Investments in Unconsolidated Joint Ventures - Schedule of Mortgage Notes and Other Loans Payable Collateralized by the Respective Joint Venture Properties and Assignment of Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Total fixed rate debt	$ 2,075,222	$ 1,587,474
Total floating rate debt	79,277	363,550
Due from joint ventures
Debt Instrument [Line Items]
Total fixed rate debt	10,791,783	11,551,101
Total floating rate debt	1,687,249	780,889
Total joint venture mortgages and other loans payable, net	12,378,150	12,234,261
Deferred financing costs, net	(100,882)	(97,729)
Total joint venture mortgages and other loans payable	12,479,032	12,331,990
Due from joint ventures | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt	5,415,627	5,728,933
Total floating rate debt	481,571	298,929
Total joint venture mortgages and other loans payable, net	5,846,722	5,978,804
Deferred financing costs, net	(50,476)	(49,058)
Total joint venture mortgages and other loans payable	$ 5,897,198	6,027,862
650 Fifth Avenue | Wharton Properties | Due from joint ventures
Debt Instrument [Line Items]
Economic Interest (as a percent)	50.00%
Interest rate, fixed rate debt (as a percent)	5.45%
Total fixed rate debt	$ 65,000	65,000
650 Fifth Avenue | Wharton Properties | Due from joint ventures | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt	$ 32,500	32,500
15 Beekman | A fund managed by Meritz Alternative Investment Management | Due from joint ventures
Debt Instrument [Line Items]
Economic Interest (as a percent)	20.00%
Interest rate, fixed rate debt (as a percent)	5.99%
Total fixed rate debt	$ 120,000	120,000
15 Beekman | A fund managed by Meritz Alternative Investment Management | Due from joint ventures | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt	$ 24,000	24,000
115 Spring Street | Private Investors | Due from joint ventures
Debt Instrument [Line Items]
Economic Interest (as a percent)	51.00%
Interest rate, fixed rate debt (as a percent)	5.50%
Total fixed rate debt	$ 65,550	65,550
115 Spring Street | Private Investors | Due from joint ventures | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt	$ 33,431	33,431
1515 Broadway | Allianz Real Estate of America | Due from joint ventures
Debt Instrument [Line Items]
Economic Interest (as a percent)	56.87%
Interest rate, fixed rate debt (as a percent)	3.93%
Total fixed rate debt	$ 718,949	740,947
1515 Broadway | Allianz Real Estate of America | Due from joint ventures | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt	$ 408,859	421,369
919 Third Avenue | New York State Teacher's Retirement System | Due from joint ventures
Debt Instrument [Line Items]
Economic Interest (as a percent)	51.00%
Interest rate, fixed rate debt (as a percent)	6.11%
Total fixed rate debt	$ 500,000	500,000
919 Third Avenue | New York State Teacher's Retirement System | Due from joint ventures | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt	$ 255,000	255,000
280 Park Avenue | Vornado Realty Trust | Due from joint ventures
Debt Instrument [Line Items]
Economic Interest (as a percent)	50.00%
Interest rate, fixed rate debt (as a percent)	5.84%
Total fixed rate debt	$ 1,075,000	1,075,000
280 Park Avenue | Vornado Realty Trust | Due from joint ventures | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt	$ 537,500	537,500
245 Park Avenue | U.S. Affiliate of Mori Trust Co., Ltd | Due from joint ventures
Debt Instrument [Line Items]
Economic Interest (as a percent)	50.10%
Interest rate, fixed rate debt (as a percent)	4.30%
Total fixed rate debt	$ 1,768,000	1,768,000
245 Park Avenue | U.S. Affiliate of Mori Trust Co., Ltd | Due from joint ventures | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt	$ 885,768	885,768
Worldwide Plaza | RXR Realty / New York REIT | Due from joint ventures
Debt Instrument [Line Items]
Economic Interest (as a percent)	25.05%
Interest rate, fixed rate debt (as a percent)	3.98%
Total fixed rate debt	$ 1,200,000	1,200,000
Worldwide Plaza | RXR Realty / New York REIT | Due from joint ventures | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt	$ 300,600	299,400
220 East 42nd Street | A fund managed by Meritz Alternative Investment Management | Due from joint ventures
Debt Instrument [Line Items]
Economic Interest (as a percent)	51.00%
Interest rate, fixed rate debt (as a percent)	6.77%
Total fixed rate debt	$ 496,412	496,412
220 East 42nd Street | A fund managed by Meritz Alternative Investment Management | Due from joint ventures | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt	253,170	253,170
