ORGANIZATION AND BASIS OF PRESENTATION Summary of General Terms and Operating Partnership's Equity Interests (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Fund I and Mervyns I
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Operating Partnership Share of Capital	22.22%	[1]
Committed Capital	$ 90.0	[1],[2]
Capital Called as of March 31, 2013	86.6	[1],[2]
Ownership Interest By General Partner or Managing Partner	37.78%	[1]
Preferred Return	9.00%	[1]
Capital Returned as of March 31, 2013	86.6	[1],[2]
Fund II and Mervyns II
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Operating Partnership Share of Capital	20.00%
Committed Capital	300.0	[2]
Capital Called as of March 31, 2013	300.0	[2]
Ownership Interest By General Partner or Managing Partner	20.00%
Preferred Return	8.00%
Capital Returned as of March 31, 2013	84.5	[2]
Fund III
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Operating Partnership Share of Capital	19.90%
Committed Capital	475.0	[2]
Capital Called as of March 31, 2013	353.5	[2]
Ownership Interest By General Partner or Managing Partner	19.90%
Preferred Return	6.00%
Capital Returned as of March 31, 2013	196.8	[2]
Fund IV
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Operating Partnership Share of Capital	23.12%
Committed Capital	540.6	[2]
Capital Called as of March 31, 2013	74.0	[2]
Ownership Interest By General Partner or Managing Partner	23.12%
Preferred Return	6.00%
Capital Returned as of March 31, 2013	$ 0	[2]

[1] Fund I and Mervyns I have returned all capital and preferred return. The Operating Partnership is now entitled to a Promote on all future cash distributions.

[2] Represents the total for the Opportunity Funds, including the Operating Partnership and noncontrolling interests' shares.