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Business Combinations - Summary of Subsidiary Acquired (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($)
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% | 100.00%
Cash 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% | 100.00%
Cash Consideration | $ 1,096,373 | $ 33,436
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% | 100.00%
Cash Consideration | $ 1,945,678 | $ 59,338

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