Reserve for Known and Incurred but Not Reported Claims (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Insurance [Abstract]
Provision for title loss, percentage of title premiums and escrow fees	3.25%	4.00%	4.00%
Ultimate loss rate	3.75%	4.00%	4.00%
Estimated increase in loss reserve for prior policy years		$ 0.0	$ 0.0
Percentage reserve release for prior policy years	0.50%
Reserve release for prior policy years	$ 21.6