v3.26.1
Business Combinations - Summary of Subsidiary Acquired (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
TWD ($)
HIRSCHMANN [Member]  
Disclosure of detailed information about business combination [Line Items]  
Principal Activity Holding company and the group engaged in the design and manufacturing of automotive components
Date of Acquisition Oct. 27, 2023
Proportion of Voting Equity Interests Acquired 100.00%
Total consideration $ 2,317,201
ASEPCAYMAN [Member]  
Disclosure of detailed information about business combination [Line Items]  
Principal Activity Engaged in the packaging and testing of semiconductors
Date of Acquisition Aug. 01, 2024
Proportion of Voting Equity Interests Acquired 100.00%
Total consideration $ 1,096,373
CHE [Member]  
Disclosure of detailed information about business combination [Line Items]  
Principal Activity Engaged in the packaging and testing of semiconductors
Date of Acquisition Aug. 01, 2024
Proportion of Voting Equity Interests Acquired 100.00%
Total consideration $ 1,945,678