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Credit Facilities and Notes Payable - Additional Information (Details)
 9 Months Ended
Sep. 30, 2021
USD ($)
Facility
Aug. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Line Of Credit Facility [Line Items]      
Number of facilities | Facility 3    
Borrowing Capacity $ 1,025,000,000   $ 425,000,000
Financial Institutions [Member]      
Line Of Credit Facility [Line Items]      
Number of facilities | Facility 2    
Related Parties [Member]      
Line Of Credit Facility [Line Items]      
Number of facilities | Facility 1    
Senior Secured Credit Facilities With Financial Institutions 1 [Member]      
Line Of Credit Facility [Line Items]      
Borrowing Capacity     200,000,000.0
Borrowing Capacity $ 400,000,000.0    
Uncommitted amount $ 100,000,000    
Maturity term 12 months    
Senior Secured Credit Facilities With Financial Institutions 1 [Member] | London Interbank Offered Rate (LIBOR)      
Line Of Credit Facility [Line Items]      
Interest rate margin 2.50%    
Senior Secured Credit Facilities With Financial Institutions 2 [Member]      
Line Of Credit Facility [Line Items]      
Line Of Credit Facility Maximum Amount Outstanding During Period $ 300,000,000.0    
Line Of Credit Facility Expiration Period 24 months    
Line Of Credit Additional Borrowing Capacity $ 100,000,000.0    
Senior Secured Credit Facilities With Financial Institutions 2 [Member] | London Interbank Offered Rate (LIBOR)      
Line Of Credit Facility [Line Items]      
Interest rate margin 2.50%    
Senior Secured Credit Facility [Member]      
Line Of Credit Facility [Line Items]      
Interest rate margin 5.74%    
Debt instrument, interest rate 5.79%    
Revolving Credit Facility [Member]      
Line Of Credit Facility [Line Items]      
Borrowing Capacity $ 225,000,000   225,000,000
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR)      
Line Of Credit Facility [Line Items]      
Interest rate margin 4.00%    
Mezzanine Credit Facility With Related Party [Member]      
Line Of Credit Facility [Line Items]      
Debt instrument, interest rate 13.00%    
First American Credit Agreement [Member]      
Line Of Credit Facility [Line Items]      
Borrowing amount under credit agreement   $ 25,000,000.0  
Loans, outstanding amount   $ 0  
First American Credit Agreement [Member] | First American Title Insurance Company      
Line Of Credit Facility [Line Items]      
Related party, holding percentage 5.00%    
Borrowing amount under credit agreement $ 30,000,000.0    
Debt instrument, interest rate 12.00%    
Secured Promissory Note [Member]      
Line Of Credit Facility [Line Items]      
Secured Debt $ 4,300,000    
Repayments of Secured Debt $ 3,800,000    
Unsecured Notes Payable [Member]      
Line Of Credit Facility [Line Items]      
Unsecured Notes Payable     1,300
Unsecured Notes Payable to Related Party     $ 2,400