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Real Estate Disposition Activities (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 USD ($) community item | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) community land_parcel home item | Sep. 30, 2014 USD ($) | Dec. 31, 2008 USD ($)
Summary of income from discontinued operations |  |  |  |  |
Number of Apartment Communities Sold | community |  |  | 2 |  |
Number of Land Parcels Sold | land_parcel |  |  | 2 |  |
Proceeds from Sale of Real Estate |  |  | $ 232,415 | $ 186,651 |
Gain on sale of communities |  |  | 146,745 | 229,200 |
Gain on sale of real estate | $ 0 | $ 0 | 9,647 | 0 |
Impairment of Real Estate | $ 658 | $ 0 | $ (10,668) | $ 0 |
Number Of Communities Held For Sale | community | 0 |  | 0 |  |
Avalon Lyndhurst [Member] |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |
Apartment homes | home |  |  | 328 |  |
Proceeds from Sale of Real Estate |  |  | $ 99,000 |  |
Gain on sale of communities |  |  | 35,216 |  |
Other Real Estate Sales [Member] |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |
Proceeds from Sale of Real Estate |  |  | 23,820 |  |
Gain on sale of real estate |  |  | $ 9,626 |  |
Avalon on Stamford Harbor [Member] |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |
Apartment homes | home |  |  | 323 |  |
Number of Boat Slips in Marina Communities | item | 74 |  | 74 |  |
Proceeds from Sale of Real Estate |  |  | $ 115,500 |  |
Gain on sale of communities |  |  | 70,936 |  |
Other Real Estate Sales [Member] |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |
Impairment of Real Estate |  |  |  |  | $ (5,933)
Avalon Mills [Member] |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |
Impairment of Real Estate |  |  | $ 800 |  |

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- Definition Represents the number of boat slips in marina communities. + References No definition available. + Details
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- Definition Number Of Communities Held For Sale + References No definition available. + Details
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- Definition Number of Operating Apartment Communities Sold + References No definition available. + Details
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- Definition Amount of gain (loss) on sale or disposal of other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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