Area of a real estate property.

No definition available.

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Balance Type:	na
Period Type:	instant

- 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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Namespace Prefix:	us-gaap_
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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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Balance Type:	na
Period Type:	instant

- 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://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=66011266&loc=d3e33918-111571

+ Details

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- Definition

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.

+ References

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

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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Balance Type:	credit
Period Type:	duration

- 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

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Balance Type:	na
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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16)(a)(2))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Cash received for the sale of real estate that is not part of an investing activity during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Earn-Out Provision

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

Investment Period Fund

+ References

No definition available.

+ Details

Name:	vno_InvestmentPeriodFund
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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Namespace Prefix:
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- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=vno_SantaMonicaOffice520BroadwayMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

Name:	dei_LegalEntityAxis=us-gaap_CorporateJointVentureMember
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Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=vno_LoansDueJuly2022Member
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=vno_ElevenHundredLincolnRoadMember
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Data Type:	na
Balance Type:
Period Type:

- Details

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Real Estate Fund Investments (Narrative) (Details) ft² in Thousands				12 Months Ended			35 Months Ended
	Sep. 29, 2017 USD ($)	Jul. 27, 2017 USD ($) ft² extension	Mar. 25, 2015 USD ($)	Dec. 31, 2017 USD ($) investment	Dec. 31, 2016 USD ($) investment	Dec. 31, 2015 USD ($)	Mar. 25, 2015 USD ($)
Investment Holdings
Number of investments held by fund \| investment				5	6
Real estate fund investments				$ 354,804,000	$ 462,132,000
Net gains on sale of real estate and a lease position				$ 3,489,000	5,074,000	$ 65,396,000
Real estate fund investments
Investment Holdings
Equity method ownership percentage				25.00%
Real estate fund investments				$ 354,804,000
Excess of fair value over cost				98,189,000
Unfunded commitments of Fund				117,872,000
Net realized gains on exited investments				$ 36,078,000	$ 14,761,000	$ 26,036,000
Real estate fund investments \| Santa Monica, CA Office 520 Broadway
Investment Holdings
Cash proceeds from sale of real estate			$ 91,650,000
Net realized gains on exited investments							$ 23,768,000
Vornado Capital Partners Real Estate Fund
Investment Holdings
Investment period for commitments of the Fund, years				3 years
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				$ 34,502,000
Eight Hundred Corporate Pointe
Investment Holdings
Cash proceeds from sale of real estate	$ 148,000,000
Net gains on sale of real estate and a lease position	$ 35,620,000
Joint Venture \| Crowne Plaza Time Square Hotel
Investment Holdings
Equity method ownership percentage				57.10%
Loans Due July 2022 \| Eleven Hundred Lincoln Road
Investment Holdings
Loans payable		$ 100,000,000
Square footage of real estate property \| ft²		130
Debt instrument, interest rate, effective percentage				3.76%
Number of extensions \| extension		2
Length of extension available		1 year
Debt drawn on		$ 82,750,000
Earn-out provision		$ 17,250,000
Loans Due July 2022 \| Eleven Hundred Lincoln Road \| LIBOR
Investment Holdings
Spread Over LIBOR (in percentage)		2.40%
Loans Due August 2017 \| Eleven Hundred Lincoln Road
Investment Holdings
Loans payable		$ 66,000,000
Loans Due August 2017 \| Eleven Hundred Lincoln Road \| LIBOR
Investment Holdings
Spread Over LIBOR (in percentage)		2.25%