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Acquisitions - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2022
Dec. 31, 2021
Business Acquisition [Line Items]            
Payment to acquire business net of cash acquired     $ 15,000,000.0 $ 103,800,000    
Goodwill $ 198,300,000   198,300,000     $ 188,300,000
Contingent consideration liability fixed in value 8,700,000   8,700,000      
Contingent liabilities undiscounted maximum payment 21,700,000   21,700,000      
Future consideration to be paid to the acquirees 43,100,000   43,100,000      
Compensation expenses $ 3,700,000 $ 7,200,000 $ 11,400,000 $ 11,400,000    
Title Insurance and Escrow Settlement Services Company and Real Estate Brokerage            
Business Acquisition [Line Items]            
Ownership interest acquired (in percent) 100.00%   100.00%      
Payment to acquire business net of cash acquired     $ 12,100,000      
Additional cash payable $ 3,600,000   3,600,000      
Recognized identifiable assets and liabilities assumed, other assets 1,000,000   1,000,000      
Recognized identifiable assets and liabilities assumed, other liabilities 2,500,000   2,500,000      
Goodwill 8,800,000   8,800,000      
Goodwill, expected tax deductible amount 0   $ 0      
Title Insurance and Escrow Settlement Services Company and Real Estate Brokerage | Forecast            
Business Acquisition [Line Items]            
Goodwill, expected tax deductible amount         $ 2,600,000  
Title Insurance and Escrow Settlement Services Company and Real Estate Brokerage | Minimum            
Business Acquisition [Line Items]            
Useful life (in years)     3 years      
Title Insurance and Escrow Settlement Services Company and Real Estate Brokerage | Maximum            
Business Acquisition [Line Items]            
Useful life (in years)     5 years      
Title Insurance and Escrow Settlement Services Company and Real Estate Brokerage | Customer Relationships            
Business Acquisition [Line Items]            
Recognized identifiable assets and liabilities assumed, intangible assets, other than goodwill 8,100,000   $ 8,100,000      
Title Insurance and Escrow Settlement Services Company and Real Estate Brokerage | Trademarks            
Business Acquisition [Line Items]            
Recognized identifiable assets and liabilities assumed, intangible assets, other than goodwill $ 1,100,000   1,100,000      
Title Insurance and Escrow Settlement Services Company and Real Estate Brokerage | Common Class A            
Business Acquisition [Line Items]            
Equity interest issued or issuable     $ 800,000