Financial Instruments - Summary of Fair Value of Financial Instruments Not Measured at Fair Value but for Which Fair Value is Disclosed (Detail) $ in Thousands, $ in Thousands |
Dec. 31, 2025
TWD ($)
|
Dec. 31, 2025
USD ($)
|
Dec. 31, 2024
TWD ($)
|
|---|---|---|---|
| Disclosure of detailed information about financial instruments [line items] | |||
| Bonds payable | $ 14,967,630 | $ 477,132 | $ 32,976,164 |
| Fair value [member] | |||
| Disclosure of detailed information about financial instruments [line items] | |||
| Bonds payable | $ 15,583,145 | $ 496,753 | $ 33,636,945 |