Redeemable Noncontrolling Interests (Activity of Redeemable Noncontrolling Interests) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Redeemable Noncontrolling Interests Rollforward
Beginning balance			$ 606,267
Net income (loss)	$ 3,536	$ (14,364)	3,865	$ (13,974)
Other comprehensive income (loss)	704	5	1,590	(2,978)
Ending balance	749,684		749,684
Partnership Interest
Redeemable Noncontrolling Interests Rollforward
Beginning balance	640,193	623,799	511,747	888,915
Net income (loss)	3,536	(14,364)	3,865	(13,974)
Other comprehensive income (loss)	704	5	1,590	(2,978)
Distributions	(7,408)	(9,100)	(14,869)	(17,998)
Other, net	5,940	6,997	17,799	22,182
Ending balance	654,771	624,804	654,771	624,804
Partnership Interest | Class A Unit
Redeemable Noncontrolling Interests Rollforward
Redemption of Class A units for Vornado common shares, at redemption value	(4,206)	(824)	(8,309)	(2,464)
Redeemable Class A unit measurement adjustment	16,012	18,291	142,948	(248,879)
Subsidiary
Redeemable Noncontrolling Interests Rollforward
Beginning balance	94,437	0	94,520	0
Net income (loss)	476	136	393	136
Other, net	0	1,576	0	1,576
Ending balance	94,913	94,112	94,913	94,112
Contributions	$ 0	$ 92,400	$ 0	$ 92,400