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Real Estate Disposition Activities (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) community land_parcel | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) community land_parcel home | Sep. 30, 2015 USD ($)
Summary of income from discontinued operations |  |  |  |
Number of Apartment Communities Sold | community |  |  | 5 |
Gain on sale of communities | $ 202,163 | $ 35,216 | $ 284,582 | $ 106,151
Number of Communities Held for Sale | community | 3 |  | 3 |
Number of Land Parcels Held For Sale | land_parcel | 3 |  | 3 |
Eaves Trumbull [Member] |  |  |  |
Summary of income from discontinued operations |  |  |  |
Apartment homes | home |  |  | 340 |
Proceeds from Sale of Real Estate |  |  | $ 70,250 |
Gain on sale of communities |  |  | $ 51,430 |
Avalon Essex [Member] |  |  |  |
Summary of income from discontinued operations |  |  |  |
Apartment homes | home |  |  | 154 |
Proceeds from Sale of Real Estate |  |  | $ 45,100 |
Gain on sale of communities |  |  | $ 31,081 |
Eaves Nanuet [Member] |  |  |  |
Summary of income from discontinued operations |  |  |  |
Apartment homes | home |  |  | 504 |
Proceeds from Sale of Real Estate |  |  | $ 147,000 |
Gain on sale of communities |  |  | $ 118,008 |
Avalon Shrewsbury [Member] |  |  |  |
Summary of income from discontinued operations |  |  |  |
Apartment homes | home |  |  | 251 |
Proceeds from Sale of Real Estate |  |  | $ 60,500 |
Gain on sale of communities |  |  | $ 33,350 |
Avalon at Freehold [Member] |  |  |  |
Summary of income from discontinued operations |  |  |  |
Apartment homes | home |  |  | 296 |
Proceeds from Sale of Real Estate |  |  | $ 68,000 |
Gain on sale of communities |  |  | $ 46,482 |

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- Definition The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Cash received for the sale of real estate that is not part of an investing activity during the current period. + References Reference 1: 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=66902209&loc=d3e3179-108585 + Details
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