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Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Land	$ 1,833,156	$ 1,790,281
Under development:
Real estate under development (net of accumulated depreciation of $0)	124,072	177,632
Real estate owned	9,190,276	8,383,259
Real Estate Investment Property, Accumulated Depreciation	2,646,044	2,434,772
Accumulated depreciation	(2,646,874)	(2,434,772)	$ (2,208,794)	$ (1,924,682)
Total real estate owned, net of accumulated depreciation	6,543,402	5,948,487
Land
Held for sale:
Sold or held for sale	9,963	0
Under development:
Real estate under development (net of accumulated depreciation of $0)	78,085	24,584
Building and improvements
Held for sale:
Sold or held for sale	2,642	0
Construction in progress
Under development:
Real estate under development (net of accumulated depreciation of $0)	45,987	153,048
United Dominion Reality L.P.
Property, Plant and Equipment [Line Items]
Land	833,300	1,008,014
Depreciable property - held and used:
Building and improvements	2,797,605	3,230,756
Under development:
Real estate owned	3,630,905	4,238,770
Real Estate Investment Property, Accumulated Depreciation	1,281,258	1,403,303
Accumulated depreciation	(1,281,258)	(1,403,303)	$ (1,241,574)	$ (1,097,133)
Total real estate owned, net of accumulated depreciation	$ 2,349,647	$ 2,835,467

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Real Estate Owned Gross.

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Real Estate Under Development.

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The current amount of expenditures for a real estate project that has not yet been completed.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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-SubTopic 360
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