Number of Apartment Homes Acquired

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Number of Apartment Homes Held for Sale

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Number of Apartment Homes Sold

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Number of Communities Acquired

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Number of Communities Held for Sale

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Number of Communities Sold

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Number of Phases in a Community Sold

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Number of Sold Phases in a Community Sold

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Retail Square Feet Held for Sale

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The cash outflow associated with the purchase of other real estate investments held by the entity for investment purposes not otherwise defined in the taxonomy.

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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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Amount of real estate investments, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; (7) other real estate investments; (8) real estate joint ventures; and (9) unconsolidated real estate and other joint ventures not separately presented.

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The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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Subsequent Events (Details) ft² in Thousands	1 Months Ended					9 Months Ended
Subsequent Events (Details) ft² in Thousands	Nov. 02, 2018 USD ($) community home phase ft²	Oct. 31, 2018 USD ($) home	Aug. 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Feb. 28, 2018 USD ($)	Sep. 30, 2018 USD ($) community	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Subsequent Event [Line Items]
Number of communities held for sale \| community						3
Real Estate Investments, Net						$ 17,930,213,000		$ 17,717,557,000
Credit Facility						56,000,000		0
Payments to Acquire Other Real Estate						84,088,000	$ 228,011,000
Line of Credit [Member]
Subsequent Event [Line Items]
Credit Facility						$ 56,000,000		$ 0
Line of Credit [Member] \| Subsequent Event
Subsequent Event [Line Items]
Credit Facility	$ 175,000,000
Secured notes \| Notes Payable Maturities 2018
Subsequent Event [Line Items]
Repayments of secured mortgages			$ 51,449,000	$ 13,380,000	$ 11,038,000
Avalon at Fairway Hills [Member] \| Subsequent Event
Subsequent Event [Line Items]
Number of Phases in a Community Sold \| phase	3
Subsequent Event Acquisitions [Member] \| Subsequent Event
Subsequent Event [Line Items]
Number of Communities Acquired \| community	2
Number of Apartment Homes Acquired \| home	546
Payments to Acquire Other Real Estate	$ 178,400,000
NYC JV [Member] \| Subsequent Event
Subsequent Event [Line Items]
Equity Method Investment, Ownership Percentage	20.00%
Avalon at Fairway Hills - Fields [Member] \| Subsequent Event
Subsequent Event [Line Items]
Number of Sold Phases in a Community Sold \| phase	1
NY Joint Venture [Member] \| Subsequent Event
Subsequent Event [Line Items]
Number of communities held for sale \| community	5
Number of Apartment Homes Held for Sale \| home	1,301
Retail Square Feet Held for Sale \| ft²	58
Real Estate Investments, Net	$ 516,214,000
Avalon Woodland Park [Member] \| AC JV [Member] \| Subsequent Event
Subsequent Event [Line Items]
Number of Apartment Homes Sold \| home		392
Proceeds from sale of real estate		$ 94,250,000
Subsequent Event Dispositions [Member] \| Subsequent Event
Subsequent Event [Line Items]
Number of Communities Sold \| community	3
Number of Apartment Homes Sold \| home	468
Proceeds from sale of real estate	$ 142,650,000