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Investments In Joint Ventures (Narrative) (Details) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended			3 Months Ended
	Jul. 31, 2012	Jun. 30, 2012 acre	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Mar. 31, 2012 Raleigh North Carolina [Member]	Mar. 31, 2012 Orange County Florida [Member] acre	Jun. 30, 2012 Minimum [Member]	Jun. 30, 2012 Maximum [Member]
Number of joint ventures accounted for under equity method investments				5
Equity method investment ownership percentage						20.00%			15.00%	50.00%
Maximum guaranteed amount of loans utilized for construction and development activities for joint ventures		$ 0		$ 0
Fees earned for property and asset management, construction, development, and other services to joint ventures		$ 3,300,000	$ 2,400,000	$ 6,100,000	$ 3,900,000
Number of units in multifamily properties acquired	223	477					350
Acres of land acquired		4.7						15.0

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- Definition

Acres of land acquired by the company during the period to be utilized in the development of multiple multifamily apartment communities.

+ References

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- Definition

Revenue earned by providing property management, construction, development, and other services to joint ventures.

+ References

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- Definition

Number of apartment units in properties acquired during the period by our discretionary funds (unconsolidated joint ventures).

+ References

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- Definition

Number of joint ventures accounted for under equity method investments.

+ References

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 18

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 20

-Subparagraph a (1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

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

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 13

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

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