Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
ASSETS
Deferred leasing costs, accumulated amortization	$ 188,976	$ 196,229
Identified intangible assets, accumulated amortization	$ 100,298	$ 98,587
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS / PARTNERSHIP UNITS AND EQUITY
Preferred shares of beneficial interest: par value per share (in dollars per share)	$ 0	$ 0
Preferred shares of beneficial interest: authorized shares (shares)	110,000,000	110,000,000
Preferred shares of beneficial interest: issued shares (shares)	36,795,540	36,795,640
Preferred shares of beneficial interest: outstanding shares (shares)	36,795,540	36,795,640
Common shares of beneficial interest: par value per share (in dollars per share)	$ 0.04	$ 0.04
Common shares of beneficial interest: authorized shares (shares)	250,000,000	250,000,000
Common shares of beneficial interest: issued shares (shares)	191,115,726	190,985,677
Common shares of beneficial interest: outstanding shares (shares)	191,115,726	190,985,677
Class A Unit
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS / PARTNERSHIP UNITS AND EQUITY
Outstanding Partnership Units held by Third Parties (units)	13,748,709	13,298,956
Cumulative Redeemable Preferred Unit
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS / PARTNERSHIP UNITS AND EQUITY
Outstanding Partnership Units held by Third Parties (units)	141,401	141,401
Vornado Realty L.P.
ASSETS
Deferred leasing costs, accumulated amortization	$ 188,976	$ 196,229
Identified intangible assets, accumulated amortization	$ 100,298	$ 98,587
Vornado Realty L.P. \| Class A Unit
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS / PARTNERSHIP UNITS AND EQUITY
Outstanding Partnership Units held by Third Parties (units)	13,748,709	13,298,956
Vornado Realty L.P. \| Cumulative Redeemable Preferred Unit
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS / PARTNERSHIP UNITS AND EQUITY
Outstanding Partnership Units held by Third Parties (units)	141,401	141,401

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