Reserve for Known and Incurred but Not Reported Claims (Narrative) (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Insurance [Abstract] | ||||
| Provision for title loss, percentage of title premiums and escrow fees | 3.00% | 3.00% | 3.00% | 3.00% |
| Ultimate loss rate | 3.75% | 3.75% | ||
| Percentage reserve releases for prior policy years | 0.75% | 0.75% | ||
| Reserve releases for prior policy years | $ 11.4 | $ 10.5 | $ 32.5 | $ 28.8 |