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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Loss Contingencies [Line Items]    
Letters of credit outstanding $ 48,000,000  
Accrued loan loss 23,400,000 $ 21,800,000
Assets available for recourse 300,600,000  
Warehouse receivables $ 130,700,000  
Letters of credit expiration date 2017-06  
Guarantees total $ 55,000,000  
Commitments to investment in future real estate investment 36,500,000  
Commitments to investment in unconsolidated real estate subsidiary 28,600,000  
Funded loans subject to loss sharing arrangements [Member]    
Loss Contingencies [Line Items]    
Funded loans unpaid principal 13,500,000,000  
Funded loans not subject to loss sharing arrangements [Member]    
Loss Contingencies [Line Items]    
Letters of credit outstanding $ 42,000,000 $ 35,000,000
Maximum [Member]    
Loss Contingencies [Line Items]    
Co-investments typically range 2.00%