Beneficial Interest in Debt and Interest Expense (Specific Debt Instrument Detail) (USD $)				6 Months Ended				6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2011 Fair Oaks [Member]	Jun. 30, 2011 Fair Oaks [Member] Secured Debt [Member]	Jun. 30, 2011 International Plaza [Member] Secured Debt [Member]	Jun. 30, 2011 Regency Square [Member] Secured Debt [Member]	Jun. 30, 2011 The Pier Shops [Member] Secured Debt [Member]	Jun. 30, 2011 Primary Line of Credit [Member]	Jun. 30, 2011 Secondary Line of Credit [Member]
Debt Instrument [Line Items]
Principal amount of non-recourse financing				$ 250,000,000	$ 272,400,000
Debt, unconsolidated joint ventures at beneficial interest	571,600,000	575,103,000
Maturity date of debt				April 2012	January 2012
Derivative, Fixed Interest Rate				4.22%
Amount of principal balance required to be paid down					52,600,000
Amount of principal balance required to be paid down, at beneficial interest					26,400,000
Debt	2,504,342,000	2,656,560,000	250,000,000
Principal of loan at beneficial interest	2,171,491,000	2,297,460,000			136,500,000
Fixed rate prior to maturity of interest rate swap (in hundredths)					5.01%	6.75%	6.01%
Additional Default Rate						4.00%	4.00%
Maturity date of interest rate swap				April 2011	January 2011
Ownership percentage in unconsolidated joint venture (in hundredths)			50.00%
Interest rate terms				LIBOR	LIBOR			LIBOR
Credit spread on the loan (in hundredths)				1.40%	1.15%			0.70%
Line of credit, maximum borrowing capacity								550,000,000
Line of credit, expiration date								February 2012	April 2012
Line of credit, maximum borrowing capacity including letter of credit									65,000,000
Line of credit, maximum borrowing capacity excluding letter of credit									40,000,000
Letter of credit required by lessor									25,000,000
Debt default, amount						72,200,000	135,000,000
Book value of investment						$ 29,000,000	$ 41,000,000