INVESTMENTS IN AND ADVANCES TO UNCONSOLIDATED AFFILIATES (Details) (USD $)	3 Months Ended								12 Months Ended																							12 Months Ended						12 Months Ended						81 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended			63 Months Ended	12 Months Ended			12 Months Ended			67 Months Ended		12 Months Ended					12 Months Ended			0 Months Ended	12 Months Ended
	Dec. 31, 2011 properties	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011 properties	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Unconsolidated Affiliates [Member]	Dec. 31, 2010 Unconsolidated Affiliates [Member]	Dec. 31, 2009 Unconsolidated Affiliates [Member]	Dec. 31, 2011 Operating Partnership, as General Partner or Managing Member [Member]	Dec. 31, 2010 Operating Partnership, as General Partner or Managing Member [Member]	Dec. 31, 2009 Operating Partnership, as General Partner or Managing Member [Member]	Dec. 31, 2011 KLA/Mervyns LLC Add-On Investments [Member]	Dec. 31, 2011 KLA A Markets LLC Add-On Investments [Member]	Dec. 31, 2011 KA-Shopko LLC [Member]	Dec. 31, 2011 Marsh and Add-On Investments [Member]	Dec. 31, 2011 KLAC Rex Venture LLC [Member]	Dec. 31, 2011 KLA/Mervyns LLC [Member]	Dec. 31, 2011 KLA A Markets LLC [Member]	Dec. 31, 2011 Mervyns I and Mervyns II [Member] KLA/Mervyns LLC Add-On Investments [Member]	Dec. 31, 2011 Mervyns I and Mervyns II [Member] KLA/Mervyns LLC [Member]	Dec. 31, 2011 Mervyns II [Member] KLA A Markets LLC Add-On Investments [Member]	Dec. 31, 2011 Mervyns II [Member] KLAC Rex Venture LLC [Member]	Dec. 31, 2011 Mervyns II [Member] KLA A Markets LLC [Member]	Dec. 31, 2011 Fund II [Member] KA-Shopko LLC [Member]	Dec. 31, 2011 Fund II [Member] Marsh and Add-On Investments [Member]	Dec. 31, 2011 Core Portfolio [Member]	Dec. 31, 2010 Core Portfolio [Member]	Dec. 31, 2009 Core Portfolio [Member]	Dec. 31, 2011 Core Portfolio [Member] Brandywine Portfolio [Member] sqft	Dec. 31, 2011 Core Portfolio [Member] Crossroads [Member] sqft	Sep. 30, 2011 Core Portfolio [Member] Georgetown Portfolio [Member] properties	Dec. 31, 2011 Opportunity Funds [Member]	Dec. 31, 2010 Opportunity Funds [Member]	Dec. 31, 2009 Opportunity Funds [Member]	Dec. 31, 2011 Opportunity Funds [Member] RCP Venture [Member]	Dec. 31, 2011 Opportunity Funds [Member] RCP Venture [Member] Operating Partnership, as General Partner or Managing Member [Member]	Dec. 31, 2011 Opportunity Funds [Member] Mervyns I and Mervyns II [Member] KLA/Mervyns LLC Add-On Investments [Member]	Dec. 31, 2011 Opportunity Funds [Member] Mervyns I and Mervyns II [Member] KLA/Mervyns LLC Add-On Investments [Member]	Dec. 31, 2011 Opportunity Funds [Member] Mervyns I and Mervyns II [Member] KLA/Mervyns LLC Add-On Investments [Member] Operating Partnership, as General Partner or Managing Member [Member]	Dec. 31, 2004 Opportunity Funds [Member] Mervyns I and Mervyns II [Member] KLA/Mervyns LLC [Member]	Dec. 31, 2011 Opportunity Funds [Member] Mervyns I and Mervyns II [Member] KLA/Mervyns LLC [Member] stores	Dec. 31, 2011 Opportunity Funds [Member] Mervyns I and Mervyns II [Member] KLA/Mervyns LLC [Member] Operating Partnership, as General Partner or Managing Member [Member]	Dec. 31, 2011 Opportunity Funds [Member] Mervyns II [Member] KLA A Markets LLC Add-On Investments [Member]	Dec. 31, 2011 Opportunity Funds [Member] Mervyns II [Member] KLA A Markets LLC Add-On Investments [Member]	Dec. 31, 2011 Opportunity Funds [Member] Mervyns II [Member] KLA A Markets LLC Add-On Investments [Member] Operating Partnership, as General Partner or Managing Member [Member]	Dec. 31, 2011 Opportunity Funds [Member] Mervyns II [Member] KLAC Rex Venture LLC [Member]	Jul. 31, 2007 Opportunity Funds [Member] Mervyns II [Member] KLAC Rex Venture LLC [Member] retail_properties	Dec. 31, 2011 Opportunity Funds [Member] Mervyns II [Member] KLAC Rex Venture LLC [Member] Operating Partnership, as General Partner or Managing Member [Member]	Dec. 31, 2011 Opportunity Funds [Member] Mervyns II [Member] KLA A Markets LLC [Member]	Dec. 31, 2010 Opportunity Funds [Member] Mervyns II [Member] KLA A Markets LLC [Member]	Dec. 31, 2011 Opportunity Funds [Member] Mervyns II [Member] KLA A Markets LLC [Member]	Jun. 30, 2006 Opportunity Funds [Member] Mervyns II [Member] KLA A Markets LLC [Member]	Dec. 31, 2011 Opportunity Funds [Member] Mervyns II [Member] KLA A Markets LLC [Member] Operating Partnership, as General Partner or Managing Member [Member]	Dec. 31, 2011 Opportunity Funds [Member] Fund II [Member] KA-Shopko LLC [Member]	Dec. 31, 2011 Opportunity Funds [Member] Fund II [Member] KA-Shopko LLC [Member] Operating Partnership, as General Partner or Managing Member [Member]	Dec. 31, 2011 Opportunity Funds [Member] Fund II [Member] KA Marsh LLC [Member]	Dec. 31, 2011 Opportunity Funds [Member] Fund II [Member] Add-On Investments [Member]	Dec. 31, 2011 Opportunity Funds [Member] Fund II [Member] Marsh and Add-On Investments [Member]	Dec. 31, 2011 Opportunity Funds [Member] Fund II [Member] Marsh and Add-On Investments [Member] Operating Partnership, as General Partner or Managing Member [Member]	Jun. 29, 2010 Opportunity Funds [Member] Fund II [Member] CityPoint [Member]	Mar. 25, 2010 Opportunity Funds [Member] Fund I [Member] Sterling Heights Shopping Center [Member]	Dec. 31, 2009 Opportunity Funds [Member] Fund I [Member] Sterling Heights Shopping Center [Member]	Dec. 31, 2011 Opportunity Funds [Member] Fund I [Member] Sterling Heights Shopping Center [Member]	Jun. 30, 2010 Opportunity Funds [Member] Fund III [Member] locations
