Reserve for Known and Incurred but Not Reported Claims (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Insurance [Abstract]
Provision for title loss, percentage of title premiums and escrow fees	3.50%	4.00%
Ultimate loss rate	3.75%
Estimated percentage decrease in loss reserve for prior policy years	0.25%
Estimated decrease in loss reserve for prior policy years	$ 2.5
Estimated increase in loss reserve for prior policy years		$ 0.0