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Investments in Joint Ventures (Narrative) (Details) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 30, 2011 | Mar. 31, 2011 | Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010
Number of joint ventures accounted for under equity method investments |  |  | 17 |  | 17 |
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 |  |  | 2,471,000 | 2,045,000 | 4,309,000 | 3,883,000
Proceeds from sale of ownership interests in three unconsolidated joint venture communities |  | 19,300,000 |  |  |  |
Gain on sale of unconsolidated joint venture interests |  | 1,100,000 |  |  | 1,136,000 |
Proceeds from sale of property | 9,400,000 |  |  |  |  |
Gain on sale of properties | 4,700,000 |  |  |  |  |
Houston Texas [Member] |  |  |  |  |  |
Number of units in multifamily property |  |  | 1,358 |  | 1,358 |
Atlanta Georgia [Member] |  |  |  |  |  |
Number of units in multifamily property |  |  | 234 |  | 234 |
Tampa Florida [Member] |  |  |  |  |  |
Number of units in multifamily property |  |  | 450 |  | 450 |
Austin Texas [Member] |  |  |  |  |  |
Number of units in multifamily property |  |  | 768 |  | 768 |
San Antonio Texas [Member] |  |  |  |  |  |
Number of units in multifamily property |  |  | 288 |  | 288 |
Dallas Texas [Member] |  |  |  |  |  |
Number of units in multifamily property |  |  | 1,250 |  | 1,250 |
Minimum [Member] |  |  |  |  |  |
Equity method investment ownership percentage |  |  | 15.00% |  | 15.00% |
Maximum [Member] |  |  |  |  |  |
Equity method investment ownership percentage |  |  | 50.00% |  | 50.00% |
Unconsolidated Joint Venture 1 [Member] |  |  |  |  |  |
Fees earned for property and asset management, construction, development, and other services to joint ventures |  |  | $ 2,400,000 | $ 1,600,000 | $ 3,900,000 | $ 3,100,000

X
- Definition Revenue, comprised of based and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations excluding third party construction fees. + Details
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- Definition Number of apartment units in Property acquired + Details
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- Definition Number of joint ventures accounted for under equity method investments. + Details
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- Definition This item represents the amount of net sales proceeds received on disposal of an equity method investment. + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) + Details
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- Definition This item represents the amount of gain or loss arising from the disposal of an equity method investment. + Details
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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 + Details
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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 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph c + Details
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