]        
Disclosure of detailed information about business combination [Line Items]        
Consideration paid in Cash 1,713,092     $ 52,245
Less: Cash and cash equivalent acquired (1,381,103) (42,120)    
Net cash outflow on acquisition of subsidiaries $ 331,989 $ 10,125