Stock-based Compensation (Performance Conditioned AO LTIP Units Vornado Stock Options) (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares
Vornado stock options
Shares
Options outstanding at beginning of period (shares) | shares	765,637
Exercised (shares) | shares	(598)
Forfeited (shares) | shares	(3,008)
Expired (shares) | shares	(570,098)
Options outstanding at end of period (shares) | shares	191,933
Option exercisable at end of period (shares) | shares	124,805
Weighted- Average Exercise Price
Options outstanding at beginning of period (in usd per share) | $ / shares	$ 64.79
Exercised (in usd per share) | $ / shares	36.72
Forfeited (in usd per share) | $ / shares	56.92
Expired (in usd per share) | $ / shares	64.70
Options outstanding at end of period (in usd per share) | $ / shares	65.27
Options exercisable at end of period (in usd per share) | $ / shares	$ 70.13
Weighted- Average Remaining Contractual Term
Options outstanding, Weighted Average Remaining Contractual Term	5 years 9 months
Options exercisable, Weighted Average Remaining Contractual Term	4 years 8 months 15 days
Aggregate Intrinsic Value
Options outstanding, Aggregate Intrinsic Value | $	$ 152,920
Options exercisable, Aggregate Intrinsic Value | $	$ 37,820
Performance Conditioned AO LTIP Units
Shares
Options outstanding at beginning of period (shares) | shares	496,792
Options outstanding at end of period (shares) | shares	496,792
Option exercisable at end of period (shares) | shares	322,313
Weighted- Average Exercise Price
Options outstanding at beginning of period (in usd per share) | $ / shares	$ 62.62
Options outstanding at end of period (in usd per share) | $ / shares	62.62
Options exercisable at end of period (in usd per share) | $ / shares	$ 62.62
Weighted- Average Remaining Contractual Term
Options outstanding, Weighted Average Remaining Contractual Term	7 years 14 days
Options exercisable, Weighted Average Remaining Contractual Term	7 years 14 days
Aggregate Intrinsic Value
Options outstanding, Aggregate Intrinsic Value | $	$ 0
Options exercisable, Aggregate Intrinsic Value | $	$ 0
AO LTIP Units
Shares
Options outstanding at beginning of period (shares) | shares	717,581
Exercised (shares) | shares	(16,669)
Forfeited (shares) | shares	(60,927)
Expired (shares) | shares	(72,246)
Options outstanding at end of period (shares) | shares	567,739
Option exercisable at end of period (shares) | shares	327,535
Weighted- Average Exercise Price
Options outstanding at beginning of period (in usd per share) | $ / shares	$ 59.71
Exercised (in usd per share) | $ / shares	36.72
Forfeited (in usd per share) | $ / shares	56.30
Expired (in usd per share) | $ / shares	66.32
Options outstanding at end of period (in usd per share) | $ / shares	59.91
Options exercisable at end of period (in usd per share) | $ / shares	$ 61.83
Weighted- Average Remaining Contractual Term
Options outstanding, Weighted Average Remaining Contractual Term	7 years 3 months 14 days
Options exercisable, Weighted Average Remaining Contractual Term	7 years 21 days
Aggregate Intrinsic Value
Options outstanding, Aggregate Intrinsic Value | $	$ 640,711
Options exercisable, Aggregate Intrinsic Value | $	$ 279,164