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Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Summary of carrying amounts for real estate owned (at cost)
Land	$ 1,955,007	$ 1,847,127
Under development:
Under development	321,094	466,002
Real estate owned	8,428,291	8,207,977
Accumulated depreciation	(2,379,033)	(2,208,794)
Real estate owned, net	6,049,258	5,999,183
Land [Member]
Under development:
Under development	47,038	110,769
Construction in progress [Member]
Under development:
Under development	274,569	356,644
United Dominion Reality L.P. [Member]
Summary of carrying amounts for real estate owned (at cost)
Land	998,797	1,004,447
Depreciable property - held and used:
Building, improvements, and furniture, fixture and equipment	3,100,598	3,103,970
Under development:
Under development	119,315	80,063
Real estate owned	4,219,223	4,188,480
Accumulated depreciation	(1,358,123)	(1,241,574)
Real estate owned, net	2,861,100	2,946,906
United Dominion Reality L.P. [Member] | Land [Member]
Under development:
Under development	9,447	9,447
United Dominion Reality L.P. [Member] | Construction in progress [Member]
Under development:
Under development	$ 110,381	$ 70,616

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The net book value of real estate held for investment and real estate under development.

+ References

No definition available.

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Real Estate Owned Gross.

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.10)

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Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(d))

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- Definition

Amount before accumulated deprecation and depletion of real estate held for productive use and additions or improvements to real estate held for productive use, examples include, but are not limited to, walkways, driveways, fences, and parking lots. Excludes land held for sale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

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-Publisher FASB

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12



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