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Real Estate Disposition Activities (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) community | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) community land_parcel home | Sep. 30, 2016 USD ($)
Summary of income from discontinued operations |  |  |  |
Number of land parcels sold | land_parcel |  |  | 2 |
Number of owned communities under construction | community | 23 |  | 23 |
(Loss) gain on sale of other real estate | $ (120) | $ 10,778 | $ 246 | $ 10,921
Gain on sale of communities | $ 27,738 | $ 202,163 | $ 159,754 | $ 284,582
Number of communities held for sale | community | 1 |  | 1 |
Avalon Pines |  |  |  |
Summary of income from discontinued operations |  |  |  |
Proceeds from sale of real estate |  |  | $ 140,000 |
Number of apartment homes sold | home |  |  | 450 |
Gain on sale of communities |  |  | $ 87,949 |
Other Real Estate Sales |  |  |  |
Summary of income from discontinued operations |  |  |  |
(Loss) gain on sale of other real estate |  |  | 366 |
Proceeds from sale of real estate |  |  | 22,286 |
AVA University District |  |  |  |
Summary of income from discontinued operations |  |  |  |
Proceeds from sale of real estate |  |  | $ 112,500 |
Number of apartment homes sold | home |  |  | 283 |
Gain on sale of communities |  |  | $ 42,596 |
Undeveloped Land [Member] |  |  |  |
Summary of income from discontinued operations |  |  |  |
Proceeds from sale of real estate |  |  | 15,500 |
Gain on sale of communities |  |  | (120) |
Avalon Danbury |  |  |  |
Summary of income from discontinued operations |  |  |  |
Proceeds from sale of real estate |  |  | $ 52,000 |
Number of apartment homes sold | home |  |  | 234 |
Gain on sale of communities |  |  | $ 27,829 |
Development Communities | Avalon Newcastle Commons I |  |  |  |
Summary of income from discontinued operations |  |  |  |
Number of owned communities under construction | community | 1 |  | 1 |

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