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v3.25.1

Significant Contingent Liabilities and Unrecognized Commitments - Additional Information (Detail) $ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2024 USD ($)
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Unused letters of credit |  | $ 3,139,000 |  | $ 134,000 |  | $ 95,730
Committed to purchase property, plant and equipment |  | 118,263,200 |  | 56,943,589 |  | 3,606,685
Prepayment of property, plant and equipment |  | 5,890,890 | $ 179,655 | 9,016,441 |  |
Letter of credits |  | 708,130 |  | 645,255 |  | $ 21,596
Approved contribution in consideration of corporate social responsibility for environmental protection |  | 100,000 |  |  |  |
Amount contributed related party transactions |  | 112,500 | 3,431 | 125,000 | $ 120,000 |
ASE Environmental Protection And Sustainability Foundation [Member] |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Amount contributed related party transactions |  | 100,000 | 3,050 | 100,000 | 100,000 |
ASE Cultural and Educational Foundation [member] |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Amount contributed related party transactions |  | 12,500 | 381 | $ 25,000 | $ 20,000 |
Amount contributed related party transactions |  | 10,000 | $ 305 |  |  |
Taiwan [member] |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Contractual period for environmental protection | 30 years |  |  |  |  |
Contribution to be made for environmental protection |  | $ 3,000,000 |  |  |  |

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