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Equity - Summary of Shares Held By Subsidiaries (Detail) shares in Thousands, $ in Thousands, $ in Thousands | Dec. 31, 2024 TWD ($) shares | Dec. 31, 2024 USD ($) shares | Dec. 31, 2023 TWD ($) shares
--- | --- | --- | ---
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries (in thousands) | 72,941 | 72,941 | 72,941
Shares Held By Subsidiaries, Value | $ 1,959,107 | $ 59,747 | $ 1,959,107
ASE [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries (in thousands) | 67,452 | 67,452 | 67,452
Shares Held By Subsidiaries, Value | $ 1,762,430 | $ 53,749 | $ 1,762,430
ASE Test, Inc. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries (in thousands) | 5,489 | 5,489 | 5,489
Shares Held By Subsidiaries, Value | $ 196,677 | $ 5,998 | $ 196,677
Fair value [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries, Value | 11,816,524 | 360,370 | 9,847,103
Fair value [member] | ASE [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries, Value | 10,927,243 | 333,249 | 9,106,036
Fair value [member] | ASE Test, Inc. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries, Value | $ 889,281 | $ 27,121 | $ 741,067

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