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Real Estate Disposition Activities (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) community	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) community home land_parcel	Sep. 30, 2018 USD ($)
Summary of income from discontinued operations
Gain on sale of communities	$ 130,484,000	$ 27,243,000	$ 165,849,000	$ 132,444,000
Number Of Land Parcels Sold | land_parcel			2
Number Of Communities Held for Sale | community	0		0
Oakwood Arlington [Member]
Summary of income from discontinued operations
Number Of Apartment Homes Sold | home			184
Proceeds from Sale of Real Estate			$ 70,000,000
Gain on sale of communities			16,382,000
Land Parcel [Member]
Summary of income from discontinued operations
Proceeds from Sale of Real Estate			3,680,000
Gain on sale of communities			$ 164,000
Archstone Toscano [Member]
Summary of income from discontinued operations
Number Of Apartment Homes Sold | home			474
Proceeds from Sale of Real Estate			$ 98,000,000
Gain on sale of communities			$ 20,604,000
AVA Stamford [Member]
Summary of income from discontinued operations
Number Of Apartment Homes Sold | home			306
Proceeds from Sale of Real Estate			$ 105,000,000
Gain on sale of communities			$ 62,496,000
Archstone Lexington [Member]
Summary of income from discontinued operations
Number Of Apartment Homes Sold | home			222
Proceeds from Sale of Real Estate			$ 45,100,000
Gain on sale of communities			$ 20,286,000
Memorial Heights Villages [Member]
Summary of income from discontinued operations
Number Of Apartment Homes Sold | home			318
Proceeds from Sale of Real Estate			$ 65,250,000
Gain on sale of communities			$ 15,328,000
Avalon Orchards [Member]
Summary of income from discontinued operations
Number Of Apartment Homes Sold | home			156
Proceeds from Sale of Real Estate			$ 44,250,000
Gain on sale of communities			$ 32,289,000

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-URI http://asc.fasb.org/extlink&oid=117337411&loc=d3e23528-158515

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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Cash received for the sale of real estate that is not part of an investing activity during the current period.

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