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Commitments and Contingencies (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Loss Contingencies [Line Items]    
Funded loans unpaid principal $ 34,100,000,000  
Letters of credit outstanding 144,000,000.0  
Accrued loan loss 58,800,000 $ 57,100,000
Assets available for recourse 677,500,000  
Guarantees total 42,100,000  
Commitments to investment in future real estate investment 91,100,000  
Commitments to investment in unconsolidated real estate subsidiary 31,300,000  
Forbearance Of Loans, CARES Act    
Loss Contingencies [Line Items]    
Advances for principal and interest 7,700,000  
Reimbursement of advances $ 5,500,000  
Maximum    
Loss Contingencies [Line Items]    
Co-investments typically range 2.00%  
Warehouse Receivable    
Loss Contingencies [Line Items]    
Warehouse receivables $ 194,300,000  
Funded loans subject to loss sharing arrangements    
Loss Contingencies [Line Items]    
Funded loans unpaid principal 29,500,000,000  
SBL Program    
Loss Contingencies [Line Items]    
Letters of credit outstanding $ 5,000,000.0  
Percentage of maximum original principal amount loan loss 10.00%  
Funded loans not subject to loss sharing arrangements    
Loss Contingencies [Line Items]    
Letters of credit outstanding $ 95,000,000.0 $ 95,000,000.0