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Acquisitions - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2023
Dec. 31, 2022
Business Acquisition [Line Items]            
Goodwill $ 203,800,000   $ 203,800,000     $ 198,400,000
Contingent liabilities undiscounted maximum payment 29,100,000   29,100,000      
Contingent consideration liability fixed in value 3,100,000   3,100,000      
Future consideration to be paid to the acquirees 2,000,000   2,000,000      
Compensation income, future services $ (1,100,000)          
Compensation expenses, future services   $ 3,700,000 $ 2,000,000 $ 11,400,000    
Common stock granted to sellers (in shares)     2,600,000      
Real Estate Brokerage            
Business Acquisition [Line Items]            
Ownership interest acquired (in percent) 100.00%   100.00%      
Purchase price at time of acquisition     $ 8,800,000      
Recognized identifiable assets and liabilities assumed, other assets $ 1,500,000   1,500,000      
Recognized identifiable assets and liabilities assumed, other liabilities 1,100,000   1,100,000      
Goodwill 5,300,000   5,300,000      
Goodwill, expected tax deductible amount 0   0      
Real Estate Brokerage | Customer Relationships            
Business Acquisition [Line Items]            
Recognized identifiable assets and liabilities assumed, intangible assets, other than goodwill $ 3,100,000   $ 3,100,000      
Useful life (in years) 5 years   5 years      
Real Estate Brokerage | Forecast            
Business Acquisition [Line Items]            
Goodwill, expected tax deductible amount         $ 5,300,000