Area of a real estate property.

No definition available.

Name:	us-gaap_AreaOfRealEstateProperty
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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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Balance Type:	na
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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.

+ Details

Name:	us-gaap_InvestmentHoldingsLineItems
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Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Equity Commitment Fund Term, in years

+ References

No definition available.

+ Details

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Namespace Prefix:	vno_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Investment Period Fund

+ References

No definition available.

+ Details

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Namespace Prefix:	vno_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The term of the extension available, in years

+ References

No definition available.

+ Details

Name:	vno_LengthOfExtensionAvailable
Namespace Prefix:	vno_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Investments Held By Fund during the year.

+ References

No definition available.

+ Details

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Namespace Prefix:	vno_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Extensions

+ References

No definition available.

+ Details

Name:	vno_NumberofExtensions
Namespace Prefix:	vno_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the real estate assets related to the fund

+ References

No definition available.

+ Details

Name:	vno_RealEstateFundNondepreciableRealEstate
Namespace Prefix:	vno_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Unfunded Commitments Of the Fund

+ References

No definition available.

+ Details

Name:	vno_UnfundedCommitmentsOfFund
Namespace Prefix:	vno_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_RealEstateFundsMember
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Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=vno_VornadoRealtyTrustExcludingRealEstateFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=vno_CrownePlazaTimeSquareHotelMember
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Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=vno_VornadoRealtyTrustMember
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Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_CorporateJointVentureMember
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Data Type:	na
Balance Type:
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- Details

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Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
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Real Estate Fund Investments (Narrative) (Details) ft² in Thousands, $ in Thousands			12 Months Ended
	Nov. 06, 2019 USD ($) ft² extension	Nov. 05, 2019 USD ($)	Dec. 31, 2019 USD ($) investment	Dec. 31, 2018 USD ($) investment
Investment Holdings
Real estate fund investments			$ 222,649	$ 318,758
Vornado Capital Partners Real Estate Fund
Investment Holdings
Term of the Fund, years			8 years
Investment period for commitments of the Fund, years			3 years
Real estate fund investments
Investment Holdings
Equity method ownership percentage			25.00%
Number of investments held by fund \| investment			4	4
Real estate fund investments			$ 222,649	$ 318,758
Excess of fair value below cost			112,915
Unfunded commitments of Fund			$ 35,194
Vornado Realty Trust Excluding Real Estate Fund \| Crowne Plaza Time Square Hotel
Investment Holdings
Equity method ownership percentage			24.70%
Vornado Realty Trust
Investment Holdings
Unfunded commitments of Fund			$ 11,242
Joint Venture \| Crowne Plaza Time Square Hotel
Investment Holdings
Equity method ownership percentage			57.10%
Lucida
Investment Holdings
Refinancing	$ 145,075	$ 146,000
Square footage of real estate property (in sqft) \| ft²	155
Debt term (years)	3 years
Number of extensions (extension) \| extension	2
Length of extension available (years)	1 year
Debt instrument, interest rate, effective percentage			3.54%
LIBOR \| Lucida
Investment Holdings
Spread Over LIBOR (in percentage)	1.85%
Matures in December 2019 \| LIBOR \| Lucida
Investment Holdings
Spread Over LIBOR (in percentage)		1.55%