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Commitments and Contingencies - Additional Information (Details)
€ in Thousands, $ in Thousands
1 Months Ended
Feb. 28, 2015
USD ($)
Feb. 28, 2015
EUR (€)
Dec. 31, 2016
USD ($)
lawsuit
Dec. 31, 2016
EUR (€)
lawsuit
Sep. 30, 2016
USD ($)
Sep. 30, 2016
EUR (€)
Jun. 30, 2016
USD ($)
Jun. 30, 2016
EUR (€)
Dec. 31, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2014
EUR (€)
Sep. 30, 2013
USD ($)
Sep. 30, 2013
EUR (€)
Schedule of Equity Method Investments [Line Items]                          
Number of lawsuits | lawsuit     2 2                  
KBCD Partnership [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Indirect ownership interest from limited partnership                       21.00% 21.00%
BKB Bank [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Indirect ownership interest from limited partnership     9.34% 9.34%                  
Commitment to Invest in KBCD [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Commitment to invest                   $ 50,000 € 38,000 $ 50,000 € 38,000
Unfunded Commitment, Champ L.P. [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Commitment to invest     $ 2,947 € 2,802 $ 2,947 € 2,802 $ 2,947 € 2,802          
Champ LP [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Ownership interest 48.00% 48.00%                      
Proceeds from sale of equity method investments $ 20,794 € 16,314                      
Subsidiaries [Member] | Champ Limited Partnership [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Indirect ownership interest from limited partnership                   59.00% 59.00%    
Champ LP [Member] | KBC Bank Deutschland AG [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Indirect ownership interest from limited partnership                   35.00% 35.00%    
Commercial and Subordinate Mortgage Loans [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Unfunded Commitment | $                 $ 170,365