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Transactions with Related Parties - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012 Director	Dec. 31, 2011	Dec. 31, 2010 ShoppingCenter	Dec. 31, 2013 ECE joint venture [Member] Directors	Dec. 31, 2007 ECE joint venture [Member]
Related Party Transaction [Line Items]
Joint venture ownership percentage					75.00%
Joint venture ownership percentage					25.00%
Number of directors				2
Mezzanine loan			$ 31.7
Number of shopping centers			6
Related transactions, interest rate			10.00%
Number of Board of directors positions retained	2
Interest income	$ 1.5	$ 3.2

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

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-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864



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