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Acquisitions - Summary of Acquired Shopping Centers (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Oakland, CA [Member]
Business Acquisition Gross Purchase Price And Mortgage Debt Assumed [Line Items]
Acquisition date of shopping centers	February 2013
Gross Purchase Price	$ 41.1
Face Value of Mortgage Debt Assumed
Highland Village, TX [Member]
Business Acquisition Gross Purchase Price And Mortgage Debt Assumed [Line Items]
Acquisition date of shopping centers	March 2013
Gross Purchase Price	40.3
Face Value of Mortgage Debt Assumed

The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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