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ORGANIZATION AND BASIS OF PRESENTATION - Summary of General Terms and Operating Partnership's Equity Interests (Details) - USD ($) |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 10, 2016 | Sep. 30, 2016 | Dec. 31, 2013
Fund II |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Payments of dividends |  |  | $ 47,100,000
Operating Partnership | Fund I and Mervyns I |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Operating Partnership Share of Capital |  | 22.22% |
Fund Size |  | $ 90,000,000 |
Capital Called |  | 86,600,000 |
Unfunded Commitment as of September 30, 2016 |  | $ 0 |
Equity Interest Held By Operating Partnership |  | 37.78% |
Preferred Return |  | 9.00% |
Capital Returned |  | $ 194,500,000 |
Operating Partnership | Fund II and Mervyns II |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Operating Partnership Share of Capital |  | 28.33% |
Fund Size |  | $ 300,000,000 |
Capital Called |  | 300,000,000 |
Unfunded Commitment as of September 30, 2016 |  | $ 47,100,000 |
Equity Interest Held By Operating Partnership |  | 28.33% |
Preferred Return |  | 8.00% |
Capital Returned |  | $ 131,600,000 |
Operating Partnership | Fund III |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Operating Partnership Share of Capital |  | 24.54% |
Fund Size |  | $ 502,500,000 |
Capital Called |  | 396,700,000 |
Unfunded Commitment as of September 30, 2016 |  | $ 53,300,000 |
Equity Interest Held By Operating Partnership |  | 24.54% |
Preferred Return |  | 6.00% |
Capital Returned |  | $ 509,800,000 |
Operating Partnership | Fund IV |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Operating Partnership Share of Capital |  | 23.12% |
Fund Size |  | $ 540,600,000 |
Capital Called |  | 290,500,000 |
Unfunded Commitment as of September 30, 2016 |  | $ 239,500,000 |
Equity Interest Held By Operating Partnership |  | 23.12% |
Preferred Return |  | 6.00% |
Capital Returned |  | $ 101,900,000 |
Operating Partnership | Fund V |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Operating Partnership Share of Capital |  | 20.10% |
Fund Size | $ 520,100,000.0 | $ 520,100,000 |
Capital Called | $ 0 | 0 |
Unfunded Commitment as of September 30, 2016 |  | $ 520,100,000 |
Equity Interest Held By Operating Partnership |  | 20.10% |
Preferred Return |  | 6.00% |
Capital Returned |  | $ 0 |

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