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Property Acquisitions, Discontinued Operations, And Assets Held For Sale (Narrative) (Details) (USD $) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2011
Property Acquisitions, Discontinued Operations, And Assets Held For Sale [Abstract] |  |  |  |  |
Percentage of voting interests acquired | 80.00% |  |  |  |
Number of unconsolidated equity method investments acquired | 12 |  | 12 |  |
Number of apartment units in wholly owned property acquired | 4,034 |  |  |  |
Gain on acquisition of controlling interest in joint ventures |  |  | $ 40,191,000 |  | $ 0
Pro Forma Property Revenues of Acquiree since Acquisition Date, Actual |  |  | 8,700,000 |  |
Pro Forma Property Expenses of Acquiree since Acquisition Date, Actual |  |  | $ 3,600,000 |  |
Number of operating properties sold |  | 2 | 3 | 4 |
Number of apartment homes in operating properties sold |  | 788 | 1,033 |  |
Number of assets classified as held for sale |  |  | 0 |  |

X
- Definition This element represents the amount of property expenses of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References No definition available. + Details
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- Definition Number of apartment homes in the operating properties sold during the period. + References No definition available. + Details
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- Definition Total number of apartment units associated with the property or properties acquired during the period. + References No definition available. + Details
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- Definition Number of unconsolidated equity method investments acquired during the period. + References No definition available. + 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of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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