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Reserve for Known and Incurred but Not Reported Claims (Narrative) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Insurance [Abstract]        
Provision for title loss, percentage of title premiums and escrow fees 3.50% 4.00% 3.50% 4.00%
Ultimate loss rate     3.75%  
Estimated increase in loss reserve for prior policy years       $ 0.0
Estimated percentage decrease in loss reserve for prior policy years 0.25%   0.25%  
Estimated decrease in loss reserve for prior policy years $ 2.9   $ 5.4