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Investments In Joint Ventures (Narrative) (Details) (USD $) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  | 1 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended
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Nov. 04, 2011 | Mar. 31, 2011 | Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 Minimum [Member] | Sep. 30, 2011 Maximum [Member] | Nov. 04, 2011 Houston Texas [Member] | Sep. 30, 2011 Houston Texas [Member] | Sep. 30, 2011 Atlanta Georgia [Member] | Sep. 30, 2011 Tampa Florida [Member] | Jun. 30, 2011 Austin Texas [Member] | Sep. 30, 2011 Austin Texas [Member] | Sep. 30, 2011 San Antonio Texas [Member] | Sep. 30, 2011 Dallas Texas [Member] | Apr. 30, 2011 Washington, D.C. [Member]
Number of joint ventures accounted for under equity method investments |  |  | 17 |  | 17 |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment ownership percentage |  |  |  |  |  |  | 15.00% | 50.00% |  |  |  |  |  |  |  |  | 20.00%
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 |  |  | 2,400,000 | 1,600,000 | 6,400,000 | 4,700,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of ownership interests in three unconsolidated joint venture communities |  | 19,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of unconsolidated joint venture interests |  |  |  |  | (1,136,000) |  |  |  |  |  |  |  |  |  |  |  |
Number of multifamily properties acquired by our discretionary funds | 5 |  |  |  | 13 |  |  |  |  |  |  |  |  |  |  |  |
Number of units in multifamily properties acquired |  |  |  |  |  |  |  |  | 1,488 | 1,358 | 234 | 450 |  | 768 | 528 | 1,250 |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  |  |  | 3,100,000 |  |  |  |
Proceeds from sale of development property with reimbursement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,400,000
Gain on sale of properties |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  | $ 4,700,000

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