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Reserve for Known and Incurred but Not Reported Claims (Narrative) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Insurance [Abstract]      
Provision for title loss, percentage of title premiums and escrow fees 3.00% 3.25% 4.00%
Ultimate loss rate 3.75% 3.75% 4.00%
Estimated increase in loss reserve for prior policy years     $ 0.0
Percentage reserve release for prior policy years 0.75% 0.50%  
Reserve release for prior policy years $ 34.6 $ 21.6