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v3.22.1

Significant Contingent Liabilities and Unrecognized Commitments - Additional Information (Detail) $ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2021 USD ($)
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Unused letters of credit |  | $ 74,000 |  | $ 2,000 |  | $ 2,668
Committed to purchase property, plant and equipment |  | 52,678,554 |  | 32,627,411 |  | 1,899,011
Prepayment of property, plant and equipment |  | 3,761,120 | $ 135,585 | 1,968,779 |  |
Construction contract related to real estate business |  | 59 | 2 | 602,548 |  |
Letter of credits |  | 738,628 |  | 671,721 |  | 26,627
Approved contribution in consideration of corporate social responsibility for environmental protection |  | 100,000 |  |  |  | 3,605
Amount contributed related party transactions |  | 110,000 | 3,965 | 100,000 | $ 100,000 |
ASE Environmental Protection And Sustainability Foundation [Member] |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Amount contributed related party transactions |  | 100,000 | 3,605 | $ 100,000 | $ 0 |
ASE Cultural and Educational Foundation [Member] |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Amount contributed related party transactions |  | 20,000 | $ 721 |  |  |
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 |  |  |  | $ 108,147

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