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Real Estate Disposition Activities (Details) $ in Thousands	1 Months Ended		12 Months Ended
	Apr. 30, 2015 USD ($)	Jun. 30, 2014 USD ($) community	Dec. 31, 2015 USD ($) community home land_parcel	Dec. 31, 2014 USD ($) home	Dec. 31, 2013 USD ($) home
Summary of income from discontinued operations
Number of apartment communities sold | community		8
Apartment homes | home				1,337	3,299
Gain on sale of communities			$ 115,625	$ 84,925	$ 0
Number of Land Parcels Sold | land_parcel			2
Gain on sale of real estate			$ 9,647	490	240
Income tax expense			1,861	9,368	0
Repayments of secured mortgages			0	16,341	0
Gross sales price			289,320	304,250	932,880
Net proceeds			$ 282,163	$ 281,125	919,442
Number of communities held for sale | home			1
Avalon on Stamford Harbor
Summary of income from discontinued operations
Apartment homes | home			323
Gross sales price			$ 115,500
Net proceeds			112,504
Other real estate dispositions (1)
Summary of income from discontinued operations
Gain on sale of real estate			9,647
Gross sales price			23,820
Net proceeds			$ 23,337
Avalon Lyndhurst [Member]
Summary of income from discontinued operations
Apartment homes | home			328
Gross sales price			$ 99,000
Net proceeds			$ 96,574
Avalon Charles Pond [Member]
Summary of income from discontinued operations
Apartment homes | home			200
Gross sales price			$ 51,000
Net proceeds			$ 49,748
Avalon Hingham MA and Brooklyn NY
Summary of income from discontinued operations
Net proceeds					$ 1,313
Mortgage notes payable
Summary of income from discontinued operations
Repayments of secured mortgages		$ 5,914
Mortgage notes payable | Notes payable maturing in 2015
Summary of income from discontinued operations
Repayments of secured mortgages	$ 481,582	$ 10,427
Wholly Owned Properties
Summary of income from discontinued operations
Number of apartment communities sold | community			3
Apartment homes | home			851
Sale of Communities Gross Sales Price			$ 265,500
Gain on sale of communities			$ 115,625

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-Topic 230
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