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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Loss Contingencies [Line Items]    
Letters of credit outstanding $ 69,300,000  
Accrued loan loss 32,100,000 $ 32,900,000
Assets available for recourse 632,800,000  
Warehouse receivables $ 397,600,000  
Letters of credit expiration date 2019-03  
Guarantees total $ 61,500,000  
Commitments to investment in future real estate investment 35,100,000  
Commitments to investment in unconsolidated real estate subsidiary $ 17,400,000  
Maximum [Member]    
Loss Contingencies [Line Items]    
Co-investments typically range 2.00%  
Funded loans subject to loss sharing arrangements [Member]    
Loss Contingencies [Line Items]    
Funded loans unpaid principal $ 20,400,000,000  
Letters of credit outstanding 58,000,000 58,000,000
SBL Program [Member]    
Loss Contingencies [Line Items]    
Letters of credit outstanding 5,000,000 $ 5,000,000
Funded loans not subject to loss sharing arrangements [Member]    
Loss Contingencies [Line Items]    
Letters of credit outstanding $ 63,000,000