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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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Number of Land Parcels Held For Sale

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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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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

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