Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Share-based Compensation Arrangement by Share-based Payment Award, Special Allocation

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Share-based Compensation Arrangement by Share-based Payment Award, Threshold Level

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Special Distribution, Percent

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Stock-based Compensation (AO LTIP Units & Vornado Stock Options Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jan. 12, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)		4 years
Proceeds received from exercise of employee share options and other		$ 7,309	$ 29,712	$ 8,269
AO LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Threshold level, percent		100.00%
Special allocation, percent	10.00%
Special distribution, percent	10.00%
Stock options expiration term		10 years
Grant-date fair value		$ 3,484
Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)		4 years
Stock options expiration term		10 years
Grants in period, weighted average grant date fair value		$ 18.42	$ 25.84	$ 22.14
Proceeds received from exercise of employee share options and other		$ 5,927	$ 28,253	$ 6,825
Exercises in period, intrinsic value		$ 25,820	$ 9,178	$ 5,519