Contents of Significant Accounts - Operating Costs and Expenses - Additional Information (Detail) |
12 Months Ended |
|---|---|
Dec. 31, 2025 | |
| Bottom of range [member] | |
| Disclosure Of Operating Costs And Expenses [Line Items] | |
| Percentage of employees' compensation should be allocated to entry-level employees | 30.00% |
| Allocated profit percentage for employees' compensation | 5.00% |
| Top of range [member] | |
| Disclosure Of Operating Costs And Expenses [Line Items] | |
| Allocated profit percentage for directors' compensation | 0.20% |