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Number of shares authorized for issuance under share-based payment arrangement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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Amount of Basis Points by Which Vornado Underperforms the Index

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Amount of Basis Points by Which Vornado Underperforms the Index Per Annum

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The period of time during which the performance of the stock will be evaluated to calculate the earning of the stock based awards.

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Percentage Awards Will Be Reduced if Total Shareholder Return Is Zero or Negative

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Percentage of shareholder return required under any plan before any payments will be awarded.

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Minimum percentage of shareholder return for four years before any payout is made under the out performance plan.

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Minimum percentage of shareholder return per year before any payout is made under the out performance plan.

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Required percentage of shareholder return under the Relative plan. If this percentage is not met, then the total award is reduced based on the absolute TSR plan.

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The fair value at grant date for equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Percentage of share based compensation notional amount granted.

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The aggregate notional amount of the out performance plan.

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Share Based Compensation, Maximum Award

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Share Based Compensation, Percent Vested, Year Four

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Stock-based Compensation (Out Performance Plans Narrative) (Details)		12 Months Ended
	Jan. 12, 2021 USD ($) component	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Full Value Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares) \| shares		3,490,000
OPPs
Out Performance Plan
Share-based compensation expense		$ 6,140,000	$ 7,583,000	$ 8,040,000
Out Performance Plan 2021
Out Performance Plan
Out of performance plan notional amount	$ 30,000,000	$ 30,000,000
Duration of performance measurement period	4 years
Number of components of out performance plan \| component	2
Share based compensation, maximum award	$ 30,000,000
Amount of basis points by which Vornado underperforms the index	2.00%
Amount of basis points by which Vornado underperforms the index, total	8.00%
Percentage of notional amount granted		99.10%
Grant-date fair value		$ 9,950,000
OPP Units Earned		To be determined in 2025
Out Performance Plan 2020
Out Performance Plan
Out of performance plan notional amount		$ 35,000,000
Percentage of notional amount granted		94.00%
Grant-date fair value		$ 11,700,000
OPP Units Earned		To be determined in 2023
Out Performance Plan 2018
Out Performance Plan
Out of performance plan notional amount		$ 35,000,000
Percentage of notional amount granted		78.20%
Grant-date fair value		$ 10,300,000
Absolute \| Maximum
Out Performance Plan
Duration of performance measurement period		4 years
Absolute \| Minimum
Out Performance Plan
Duration of performance measurement period		3 years
Absolute \| Out Performance Plan 2021
Out Performance Plan
Required shareholder return four year	28.00%
Duration of performance measurement period	4 years
Absolute \| Out Performance Plan 2021 \| Maximum
Out Performance Plan
Percentage awards will be reduced if total shareholder return is zero or negative	50.00%
Percent vested, year four	50.00%
Percent vested, year five	50.00%
Relative \| Out Performance Plan 2021
Out Performance Plan
Required shareholder return under relative component	2.00%
Percentage of shareholder return under which 50% of awards will be earned	0.00%
Relative \| Out Performance Plan 2021 \| Maximum
Out Performance Plan
Percentage awards will be reduced if total shareholder return is zero or negative	50.00%
SNL US Office REIT Index \| Relative \| Out Performance Plan 2021
Out Performance Plan
Required shareholder return per year	80.00%
SNL US Retail Index \| Relative \| Out Performance Plan 2021
Out Performance Plan
Required shareholder return per year	20.00%
2019 Omnibus Share Plan \| Full Value Awards \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares) \| shares		5,500,000
2019 Omnibus Share Plan \| Not Full Value Awards \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares) \| shares		11,000,000