Redeemable Noncontrolling Interests/Redeemable Partnership Units (Activity of Redeemable Noncontrolling Interests) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Redeemable Noncontrolling Interests Rollforward
Beginning balance	$ 888,915	$ 783,562
Net income (loss)	390	12,202
Other comprehensive loss	(2,983)	(1,276)
Distributions	(8,898)	(8,488)
Other, net	15,185	18,448
Ending balance	623,799	867,085
Class A Unit
Redeemable Noncontrolling Interests Rollforward
Redemption of Class A units for Vornado common shares, at redemption value	(1,640)	(3,181)
Adjustments to carry redeemable Class A units at redemption value	$ (267,170)	$ 65,818

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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