Real Estate Fund Investments (Income from the Fund and the Co-Investment) (Details) - USD ($)		3 Months Ended	6 Months Ended
Mar. 01, 2011	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Details Of Income From Real Estate Funds
(Loss) income from real estate fund investments		$ (28,976,000)	$ 4,391,000	$ (37,783,000)	$ 4,659,000
Less loss (income) attributable to noncontrolling interests in consolidated subsidiaries		26,175,000	(7,677,000)	34,449,000	(14,414,000)
Fee and Other Income		38,911,000	30,787,000	74,928,000	64,920,000
Real estate fund investments
Details Of Income From Real Estate Funds
Net investment income		539,000	3,646,000	3,273,000	10,860,000
Net unrealized (loss) gain on held investments		(29,513,000)	745,000	(29,513,000)	(6,442,000)
Net realized (loss) gain on exited investments		(2,000)	0	(913,000)	241,000
Transfer Tax		0	0	(10,630,000)	0
(Loss) income from real estate fund investments		(28,976,000)	4,391,000	(37,783,000)	4,659,000
Less loss (income) attributable to noncontrolling interests in consolidated subsidiaries		29,527,000	(4,695,000)	34,896,000	(8,198,000)
Income (loss) from real estate fund investments attributable to the Operating Partnership (six months ended June 30, 2018 includes $4,252 of loss related to One Park Avenue potential additional transfer taxes and reduction in carried interest)		551,000	(304,000)	(2,887,000)	(3,539,000)
Less (income) loss attributable to noncontrolling interests in the Operating Partnership		(34,000)	19,000	178,000	221,000
Income (loss) from real estate fund investments attributable to Vornado		517,000	(285,000)	(2,709,000)	(3,318,000)
Fee and Other Income		$ 1,104,000	$ 1,381,000	1,906,000	$ 2,381,000
One Park Avenue
Details Of Income From Real Estate Funds
Transfer Tax	$ (3,000,000)			(4,978,000)
One Park Avenue \| Real estate fund investments
Details Of Income From Real Estate Funds
Income (loss) from real estate fund investments attributable to the Operating Partnership (six months ended June 30, 2018 includes $4,252 of loss related to One Park Avenue potential additional transfer taxes and reduction in carried interest)				$ (4,252,000)

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=98514028&loc=d3e3602-108585

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Amount of net income (loss) recognized from investments in real estate partnerships and variable interest entities.

+ References

No definition available.

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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 FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 235
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-16(Column G))
-URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915

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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=63488584&loc=d3e20235-122688

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Amount after tax of income (loss) attributable to nonredeemable noncontrolling partner in an operating partnership.

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- Definition

A tax based on the assessed value of real estate by the local government. The tax is usually based on the value of property (including the land).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6419918&loc=d3e35301-107843

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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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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.

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

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