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Investments in Partially Owned Entities (Fifth Avenue and Times Square JV) (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended			9 Months Ended
	Jun. 30, 2020	Apr. 30, 2019	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Schedule Of Equity Method Investments
Real estate held-for-sale			$ 181,041			$ 181,041		$ 408,918
Net gain on transfer to Fifth Avenue and Times Square JV			0		$ 0	0	$ 2,571,099
Non-cash impairment loss						0	(26,140)
Building Maintenance Service
Schedule Of Equity Method Investments
Other real estate revenue from equity method investees			792		1,161	2,565	1,952
Majority-Owned Subsidiary \| Building Maintenance Service
Schedule Of Equity Method Investments
Revenue from related parties			$ 1,219		1,104	$ 2,880	1,934
Fifth Avenue and Times Square JV
Schedule Of Equity Method Investments
Equity method ownership percentage			51.50%			51.50%
Real estate held-for-sale	$ 2,955,957	$ 5,556,000	$ 2,811,374	$ 2,955,957		$ 2,811,374
Net gain on transfer to Fifth Avenue and Times Square JV		$ 2,571,000
Non-cash impairment loss	$ (306,326)		(107,023)	(306,326)	$ 0	(413,349)	$ 0
Non-cash impairment loss related to noncontrolling interest			3,822	$ 467		4,289
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%			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
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