Redeemable Noncontrolling Interests (Activity of Redeemable Noncontrolling Interests) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Redeemable Noncontrolling Interests Rollforward
Beginning balance			$ 888,915
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	$ (14,364)	$ 162,515	(13,974)	$ 174,717
Other comprehensive income (loss)	5	(1,806)	(2,978)	(3,082)
Ending balance	718,916		718,916
Partnership Interest
Redeemable Noncontrolling Interests Rollforward
Beginning balance	623,799	867,085	888,915	783,562
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	(14,364)	162,515	(13,974)	174,717
Other comprehensive income (loss)	5	(1,806)	(2,978)	(3,082)
Distributions	(9,100)	(8,448)	(17,998)	(16,936)
Other, net	6,997	10,889	22,182	29,337
Ending balance	624,804	862,062	624,804	862,062
Partnership Interest \| Class A Unit
Redeemable Noncontrolling Interests Rollforward
Redemption of Class A units for Vornado common shares, at redemption value	(824)	(2,948)	(2,464)	(6,129)
Adjustments to carry redeemable Class A units at redemption value	18,291	$ (165,225)	(248,879)	$ (99,407)
Subsidiary
Redeemable Noncontrolling Interests Rollforward
Beginning balance	0		0
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	136		136
Contributions	92,400		92,400
Other, net	1,576		1,576
Ending balance	$ 94,112		$ 94,112

Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.

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Amount after tax of other comprehensive income (loss) attributable to noncontrolling interests.

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As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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Adjustments to reflect redeemable Class A Operating Partnership units

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Other Net Attributable To Redeemable Noncontrolling Interest

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Redeemable Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders

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Redeemable Noncontrolling Interest, Increase from Contributions to Noncontrolling Interest Holders

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