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SUBSEQUENT EVENTS (Details) (USD $) In Millions, unless otherwise specified			1 Months Ended
	Jun. 30, 2012 Fund IV Institutional_Investor	Jul. 31, 2012 Fund IV Issuance of equity Institutional_Investor	Jul. 31, 2012 83 Spring Street New York New York Acquisition sqft	Jul. 31, 2012 125 Main Street, Westport Westport, Connecticut Sale
Subsequent Event [Line Items]
Square Footage of Real Estate Property (in square feet)			4,800
Business Acquisition, Cost of Acquired Entity, Purchase Price			$ 11.5
Equity Method Investment, Additional Third Party Equity Commitments		117.5
Additional Number of Institutional Investors (in Institutional Investors)		9
Equity Method Investment, Third Party Equity Commitments	347.6	465.1
Number of Institutional Investors (in institutional investors)	8	17
Equity Method Investment, Equity Commitment	100.0	100.0
Contract to Sell				$ 33.5