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The difference between the carrying value and the sale price of equity securities, not separately or otherwise categorized as trading or available-for-sale. This element includes investments in which the entity holds a small ownership stake (generally, less than 20% of the shares outstanding) and cannot exert significant influence.

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Investments in Partially Owned Entities (330 Madison Avenue, 825 Seventh Avenue, Toys R Us, Inc., 650 Madison Avenue and 50-70 West 93rd Street) (Details) ft² in Thousands	Dec. 23, 2019 USD ($) unit	Dec. 22, 2019 USD ($)	Nov. 26, 2019 USD ($) ft²	Jul. 25, 2019 USD ($) ft²	Jul. 24, 2019 USD ($)	Jul. 11, 2019 USD ($)	Dec. 31, 2019 USD ($)	Nov. 25, 2019 USD ($)	Apr. 18, 2019	Feb. 01, 2019	Dec. 31, 2018 USD ($)
330 Madison Avenue
Schedule of Equity Method Investments [Line Items]
Gain (loss) on sale of equity investments						$ 159,292,000
Realized gain on disposal						139,000,000
Toys R Us
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage										32.50%
Total equity method investment											$ 0
Tax basis of investments, cost for income tax purposes							$ 420,000,000
Fifth Avenue and Times Square JV
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage							51.50%
330 Madison Avenue
Schedule of Equity Method Investments [Line Items]
Debt proceeds, net						100,000,000
Loans repaid						$ 500,000,000
Residential Properties \| 50-70 West 93rd Street
Schedule of Equity Method Investments [Line Items]
Number of units (units) \| unit	325
Matures in 2022 \| Office Building \| 825 Seventh Avenue
Schedule of Equity Method Investments [Line Items]
Loans repaid				$ 60,000,000			$ 31,889,000
Square footage of real estate property (in sqft) \| ft²				165
Debt instrument, interest rate, stated percentage							3.40%
Length of extension available (years)				1 year
Maturing in September 2019 \| Office Building \| 825 Seventh Avenue
Schedule of Equity Method Investments [Line Items]
Loans repaid					$ 20,500,000
Matures in December 2029 \| Office and Retail Property \| 650 Madison Avenue
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage			20.10%
Loans repaid			$ 800,000,000
Square footage of real estate property (in sqft) \| ft²			601
Debt instrument, interest rate, stated percentage			3.49%
Debt term (years)			10 years
Matures in October 2020 \| Office and Retail Property \| 650 Madison Avenue
Schedule of Equity Method Investments [Line Items]
Loans repaid								$ 800,000,000
Debt instrument, interest rate, stated percentage								4.39%
Matures in December 2024 \| Office and Retail Property \| 50-70 West 93rd Street
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage	49.90%
Loans repaid	$ 85,500,000						$ 82,500,000
Debt term (years)	5 years
Matures in December 2024 \| Residential Properties \| 50-70 West 93rd Street
Schedule of Equity Method Investments [Line Items]
Debt instrument, interest rate, stated percentage	3.14%
Matures in August 2020 \| Office and Retail Property \| 50-70 West 93rd Street
Schedule of Equity Method Investments [Line Items]
Loans repaid		$ 80,000,000
Joint Venture \| 330 Madison Avenue
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage						25.00%
Joint Venture \| 825 Seventh Avenue
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage				50.00%
Joint Venture \| Fifth Avenue and Times Square JV
Schedule of Equity Method Investments [Line Items]
Debt instrument, interest rate, stated percentage									4.25%
LIBOR \| Matures in 2022 \| Office Building \| 825 Seventh Avenue
Schedule of Equity Method Investments [Line Items]
Spread Over LIBOR (in percentage)				1.65%
LIBOR \| Maturing in September 2019 \| Office Building \| 825 Seventh Avenue
Schedule of Equity Method Investments [Line Items]
Spread Over LIBOR (in percentage)					1.40%
LIBOR \| Matures in December 2024 \| Office and Retail Property \| 50-70 West 93rd Street
Schedule of Equity Method Investments [Line Items]
Spread Over LIBOR (in percentage)	1.53%
LIBOR \| Matures in August 2020 \| Office and Retail Property \| 50-70 West 93rd Street
Schedule of Equity Method Investments [Line Items]
Spread Over LIBOR (in percentage)		1.70%
Vornado Realty Trust \| Joint Venture \| Fifth Avenue and Times Square JV
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage									51.50%
Investors \| Joint Venture \| Fifth Avenue and Times Square JV
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage									48.50%
Investors \| Vornado Realty Trust \| Joint Venture \| Fifth Avenue and Times Square JV
Schedule of Equity Method Investments [Line Items]
Equity method investment, effective ownership transferred percentage									45.40%