100 Park Avenue
Debt Instrument [Line Items]
Total floating rate debt	$ 0	360,000
100 Park Avenue | Due from joint ventures
Debt Instrument [Line Items]
Economic Interest (as a percent)	50.80%
100 Park Avenue | Rockpoint Capital | Due from joint ventures
Debt Instrument [Line Items]
Economic Interest (as a percent)	50.80%
Interest rate, fixed rate debt (as a percent)	5.73%
Total fixed rate debt	$ 382,872	0
100 Park Avenue | Rockpoint Capital | Due from joint ventures | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt	$ 194,499	0
11 Madison Avenue | PGIM Real Estate | Due from joint ventures
Debt Instrument [Line Items]
Economic Interest (as a percent)	60.00%
Interest rate, fixed rate debt (as a percent)	5.62%
Total fixed rate debt	$ 1,400,000	1,400,000
11 Madison Avenue | PGIM Real Estate | Due from joint ventures | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt	$ 840,000	840,000
One Vanderbilt Avenue | National Pension Service of Korea / Hines Interest LP / Mori Building Co., Ltd | Due from joint ventures
Debt Instrument [Line Items]
Economic Interest (as a percent)	55.01%
Interest rate, fixed rate debt (as a percent)	2.95%
Total fixed rate debt	$ 3,000,000	3,000,000
One Vanderbilt Avenue | National Pension Service of Korea / Hines Interest LP / Mori Building Co., Ltd | Due from joint ventures | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt	1,650,300	1,800,300
800 Third Avenue
Debt Instrument [Line Items]
Total fixed rate debt	$ 177,000	0
800 Third Avenue | Private Investors | Due from joint ventures
Debt Instrument [Line Items]
Economic Interest (as a percent)
Interest rate, fixed rate debt (as a percent)
Total fixed rate debt	$ 0	177,000
800 Third Avenue | Private Investors | Due from joint ventures | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt	$ 0	107,120
450 Park Avenue | Korean Institutional Investor / Israeli Institutional Investor | Due from joint ventures
Debt Instrument [Line Items]
Economic Interest (as a percent)	25.10%
Interest rate, fixed rate debt (as a percent)
Total fixed rate debt	$ 0	284,835
Interest rate, floating rate debt (as a percent)	2.10%
Total floating rate debt	$ 290,435	0
450 Park Avenue | Korean Institutional Investor / Israeli Institutional Investor | Due from joint ventures | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt	0	71,494
Total floating rate debt	72,899	0
One Madison Avenue | Due from joint ventures | Construction Loans
Debt Instrument [Line Items]
Maximum facility capacity	$ 1,250,000
One Madison Avenue | National Pension Service of Korea / Hines Interest LP / International Investor | Due from joint ventures
Debt Instrument [Line Items]
Economic Interest (as a percent)	25.50%
Interest rate, fixed rate debt (as a percent)
Total fixed rate debt	$ 0	658,357
Interest rate, floating rate debt (as a percent)	2.60%
Total floating rate debt	$ 1,163,814	354,757
One Madison Avenue | National Pension Service of Korea / Hines Interest LP / International Investor | Due from joint ventures | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt	0	167,881
Total floating rate debt	$ 296,772	90,463
11 West 34th Street | Private Investor / Wharton Properties | Due from joint ventures
Debt Instrument [Line Items]
Economic Interest (as a percent)	30.00%
Interest rate, floating rate debt (as a percent)	1.45%
Total floating rate debt	$ 23,000	23,000
11 West 34th Street | Private Investor / Wharton Properties | Due from joint ventures | Common Stock
Debt Instrument [Line Items]
Total floating rate debt	$ 6,900	6,900
1552-1560 Broadway | Korean Institutional Investor / Israeli Institutional Investor | Due from joint ventures
Debt Instrument [Line Items]
Economic Interest (as a percent)	50.00%
650 Fifth Avenue | Wharton Properties | Due from joint ventures
Debt Instrument [Line Items]
Economic Interest (as a percent)	50.00%
Interest rate, floating rate debt (as a percent)	2.25%
Total floating rate debt	$ 210,000	210,000
650 Fifth Avenue | Wharton Properties | Due from joint ventures | Common Stock
Debt Instrument [Line Items]
Total floating rate debt	$ 105,000	105,000
1552 Broadway | Wharton Properties | Due from joint ventures
Debt Instrument [Line Items]
Economic Interest (as a percent)
Interest rate, floating rate debt (as a percent)
Total floating rate debt	$ 0	193,132
1552 Broadway | Wharton Properties | Due from joint ventures | Common Stock
Debt Instrument [Line Items]
Total floating rate debt	$ 0	$ 96,566