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Investments in Partially Owned Entities Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 18, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Schedule Of Equity Method Investments
Net gain on transfer to Fifth Avenue and Times Square JV		$ 0	$ 2,571,099	$ 0	$ 2,571,099
Real estate held-for-sale		426,623		426,623		$ 408,918
Non-cash impairment loss				0	(26,140)
Building Maintenance Service
Schedule Of Equity Method Investments
Other real estate revenue from equity method investees		748	791	1,773	791
Majority-Owned Subsidiary \| Building Maintenance Service
Schedule Of Equity Method Investments
Revenue from related parties		$ 629	830	$ 1,661	830
Fifth Avenue and Times Square JV
Schedule Of Equity Method Investments
Equity method ownership percentage		51.50%		51.50%
Net gain on transfer to Fifth Avenue and Times Square JV	$ 2,571,000
Real estate held-for-sale	5,556,000	$ 2,955,957		$ 2,955,957
Non-cash impairment loss		(306,326)	$ 0	(306,326)	$ 0
Non-cash impairment loss related to noncontrolling interest		467
Fifth Avenue and Times Square JV \| Joint Venture
Schedule Of Equity Method Investments
Aggregate of preferred equity interests		$ 1,828,000		$ 1,828,000
Fifth Avenue and Times Square JV \| Joint Venture \| Investors
Schedule Of Equity Method Investments
Equity method ownership percentage		48.50%		48.50%
Equity method effective ownership percentage		47.20%		47.20%
Fifth Avenue and Times Square JV \| Joint Venture \| Percentage For First Five Years
Schedule Of Equity Method Investments
Debt instrument, interest rate, stated percentage (percent)		4.25%		4.25%
Fifth Avenue and Times Square JV \| Joint Venture \| Percentage After Fifth Anniversary
Schedule Of Equity Method Investments
Debt instrument, interest rate, stated percentage (percent)		4.75%		4.75%
Fifth Avenue and Times Square JV \| Vornado Realty Trust \| Joint Venture
Schedule Of Equity Method Investments
Equity method ownership percentage		51.50%		51.50%
Equity method effective ownership percentage		51.00%		51.00%
Net gain from real estate investment partnership, attributable to noncontrolling interest	$ 11,945