Investments Accounted for Using the Equity Method - Summary of Fair Values of Investments in Associates with Available Published Price Quotation (Detail) - Level 1 of fair value hierarchy [member] $ in Thousands, $ in Thousands |
Dec. 31, 2025
TWD ($)
|
Dec. 31, 2025
USD ($)
|
Dec. 31, 2024
TWD ($)
|
|---|---|---|---|
| ChipMos Technologies Inc [member] | |||
| Disclosure of associates and joint ventures [line items] | |||
| Fair value of investments in associates with available published price quotation | $ 3,720,625 | $ 118,605 | $ 2,473,841 |
| Hung Ching Development & Construction Co. [member] | |||
| Disclosure of associates and joint ventures [line items] | |||
| Fair value of investments in associates with available published price quotation | $ 1,993,695 | $ 63,554 | $ 2,601,069 |