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Operating Segment Information - Individual Customers Accounting for at least 10% of Operating Revenues (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Disclosure of Major Customers [Line Items] |  |  |  |
Operating revenues | $ 232,302,584 | $ 7,084,556 | $ 222,533,000 | $ 278,705,264
Customer concentration risk [member] | Wafer fabrication [member] | Customer A [member] |  |  |  |
Disclosure of Major Customers [Line Items] |  |  |  |
Operating revenues | $ 24,180,535 |  |  |
Customer concentration risk [member] | Wafer fabrication [member] | Customer B [member] |  |  |  |
Disclosure of Major Customers [Line Items] |  |  |  |
Operating revenues |  |  | $ 29,242,973 |

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