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage																																			22.20%	49.00%	50.00%																																50.00%	50.00%
Square Footage of Real Estate Property (in feet)																																			1,000,000	311,000
Reclassification of Notes Receivable to Investments in and Advances to Unconsolidated Affiliates																																					$ 8,000,000
Number of Properties Collateralized	29								29																												5
Number of Stores																																															262
Equity Method Investments																																														23,200,000	26,058,000	4,901,000							20,717,000		20,717,000	20,700,000	4,239,000
Payments to Acquire Equity Method Investments									54,981,000	19,116,000	5,603,000																																			2,900,000
Equity Method Investment, Dividends or Distributions																																															45,966,000	11,251,000							4,500,000	11,400,000	81,594,000		16,318,000
Cost Method Investments																																											6,517,000	6,517,000	1,046,000				2,416,000	2,416,000	388,000	2,701,000	2,700,000	535,000						1,108,000	222,000	700,000	2,000,000	2,667,000	533,000
Investment Income, Dividend																																									137,935,000	29,752,000	1,900,000	3,558,000	819,000				500,000	1,679,000	336,000	840,000		168,000						1,659,000	332,000			2,639,000	528,000
Number of Retail Properties																																																					87
Noncontrolling Interest, Ownership Percentage by Parent																		10.50%	20.00%	20.00%	20.00%	13.30%	10.50%	18.90%	5.80%	5.80%	6.00%	13.30%	5.70%	2.00%	3.30%
Equity Method Investment, Net Sales Proceeds																																																																			2,300,000
Gains (Losses) on Recourse Debt																																																																			600,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage																																																																		24.75%
Number of Locations Owned																																																																						14
Combined and Condensed Balance Sheets [Abstract]
Rental property, net												280,470,000	186,802,000
Investments in and advances to unconsolidated affiliates	84,568,000				31,036,000				84,568,000	31,036,000		156,421,000	192,002,000																												62,184,000	11,864,000
Other assets												29,587,000	27,841,000
Total assets	1,653,319,000				1,524,806,000				1,653,319,000	1,524,806,000	1,382,464,000	466,478,000	406,645,000																			633,345,000	574,497,000	558,240,000				901,758,000	772,715,000	607,706,000
Mortgage notes payable												319,425,000	267,565,000
Other liabilities	20,437,000				20,279,000				20,437,000	20,279,000		16,902,000	13,815,000
Partners' equity												130,151,000	125,265,000
Total liabilities and partners' equity	1,653,319,000				1,524,806,000				1,653,319,000	1,524,806,000		466,478,000	406,645,000
Company's share of distributions in excess of share of income and investments in unconsolidated affiliates	(21,710,000)				(20,884,000)				(21,710,000)	(20,884,000)
Combined and Condensed Statements of Operations [Abstract]
Total revenues	38,213,000	36,656,000	37,845,000	37,447,000	36,044,000	36,302,000	33,997,000	34,702,000	150,161,000	141,045,000	134,445,000	42,185,000	29,460,000	30,835,000																		57,994,000	57,084,000	64,249,000				55,888,000	42,062,000	37,375,000
Operating and other expenses									104,129,000	95,506,000	97,830,000	15,924,000	10,617,000	9,851,000
Interest expense												17,099,000	13,525,000	13,786,000
Equity in earnings (losses) of unconsolidated affiliates									1,555,000	10,971,000	(1,529,000)	7,243,000	56,482,000	(30,568,000)	1,555,000	10,971,000	(5,297,000)
Depreciation and amortization									32,986,000	28,808,000	27,612,000	8,837,000	4,839,000	5,152,000																		14,206,000	13,798,000	14,595,000				15,454,000	10,898,000	10,480,000
Loss on sale of property, net												0	(2,957,000)	(390,000)
Net income (loss)									11,548,000	47,335,000	1,844,000	7,568,000	54,004,000	(28,912,000)
Equity Method Investment, Summarized Financial Information, Gross Profit (Loss)															1,946,000	11,363,000	(1,141,000)
Impairment loss									0	0	(3,768,000)				0	0	(3,768,000)																																																			(3,800,000)
Amortization of excess investment															$ (391,000)	$ (392,000)	$ (388,000)