Related Party Transactions - Summary of Transactions Between Related Parties (Detail) $ in Thousands, $ in Thousands |
12 Months Ended | |||
|---|---|---|---|---|
|
Dec. 31, 2025
TWD ($)
|
Dec. 31, 2025
USD ($)
|
Dec. 31, 2024
TWD ($)
|
Dec. 31, 2023
TWD ($)
|
|
| Disclosure of transactions between related parties [line items] | ||||
| Amount contributed related party transactions | $ 117,500 | $ 3,746 | $ 112,500 | $ 125,000 |
| ASE Environmental Protection And Sustainability Foundation [Member] | ||||
| Disclosure of transactions between related parties [line items] | ||||
| Amount contributed related party transactions | 100,000 | 3,188 | 100,000 | 100,000 |
| ASE Cultural and Educational Foundation [member] | ||||
| Disclosure of transactions between related parties [line items] | ||||
| Amount contributed related party transactions | $ 17,500 | $ 558 | $ 12,500 | $ 25,000 |