Financial Assets at Fair Value Through Other Comprehensive Income - Summary of Investments in Debt Instruments at Fair Value Through Other Comprehensive Income (Detail) $ in Thousands, $ in Thousands |
Dec. 31, 2025
TWD ($)
|
Dec. 31, 2025
USD ($)
|
Dec. 31, 2024
TWD ($)
|
|---|---|---|---|
| Financial assets at fair value through other comprehensive income [line items] | |||
| Investments in debt instruments at FVTOCI | $ 1,008,140 | $ 32,137 | $ 1,025,760 |
| Unsecured cumulative subordinate corporate bonds [member] | |||
| Financial assets at fair value through other comprehensive income [line items] | |||
| Investments in debt instruments at FVTOCI | $ 1,008,140 | $ 32,137 | $ 1,025,760 |