Business Combination, Acquisition Related Costs, Abandoned Pursuit Costs

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The charge against earnings in the period to reduce the carrying amount of real property to fair value resulting from a casualty event.

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Number of Land Parcels Impaired

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Percentage of the Variable Interest Entity's (VIE) voting interest not owned by the reporting entity.

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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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No definition available.

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For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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- Definition

The net amount (to the extent disclosed within this portion of the income statement) by which an insurance settlement exceeds incremental costs incurred from the event causing an interruption of business, plus the insurance award for earnings lost from the event, such as a natural catastrophe, explosion or fire.

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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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-Name Accounting Standards Codification
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Amount of other expense that is infrequent in occurrence or unusual in nature.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets.

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No definition available.

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The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to investments, for example fixed assets. It excludes insurance settlements classified as operating cash flows.

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Amount of real estate investment property, 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; and (7) other real estate investments.

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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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No definition available.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Investments in Real Estate Entities (Details 3) $ in Thousands	3 Months Ended		15 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($) land_parcel	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs, Abandoned Pursuit Costs	$ 728	$ 746
Real Estate [Line Items]
Casualty and impairment loss (gain), net	(11,688)	$ 2,202
Number of land parcels impaired \| land_parcel		2
Net operating real estate	15,171,803			$ 15,045,593
Insurance proceeds for property damage claims	4,095	$ 8,702
Insurance proceeds receivable	287,130			$ 256,934
Land [Member]
Real Estate [Line Items]
Casualty and impairment loss (gain), net	(9,350)	(6,500)
Avalon Maplewood [Member]
Real Estate [Line Items]
Casualty and impairment loss (gain), net	(2,338)
Casualty loss	19,481
Net operating real estate	16,361
Other nonrecurring expense	3,120
Insurance Recoveries	17,143
Insurance proceeds for property damage claims	4,545
Insurance proceeds receivable	$ 12,598
Avalon at Edgewater [Member]
Real Estate [Line Items]
Casualty and impairment loss (gain), net		8,702
Insurance Recoveries		29,008	$ 73,150
Gain on business interruption insurance recovery		$ 20,306
Avalon Brooklyn Bay [Member]
Business Acquisition [Line Items]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	70.00%
Variable Interest Entity, Ownership Interest by Partner	30.00%
Due from Related Parties	$ 32,036