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Commitments and Contingencies - Additional Information (Detail)
€ in Thousands, $ in Thousands
1 Months Ended
Oct. 01, 2015
USD ($)
business_day
Feb. 28, 2015
USD ($)
Feb. 28, 2015
EUR (€)
Sep. 30, 2015
USD ($)
Sep. 29, 2015
USD ($)
Feb. 28, 2015
EUR (€)
Sep. 30, 2014
USD ($)
Sep. 30, 2014
EUR (€)
Sep. 30, 2013
USD ($)
Sep. 30, 2013
EUR (€)
Commercial mortgage loans [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Unfunded loan commitments       $ 124,729            
Subordinate loans [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Unfunded loan commitments       $ 226,266            
KBCD Partnership [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Ownership interest                 21.00% 21.00%
BKB Bank [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Ownership interest       11.00%            
Commitment to Invest in KBCD [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Commitment to invest/purchase             $ 50,000 € 38,000 $ 50,000 € 38,000
Unfunded Commitment, Champ L.P. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Commitment to invest/purchase   $ 3,609       € 3,229        
Commitment to purchase real estate loan portfolio [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Commitment to invest/purchase         $ 375,355          
Champ LP [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Sale of equity method investment, percentage   48.00% 48.00%              
Proceeds from sale of equity method investments   $ 20,794 € 16,314              
MidCap [Member] | Subsequent Event [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of business days purchase option is exercisable | business_day 30                  
Agreement fee payment proceeds $ 750