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Real Estate Disposition Activities (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) community	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) community home land_parcel	Jun. 30, 2018 USD ($)
Summary of income from discontinued operations
Gain on sale of communities	$ 20,530,000	$ 105,201,000	$ 35,365,000	$ 105,201,000
Number of Land Parcels Sold | land_parcel			2
Number of Communities Held for Sale | community	1		1
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			$ 214,000
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

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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
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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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