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Investments In Joint Ventures (Narrative) (Details) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2012 | Jun. 30, 2011 | Apr. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2011 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Number of joint ventures accounted for under equity method investments |  |  |  |  |  | 17 |  |
Equity method investment ownership percentage |  |  |  |  | 20.00% | 20.00% |  |
Fees earned for property and asset management, construction, development, and other services to joint ventures |  |  |  |  |  | $ 9,300,000 | $ 6,200,000 | $ 6,800,000
Fees earned on third-party construction projects |  |  |  |  |  | 700,000 | 2,000,000 | 1,200,000
Number of joint ventures sold |  |  |  | 3 |  |  |  |
Number of operating properties sold | 1 |  |  |  | 4 |  |  |
Proceeds from sale of unconsolidated joint ventures |  |  |  | 19,300,000 |  |  |  |
Gain on sale of unconsolidated joint venture interests |  |  |  | 1,100,000 |  | 1,136,000 |  |
Number of development properties sold |  | 1 | 1 |  |  |  |  |
Number of multifamily properties acquired | 1 |  |  |  |  | 18 |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  | 80.00% | 80.00% |  |
Mortgage debt assumed |  |  |  |  |  |  | 188,119,000 |
Houston, Texas [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Number of units in multifamily properties acquired |  |  |  |  |  | 2,846 |  |
Atlanta, Georgia [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Number of units in multifamily properties acquired |  |  |  |  |  | 234 |  |
Tampa, Florida [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Number of units in multifamily properties acquired |  |  |  |  |  | 450 |  |
Austin, Texas [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Number of units in multifamily properties acquired |  |  |  |  |  | 768 |  |
Proceeds from sale of property |  | 3,100,000 |  |  |  |  |  |
Gain on sale of properties |  | 100,000 |  |  |  |  |  |
San Antonio, Texas [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Number of units in multifamily properties acquired |  |  |  |  |  | 528 |  |
Dallas, Texas [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Number of units in multifamily properties acquired |  |  |  |  |  | 1,250 |  |
Washington, D.C. [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Equity method investment ownership percentage |  |  | 20.00% |  |  |  |  |
Proceeds from sale of development property with reimbursement |  |  | 9,400,000 |  |  |  |  |
Gain on sale of properties |  |  | 4,700,000 |  |  |  |  |
Louisville, Kentucky [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Gain on sale of unconsolidated joint venture interests |  |  |  |  | 6,400,000 |  |  |
Number of apartment units in property disposed |  |  |  |  | 1,194 |  |  |
Dallas, Houston, Las Vegas, Phoenix, and Southern California [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 80.00% |  |  |  |  |  |  |
Number of unconsolidated equity method investments acquired | 12 |  |  |  |  |  |  |
Purchase remaining interest | 99,500,000 |  |  |  |  |  |  |
Repayments of Assumed Debt | 272,600,000 |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Equity method investment ownership percentage |  |  |  |  | 15.00% | 15.00% |  |
Maximum [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Equity method investment ownership percentage |  |  |  |  | 50.00% | 50.00% |  |
Acquisition [Member] | Raleigh, North Carolina [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Number of units in multifamily properties acquired | 350 |  |  |  |  |  |  |
Acquisition [Member] | Dallas, Houston, Las Vegas, Phoenix, and Southern California [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Number of apartment units in wholly owned property acquired | 4,034 |  |  |  |  |  |  |

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- Definition Number of apartment units in properties acquired during the period by our discretionary funds (unconsolidated joint ventures). + References No definition available. + Details
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- Definition Amount of cash paid to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -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 Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph f(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. + Details
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- Definition Percentage of voting equity interests acquired in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph c -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 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1392-128463 + Details
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- Definition The aggregate revenue from building and real estate development, which may include improvements (such as drainage, utilities, grading and subdividing) to a parcel of land, and general contracting services during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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