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ORGANIZATION AND BASIS OF PRESENTATION (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 10, 2016 USD ($) Institutional_Investor | Sep. 30, 2016 USD ($) property | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) property | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |
Number of retail properties (in properties) | property |  | 175 |  |  | 175 |  |
Reallocation of noncontrolling interest |  | $ 35,300,000 |  |  | $ 0 |  | $ 31,800,000
Impairment of asset |  | $ 0 | $ 0 |  | $ 0 | $ 5,000,000 |
Brandywine Portfolio |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage |  |  |  | 77.78% |  |  |
Impairment of asset |  |  |  | $ 5,000,000 |  |  |
Core Portfolio |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |
Number of retail properties (in properties) | property |  | 116 |  |  | 116 |  |
Impairment of asset |  |  |  |  |  | 5,000,000 |
Opportunity Funds |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |
Number of retail properties (in properties) | property |  | 59 |  |  | 59 |  |
Impairment of asset |  |  |  |  |  | $ 0 |
Operating Partnership | Fund V |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |
Ownership interest by general partner or managing partner |  |  |  |  | 20.10% |  |
Equity commitment, amount | $ 520,100,000.0 | $ 520,100,000 |  |  | $ 520,100,000 |  |
Number of institutional investors | Institutional_Investor | 12 |  |  |  |  |  |
Closed equity commitments | $ 104,500,000.0 |  |  |  |  |  |
Preferred Return |  |  |  |  | 6.00% |  |
Capital Called | $ 0 |  |  |  | $ 0 |  |
Operating Partnership | Brandywine Portfolio |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |
Impairment of asset |  |  |  | $ 1,100,000 |  |  |
Mortgages |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |
Debt instrument face amount |  | 129,044,000 |  |  | 129,044,000 |  |
Non-Recourse Mortgage Debt Due 2016 | Mortgages |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |
Debt instrument face amount |  | $ 26,300,000.0 |  |  | $ 26,300,000.0 |  |
Operating Partnership, as General Partner or Managing Member |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |
Ownership interest by general partner or managing partner |  |  |  |  | 95.00% |  |
Remaining funds rate of distribution to partnership |  | 20.00% |  |  | 20.00% |  |
Institutional Investors |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |
Remaining funds rate of distribution to all partners |  | 80.00% |  |  | 80.00% |  |

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