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Property Acquisitions, Discontinued Operations, And Assets Held For Sale (Narrative) (Details) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Apr. 30, 2013 | Mar. 31, 2013 acre | Mar. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2012
Property Acquisitions, Discontinued Operations, And Assets Held For Sale [Abstract] |  |  |  |  |
Number of operating properties acquired | 1 |  |  |  |
Number of apartment units in wholly owned property acquired | 356 |  |  |  |
Purchase price of operating properties acquired | $ 108,500,000 |  |  |  |
Number of operating properties sold |  | 1 |  | 7 | 11
Number of apartment homes in operating properties sold | 526 | 770 |  |  | 3,213
Number of assets classified as held for sale |  | 1 |  |  |
Sales price of assets held for sale sold subsequent to the period end | 40,500,000 |  |  |  |
Acres of land |  | 3.7 |  |  |
Sales price of land parcels |  | 6,600,000 |  |  |
Gain on sale of land |  | $ 698,000 | $ 0 |  |

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- Definition Number of apartment units in property disposed of or held for sale 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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Data Type: | xbrli:integerItemType
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- Definition Number of assets classified as held for sale. + References No definition available. + Details
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- Definition Number of operating properties acquired which are now fully consolidated during the period. + References No definition available. + Details
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- Definition Number of operating properties sold during the period. + References No definition available. + Details
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- Details
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- Definition Sales price of property or properties purchased during the period. + References No definition available. + Details
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- Definition Area of land held. + References No definition available. + Details
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Balance Type: | na
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- Definition The difference between the sale price or salvage price and the book value of a property, plant, and equipment asset that was sold or retired during the reporting period. This element refers to the gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition The cash inflow from the sale of land held for investment; excludes sales of land held as inventory or productive use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -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 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -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 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 + Details
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