Investments in and Advances to Unconsolidated Joint Ventures (Narrative) (Details) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			9 Months Ended	1 Months Ended	9 Months Ended		12 Months Ended		3 Months Ended		9 Months Ended
	Jan. 26, 2012	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2012 Equity One, Inc. [Member]	Sep. 30, 2011 Equity One, Inc. [Member]	Sep. 30, 2012 Equity One, Inc. [Member]	Sep. 30, 2011 Equity One, Inc. [Member]	Sep. 30, 2012 New York State Common Retirement Fund [Member]	Sep. 30, 2012 New York State Common Retirement Fund [Member] Equity One, Inc. [Member]	Jan. 26, 2012 Pari Passu [Member]	Sep. 30, 2012 Unconsolidated Joint Venture [Member]	Dec. 31, 2011 Unconsolidated Joint Venture [Member]	Dec. 31, 2011 Massachusetts [Member] New York State Common Retirement Fund [Member] Equity One, Inc. [Member]	Sep. 30, 2012 Florida [Member] Equity One, Inc. [Member]	Sep. 30, 2012 Management Fees [Member]	Sep. 30, 2011 Management Fees [Member]	Sep. 30, 2012 Leasing Fees [Member]	Sep. 30, 2011 Leasing Fees [Member]
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated joint ventures		$ 469,000	$ 4,426,000	$ 129,000	$ 4,694,000
Fees paid associated with these joint ventures, which are included in management and leasing services revenue																		497,000	442,000	1,800,000	1,500,000
Equity Method Investment, Summarized Financial Information, Liabilities														223,900,000	249,900,000
Unconsolidated joint venture debt, entity pro-rata share														45,100,000	54,500,000
Equity Method Investment, Repayment of Debt														21,100,000
Payments to Acquire Interest in Joint Venture				14,102,000	9,874,000									7,500,000
Joint venture aggregate purchase price																23,200,000
Mortgage debt	18,500,000											10,400,000	71,400,000
Financing Receivable, Net		64,687,000		64,687,000		45,279,000
Joint venture's mortgage loan bears interest	6.25%
Joint ventures mortgage loan maturity in years	9 years
Mezzanine financing interest	10.00%
Mezzanine financing interest maturity in years	9 years
Joint venture purchase price	143,000,000
Predetermined fixed amount of joint venture purchase price	$ 128,400,000
Ownership interests in properties through joint ventures											70.00%						30.00%