Real Estate Fund Investments (Narratives) (Details) $ in Thousands	3 Months Ended
Mar. 31, 2016 USD ($) Investments	Dec. 31, 2015 USD ($)
Investment Holdings [Line Items]
Aggregate fair value of Real Estate Fund investments (in US Dollars)	$ 566,696	$ 574,761
Real Estate Fund Joint Venture [Member]
Investment Holdings [Line Items]
Equity method ownership percentage	75.30%
Co Investment [Member]
Investment Holdings [Line Items]
Equity method ownership percentage	24.70%
Real Estate Fund [Member]
Investment Holdings [Line Items]
Aggregate fair value of Real Estate Fund investments (in US Dollars)	$ 566,696
Term of the Fund, years	8 years
Investment period for commitments of the Fund, years	3 years
Number Of Investments Held By Fund \| Investments	6
Excess of fair value over cost	$ 200,549
Unfunded Commitments Of Fund	102,212
Vornado Realty Trust [Member]
Investment Holdings [Line Items]
Unfunded Commitments Of Fund	$ 25,553

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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- Definition

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.

+ References

No definition available.

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- Definition

Equity Commitment Fund Term, in years

+ References

No definition available.

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- Definition

The amount of excess fair value of investments over it's cost.

+ References

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- Definition

Investment Period Fund

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- Definition

Number Of Investments Held By Fund during the year.

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- Definition

This element represents the real estate assets related to the fund

+ References

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- Definition

Unfunded Commitments Of the Fund

+ References

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