Real Estate Acquisitions and Dispositions (Details) (USD $)	12 Months Ended			0 Months Ended					12 Months Ended	0 Months Ended					0 Months Ended		3 Months Ended	12 Months Ended		3 Months Ended					12 Months Ended						12 Months Ended			0 Months Ended			12 Months Ended		0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	May 21, 2012 Klepierre	Mar. 14, 2012 Klepierre	Jan. 06, 2012 Del Amo Fashion Center	Aug. 08, 2013 Office property, Boston, Massachusetts	May 03, 2012 The Domain, Austin, TX property	Dec. 31, 2011 Sale of Consolidated Properties	Jan. 10, 2014 Portfolio of ten properties property Item	May 30, 2013 Outlet center, Portland OR sqft	Dec. 04, 2012 Grand Prairie and Livermore properties	Dec. 04, 2012 Livermore Premium Outlets, Livermore (San Francisco), CA	Dec. 04, 2012 Grand Prairie Premium Outlets, Grand Prairie (Dallas), TX	Jun. 04, 2012 Outlet center, Destin, FL sqft	Mar. 22, 2012 TMLP 2012 acquisition	Dec. 31, 2011 Dissolved Joint Venture Partnership	Dec. 31, 2011 Dissolved Joint Venture Partnership property	Sep. 30, 2012 Dissolved Joint Venture Partnership	Sep. 30, 2012 Dissolved Joint Venture Partnership Maximum	Sep. 30, 2011 King of Prussia	Jan. 10, 2014 King of Prussia	Aug. 25, 2011 King of Prussia	Jul. 19, 2011 Albuquerque, New Mexico lifestyle center	Dec. 31, 2012 Retail properties	Dec. 31, 2013 Outlet center property	Dec. 31, 2013 Real estate property interests property	Mar. 22, 2012 Real estate property interests TMLP 2012 acquisition property	Sep. 30, 2011 Unconsolidated properties property	Mar. 22, 2012 Unconsolidated properties TMLP 2012 acquisition property	Dec. 31, 2013 Unconsolidated properties Community Centers property	Dec. 31, 2013 Unconsolidated properties Retail properties property	Dec. 31, 2012 Unconsolidated properties Retail properties property	Dec. 04, 2012 Consolidated properties property	Jan. 10, 2014 Consolidated properties Portfolio of ten properties property	Mar. 22, 2012 Consolidated properties TMLP 2012 acquisition property	Dec. 31, 2013 Consolidated properties Retail properties property	Dec. 31, 2012 Consolidated properties Retail properties property	Dec. 04, 2012 Consolidated properties Outlet center Grand Prairie and Livermore properties property
Real Estate Acquisitions and Dispositions
Number of properties in which interest is acquired										10																5					3			2	7				2
Consideration paid										$ 113,300,000		$ 260,900,000
Consideration paid in cash, percentage												90.00%
Consideration paid by issuance of units, percentage												10.00%
Property interest acquired (as a percent)											100.00%				50.00%
Area of property acquired (in square feet)											390,000				465,000
Property interest acquired											146,700,000				70,500,000
Gain on acquisition of property interests											27,300,000
Ownership interests acquired (as a percent)													50.00%	50.00%									83.75%	100.00%										50.00%
Ownership interest after acquisition (as a percent)													100.00%	100.00%			100.00%	100.00%				100.00%	96.10%
Construction loans extinguished upon acquisition												162,500,000
Number of properties																											18	26	9	16						9
Transaction value																1,500,000,000
Joint venture ownership percentage					28.70%												50.00%	50.00%
Purchase price of equity method investment acquired					2,000,000,000	50,000,000
Joint venture ownership percentage						25.00%
Joint venture ownership percentage after transactions				28.90%		50.00%
Number of consolidated properties received in distribution																		6
Gain due to acquisition of controlling interest																	168,300,000				82,900,000															488,700,000
Investment properties																			585,000,000
Lease related intangibles																			59,100,000
Mortgage debt including debt premiums																2,600,000,000			468,800,000				160,100,000
Estimated life of investment property																				40 years
Number of properties disposed of during the period																															3	3	4				8	9
Gain (loss) on disposition							7,900,000	12,400,000	(42,400,000)																15,500,000		80,200,000
Number of properties sold								2
Aggregate carrying value of consolidated properties disposed of									355,400,000
Debt obligation related to consolidated properties disposed of									177,000,000
Net proceeds from sale of assets	$ 274,058,000	$ 383,804,000	$ 136,013,000						$ 136,000,000
Number of partner's interest acquired										1