Real Estate Fund Investments (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Details Of Income From Real Estate Funds [Abstract]
Income from real estate fund investments	$ 1,077	$ 1,665	$ 28,750	$ 52,122
Less income attributable to noncontrolling interests	(3,658)	(3,302)	(26,361)	(38,370)
Fee And Other Income	37,774	34,161	105,433	112,998
Real estate fund investments
Details Of Income From Real Estate Funds [Abstract]
Net investment income	5,841	5,116	12,237	13,716
Net unrealized (losses) gains on held investments	(4,764)	(2,544)	16,091	37,001
Net realized (losses) gains on exited investments	0	(907)	14,676	24,684
Previously recorded unrealized gain on exited investment	0	0	(14,254)	(23,279)
Income from real estate fund investments	1,077	1,665	28,750	52,122
Less income attributable to noncontrolling interests	(270)	(42)	(15,088)	(29,453)
Income from real estate fund investments attributable to Vornado	807	1,623	13,662	22,669
Fee And Other Income	$ 804	$ 678	$ 2,499	$ 2,015

The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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- Definition

Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.2)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 16
-Article 12

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- Definition

Amount after tax of income (loss) attributable to nonredeemable noncontrolling shareholder, unit holder, partner, or other equity holder of a joint venture.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.19)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

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- References

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- Definition

Revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations, and other real estate revenue not otherwise specified in the taxonomy.

+ References

No definition available.

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- Definition

This element represents the income (loss) from the Real Estate Fund before allocation to noncontrolling interests

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- Definition

This element represents income from the real estate fund net of amounts attributable to noncontrolling interests

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- Definition

This element represents previously recorded unrealized gains on exited investments.

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No definition available.

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