Real Estate Acquisitions - Additional Information (Detail)	Sep. 30, 2013
Business Acquisition [Line Items]
Number of Units in Real Estate Property	48,343
Greenwood Forest [Member]
Business Acquisition [Line Items]
Number of Units in Real Estate Property	316
Station Square at Cosner's Corner [Member] [Member]
Business Acquisition [Line Items]
Number of Units in Real Estate Property	260

The number of units in a real estate property owned as of the balance sheet date.

No definition available.

Name:	us-gaap_NumberOfUnitsInRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant