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ORGANIZATION AND BASIS OF PRESENTATION - Summary of General Terms and Operating Partnership's Equity Interests (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2013
Fund II |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Payments of dividends |  | $ 47.1
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 | $ 90.0 |
Capital Called | 86.6 |
Unfunded Commitment | $ 0.0 |
Equity Interest Held By Operating Partnership | 37.78% |
Preferred Return | 9.00% |
Capital Returned | $ 194.5 |
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 | $ 300.0 |
Capital Called | 300.0 |
Unfunded Commitment | $ 47.1 |
Equity Interest Held By Operating Partnership | 28.33% |
Preferred Return | 8.00% |
Capital Returned | $ 131.6 |
Operating Partnership | Fund III |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Operating Partnership Share of Capital | 24.54% |
Fund Size | $ 502.5 |
Capital Called | 387.5 |
Unfunded Commitment | $ 62.5 |
Equity Interest Held By Operating Partnership | 39.63% |
Preferred Return | 6.00% |
Capital Returned | $ 497.7 |
Operating Partnership | Fund IV |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Operating Partnership Share of Capital | 23.12% |
Fund Size | $ 540.6 |
Capital Called | 239.3 |
Unfunded Commitment | $ 301.2 |
Equity Interest Held By Operating Partnership | 23.12% |
Preferred Return | 6.00% |
Capital Returned | $ 101.9 |

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