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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