Share-based Payment Arrangements - Summary of Fair Value using Trinomial Tree Model and Inputs (Detail) - Trinomial Tree Model [member] - Usish Employee Stock Ownership Plan Restricted Shares Two Thousand And Twenty Four [Member] |
12 Months Ended |
|---|---|
|
Dec. 31, 2025
Years
¥ / shares
| |
| Disclosure of terms and conditions of share-based payment arrangement [Line Items] | |
| Share price at the grant date | ¥ / shares | ¥ 14.19 |
| Exercise price | ¥ / shares | ¥ 14.35 |
| Bottom of range [member] | |
| Disclosure of terms and conditions of share-based payment arrangement [Line Items] | |
| Expected volatility | 35.02% |
| Lock-up periods | Years | 1 |
| Risk free interest rate | 2.11% |
| Top of range [member] | |
| Disclosure of terms and conditions of share-based payment arrangement [Line Items] | |
| Expected volatility | 37.02% |
| Lock-up periods | Years | 2 |
| Risk free interest rate | 2.27% |