Subsequent Events (Narrative) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012 Room	Jul. 31, 2012 Post South End [Member] sqft Property
Subsequent Event [Line Items]
Number of units acquired	21,622	360
Square feet of retail space acquired		7,612
Purchase price of acquired apartment community		$ 74,000
Remaining capacity borrowed under existing term loan	$ 70,000

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant