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Commitments and Contingencies - Additional Information (Detail) $ / shares in Units, € in Thousands |  | 1 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 26, 2016 USD ($) business_day $ / shares shares | Feb. 28, 2015 USD ($) | Feb. 28, 2015 EUR (€) | Mar. 31, 2016 USD ($) lawsuit $ / shares | Dec. 31, 2015 $ / shares | Feb. 28, 2015 EUR (€) | Sep. 30, 2014 USD ($) | Sep. 30, 2014 EUR (€) | Sep. 30, 2013 USD ($) | Sep. 30, 2013 EUR (€)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 | $ 0.01 |  |  |  |  |
Number lawsuits | lawsuit |  |  |  | 2 |  |  |  |  |  |
Commercial mortgage loans [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Unfunded loan commitments |  |  |  | $ 108,883,000 |  |  |  |  |  |
Subordinate loans [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Unfunded loan commitments |  |  |  | $ 99,850,000 |  |  |  |  |  |
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 |  |  |  |  |  |  | $ 50,000,000 | € 38,000 | $ 50,000,000 | € 38,000
Unfunded Commitment, Champ L.P. [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment to invest/purchase |  | $ 3,675,000 |  |  |  | € 3,229 |  |  |  |
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 |  | $ 20,794,000 | € 16,314 |  |  |  |  |  |  |
Apollo Residential Mortgage, Inc. Merger [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate purchase price, percentage of acquiree value | 89.25% |  |  |  |  |  |  |  |  |
Purchase price value, number of business days prior to Proxy Statement | business_day | 3 |  |  |  |  |  |  |  |  |
Shares issuable under agreement, price per share (in dollars per share) | $ / shares | $ 16.75 |  |  |  |  |  |  |  |  |
Number of shares issued upon conversion | shares | 1 |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.01 |  |  |  |  |  |  |  |  |
Letter Agreement, aggregate amount payable to manager, monthly installment amount | $ 150,000 |  |  |  |  |  |  |  |  |
Series C Cumulative Redeemable Perpetual Preferred Stock [Member] | Apollo Residential Mortgage, Inc. Merger [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Dividend rate, preferred stock | 8.00% |  |  |  |  |  |  |  |  |
Apollo Residential Mortgage, Inc. [Member] | Series A Cumulative Redeemable Perpetual Preferred Stock [Member] | Apollo Residential Mortgage, Inc. Merger [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, value | $ 172,500,000 |  |  |  |  |  |  |  |  |
Dividend rate, preferred stock | 8.00% |  |  |  |  |  |  |  |  |
Champ LP [Member] | KBC Bank Deutschland AG [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  | 35.00% | 35.00% |  |
Wholly-owned Subsidiary [Member] | Champ Limited Partnership [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  | 59.00% | 59.00% |  |
Maximum [Member] | Apollo Residential Mortgage, Inc. Merger [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares issuable under agreement | shares | 13,400,000 |  |  |  |  |  |  |  |  |
Letter Agreement, aggregate amount payable to manager | $ 500,000 |  |  |  |  |  |  |  |  |
Bridge Loan [Member] | Athene Holding Ltd. [Member] | Apollo Residential Mortgage, Inc. Merger [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowing commitment | 200,000,000 |  |  |  |  |  |  |  |  |
Residential Mortgage Backed Securities [Member] | Athene Holding Ltd. [Member] | Maximum [Member] | Apollo Residential Mortgage, Inc. Merger [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Asset Purchase Agreement, sale of securities, amount | $ 1,200,000,000 |  |  |  |  |  |  |  |  |
Common Stock [Member] | Apollo Residential Mortgage, Inc. Merger [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Purchase Agreement, threshold share price (in dollars per share) | $ / shares | $ 16.75 |  |  |  |  |  |  |  |  |
Common Stock [Member] | Athene Holding Ltd. [Member] | Maximum [Member] | Apollo Residential Mortgage, Inc. Merger [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Purchase Agreement, sale of stock commitment, value | $ 20,000,000 |  |  |  |  |  |  |  |  |

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