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Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition, Pro Forma Net Income (Loss)	$ 319,385	$ 105,875
United Dominion Reality L.P.
Business Acquisition Pro Forma Net Income (Loss) from Equity Method Investments	(12,006)	(26,511)
Business Acquisition, Pro Forma Net Income (Loss)	$ 205,954	$ 69,716

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- Definition

Business Acquisition Pro Forma Net Income (Loss) from Equity Method Investments

+ References

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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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