Investments in Partially Owned Entities (Summary of Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Partially Owned Office Buildings
Schedule of Equity Method Investments [Line Items]
Maturity, range, start	2022
Maturity, range, end	2029
Debt instrument, interest rate, effective percentage	2.95%
Equity method investment debt of partially owned entities	$ 3,348,149	$ 3,622,572
Alexanders Inc
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage	32.40%
Maturity, range, start	2024
Maturity, range, end	2027
Debt instrument, interest rate, effective percentage	1.43%
Equity method investment debt of partially owned entities	$ 1,096,544	1,164,544
Fifth Avenue and Times Square JV
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage	51.50%
Maturity, range, start	2022
Maturity, range, end	2024
Debt instrument, interest rate, effective percentage	2.61%
Equity method investment debt of partially owned entities	$ 950,000	950,000
Other equity method investments
Schedule of Equity Method Investments [Line Items]
Maturity, range, start	2022
Maturity, range, end	2026
Debt instrument, interest rate, effective percentage	3.67%
Equity method investment debt of partially owned entities	$ 1,292,012	1,288,265
640 Fifth Avenue
Schedule of Equity Method Investments [Line Items]
Mortgage loans on real estate, face amount of mortgages	500,000	500,000
7 West 34th Street
Schedule of Equity Method Investments [Line Items]
Mortgage loans on real estate, face amount of mortgages	300,000	300,000
Partially Owned Properties
Schedule of Equity Method Investments [Line Items]
Equity method investment pro rata share debt of partially owned entities	$ 2,699,405	$ 2,873,174

Amount of contractual principal due at origination of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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