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Represents the equity in income from entities accounted for using the equity method relating to the Company's recognition of its promoted interest.

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Number of Operating Apartment Communities Sold

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Number of Apartment Homes Acquired

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Represents the number of apartment homes in communities owned.

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Number of Apartment Homes Sold

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Number of Communities Acquired

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Number of operating apartment communities owned (or in which a direct or indirect ownership interest is held).

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Percentage of Right of Distribution

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Percentage of Right of Remaining Distribution

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Preferred Interest Obligation Liquidation Value

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Real Estate Investments, Percent of Development Funded by Borrowings

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Retail Square Feet Sold

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Represents the gross sales price of real estate assets sold.

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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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Amount of gain (loss) on sale or disposal of an equity method investment.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

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This element represents the current and noncurrent portions of a long-term real estate loan with an initial maturity beyond one year or beyond the normal operating cycle, if longer, to finance building costs. The funds are disbursed as needed or in accordance with a prearranged plan; generally, a portion of the funds is disbursed at inception and the remainder as construction progresses. The money is repaid on completion of the project (generally one to seven years), usually from the proceeds of a mortgage loan. The rate is normally higher than the prime rate, and there is usually an origination fee. The effective yield on these loans tends to be high, and the lender has a security interest in the real property.

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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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The cash inflow from borrowings to finance the cost of construction.

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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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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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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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Investments in Real Estate Entities (Details)	12 Months Ended
Investments in Real Estate Entities (Details)	Dec. 31, 2020 USD ($) community home ft²	Dec. 31, 2019 USD ($) home community	Dec. 31, 2018 USD ($) community home ft²
Schedule of Equity Method Investments [Line Items]
Preferred interest obligation redemption and dividends	$ (1,000,000)	$ (1,400,000)	$ (1,120,000)
Number of apartment homes in communities owned \| home	82,103
Gain on sale of communities	$ 340,444,000	$ 166,105,000	$ 374,976,000
Number of communities acquired \| community	0	5	4
Payments to acquire other real estate	$ 0	$ 420,517,000	$ 338,620,000
Number of apartment homes acquired \| home		1,175	1,096
AVA North Point
Schedule of Equity Method Investments [Line Items]
Payments to acquire other real estate		$ 71,280,000
2018 Acquisitions [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire other real estate			$ 334,450,000
Avalon Venice on Rose [Member]
Schedule of Equity Method Investments [Line Items]
Retail square feet development \| ft²	9,000
2019 Acquisitions [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire other real estate		$ 345,450,000
US Fund
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	28.60%
Net cash proceeds	$ 65,000,000
Number of apartment communities sold \| community		1	1
US Fund \| Avalon Marina Bay [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale of communities		$ 5,788,000
US Fund \| Avalon Venice on Rose [Member]
Schedule of Equity Method Investments [Line Items]
Number Of Apartment Homes Sold \| home	70
Gain on sale of communities	$ 5,157,000
US Fund \| Avalon Kirkland at Carillon [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale of communities			$ 8,636,000
ACJV
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	20.00%
Number of apartment communities sold \| community			1
ACJV \| Avalon Woodland Park [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale of communities			$ 2,019,000
Legacy JV
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	40.00%
Preferred interest obligation liquidation value	$ 35,382,000
AVA North Point
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		55.00%
Number of apartment homes in communities owned \| home	265
AVA North Point \| Joint Venture Partner
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		45.00%
NYC JV
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	20.00%
Avalon Alderwood Mall [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
Number of apartment communities \| home	328
Fund II
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		31.30%
Percentage of right of distribution		40.00%
Percentage of right of remaining distribution		60.00%
Equity in income of unconsolidated entities relating to the Company's recognition of promoted interest		$ 925,000
AVA Arts District [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	25.00%
Retail square feet development \| ft²	56,000
Number of apartment communities \| home	475
Equity Method Investments	$ 19,500,000
Long-term Construction Loan	$ 165,600,000
Real Estate Investments, Percent of Development Funded by Borrowings	60.00%
Proceeds from Construction Loans Payable	$ 0
AVA Arts District [Member] \| Maximum
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	27,600,000
NYC JV
Schedule of Equity Method Investments [Line Items]
Repayments of secured debt			$ 395,939,000
retail square feet sold \| ft²			58,000
NYC JV
Schedule of Equity Method Investments [Line Items]
Number Of Apartment Homes Sold \| home			1,301
Net cash proceeds			$ 276,799,000
Number of apartment communities sold \| community			5
Gain on sale of communities			$ 179,861,000
Gross sales price			$ 758,900,000
Notes Payable Maturities 2020 \| Secured notes \| Avalon Venice on Rose [Member]
Schedule of Equity Method Investments [Line Items]
Repayments of secured debt	$ 27,117,000