Contents of Significant Accounts - Refund Liabilities - Summary of Refund Liabilities (classified under other current liabilities) (Detail) - TWD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure Of Refund Liability [Abstract] | ||
| Refund liabilities | $ 4,309,253 | $ 3,918,437 |