The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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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 number of units or percentage investment held by one or more members or limited partners of the LLC or LP.

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The number of real estate properties owned as of the balance sheet date.

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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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The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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This amount represents Cash Considerations Transferred During Spin Off.

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This element represents duration information technology, human resources, tax and public reporting services being provided to Urban Edge.

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This element represents the number of real estate properties sold.

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Organization (Details) - Segment [Domain] - Real Estate And Accumulated Depreciation Name Of Property [Domain] - Subsequent Event Type [Domain]		3 Months Ended	6 Months Ended
	Jan. 15, 2015 USD ($) Properties shares	Mar. 31, 2015 Properties	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Organization [Abstract]
Common limited partnership interest in the Operating Partnership			94.00%
Real Estate Properties [Line Items]
Cash Considerations Transferred During Spin Off (in US Dollars) \| $			$ 225,000,000	$ 0
Number Of Real Estate Properties Sold		5
Spin off to Urban Edge [Member]
Real Estate Properties [Line Items]
Cash Considerations Transferred During Spin Off (in US Dollars) \| $	$ 225,000,000
Partnership Units received during spin off \| shares	5,717,184
Number of new shares issued during spin off for every 2 shares/units of Vornado and Vornado L.P. \| shares	1
Equity method ownership percentage	5.40%
Maximum [Member]
Real Estate Properties [Line Items]
Duration Of Administrative Services	2 years
Retail Segment Strip Shopping Centers [Member] \| Spin off to Urban Edge [Member]
Real Estate Properties [Line Items]
Number Of Real Estate Properties	79
Retail Segment Regional Malls [Member] \| Spin off to Urban Edge [Member]
Real Estate Properties [Line Items]
Number Of Real Estate Properties	3
Vornado Realty Trust [Member]
Real Estate Properties [Line Items]
Number of shares/units convered during spin off for 1 share of UE \| shares	2
Warehouse [Member] \| Spin off to Urban Edge [Member]
Real Estate Properties [Line Items]
Number Of Real Estate Properties	1