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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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