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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 |  |  |  |  |  |  |  |  |

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