Subsequent Events (Details) (Subsequent event, Archstone Memorial Heights [Member], USD $) In Thousands, unless otherwise specified	1 Months Ended
Oct. 31, 2014 home
Subsequent event \| Archstone Memorial Heights [Member]
Subsequent events
Number of apartment homes sold	556
Proceeds from sale of real estate	$ 105,500

Cash received for the sale of real estate that is not part of an investing activity during the current period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

Name:	us-gaap_ProceedsFromSaleOfRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration