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Investments In Joint Ventures (Narrative) (Details) (USD $) | 0 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Nov. 02, 2012 acre | Oct. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2012 acre | Jun. 30, 2012 acre | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Number of joint ventures accounted for under equity method investments |  |  |  |  |  |  |  |  | 5 |
Equity method investment ownership percentage |  |  | 20.00% | 25.00% |  |  | 20.00% |  | 25.00% |
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 |  |  |  | 2,800,000 |  |  |  | 2,400,000 | 8,800,000 | 6,400,000
Acres of land acquired | 2.4 |  |  | 12.0 | 4.7 |  |  |  |  |
Number of operating properties sold |  |  | 2 | 1 |  | 3 | 4 |  |  |
Number of apartment homes in operating properties sold |  | 473 | 788 | 253 |  | 1,033 |  |  |  |
Sales price of property sold by unconsolidated joint venture |  |  |  | 54,400,000 |  |  |  |  |  |
Gain on sale of property by unconsolidated joint venture |  |  |  | 2,900,000 |  |  |  |  |  |
Kansas City Missouri [Member] |  |  |  |  |  |  |  |  |  |
Number of operating properties sold |  | 1 |  |  |  |  |  |  |  |
Number of apartment homes in operating properties sold |  | 596 |  |  |  |  |  |  |  |
Sales price of property sold by unconsolidated joint venture |  | $ 40,700,000 |  |  |  |  |  |  |  |
Raleigh North Carolina [Member] |  |  |  |  |  |  |  |  |  |
Number of units in multifamily properties acquired |  |  |  |  |  | 350 |  |  |  |
Orange County Florida [Member] |  |  |  |  |  |  |  |  |  |
Acres of land acquired |  |  |  |  |  | 15.0 |  |  |  |
Charlotte North Carolina [Member] |  |  |  |  |  |  |  |  |  |
Acres of land acquired |  |  |  | 3.7 |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Equity method investment ownership percentage |  |  |  | 15.00% |  |  |  |  | 15.00% |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Equity method investment ownership percentage |  |  |  | 50.00% |  |  |  |  | 50.00% |

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