Cash received for the sale of real estate that is not part of an investing activity during the current period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

Name:	us-gaap_ProceedsFromSaleOfRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Real Estate Activities - Dispositions of Assets for Discontinued Operations (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended		9 Months Ended
	Sep. 30, 2013 Phillipsburg Mall [Member] 2010 Credit Facility [Member] Mall [Member]	Sep. 30, 2013 Phillipsburg Mall [Member] 2010 Term Loan [Member] Power center [Member]	Sep. 30, 2013 Paxton Towne Centre [Member] Mortgage loans on real estate [Member] Power center [Member]	Sep. 30, 2013 Commons at Magnolia and Christiana Center Combined [Member] Mortgage loans on real estate [Member] Power center [Member]	Sep. 16, 2013 Christiana Center [Member] Mortgage loans on real estate [Member] Power center [Member]
Disposals [Line Items]
Proceeds from the sale of property to repay	$ 11.5		$ 50.0	$ 35.0
Available working capital pay for release		4.5
Debt assumed by buyer					$ 49.2