Investments in Unconsolidated Joint Ventures - Schedule of Investments in Unconsolidated Joint Ventures Sold (Details) - USD ($) $ in Thousands	1 Months Ended								3 Months Ended		12 Months Ended
	Sep. 30, 2025	Jul. 31, 2025	Apr. 30, 2025	Nov. 30, 2024	May 31, 2024	Jan. 31, 2024	Dec. 31, 2023	Feb. 28, 2023	Jun. 30, 2025	Mar. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Gain (Loss) on Sale											$ 86,068	$ 208,144	$ (13,368)
Employee-related liabilities							$ 2,000				11,000	16,800	2,000
Carrying value of investment in leasehold interest							$ 6,102,864				7,159,632	6,607,741	6,102,864	$ 9,198,799
Charge for capital contributions											32,092	$ 104,071	$ 382,374
625 Madison Avenue
Schedule of Equity Method Investments [Line Items]
Charge for capital contributions										$ 5,900
Preferred Equity | 625 Madison Avenue
Schedule of Equity Method Investments [Line Items]
Gain (Loss) on Sale									$ (14,500)
Carrying value of investment in leasehold interest		$ 104,900									$ 235,400
Due from joint ventures | One Vanderbilt Avenue | National Pension Service of Korea / Hines Interest LP / Mori Building Co., Ltd
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold	5.00%			11.00%
Gross asset valuation	$ 4,700,000			$ 4,700,000
Gain (Loss) on Sale	$ 88,100,000			$ 187,600
Due from joint ventures | 625 Madison Avenue | Private Investor
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold		50.00%			90.43%
Gross asset valuation		$ 235,000			$ 634,600
Gain (Loss) on Sale		$ 0			$ (7,600)
Due from joint ventures | 85 Fifth Avenue | Private Investor
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold			36.27%
Gross asset valuation			$ 46,800
Gain (Loss) on Sale			$ (2,000,000)
Due from joint ventures | 717 Fifth Avenue | Wharton Properties
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold						10.92%
Gross asset valuation						$ 963,000
Gain (Loss) on Sale						$ 26,900
Due from joint ventures | 21 East 66th Street | Wharton Properties
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold							32.28%						32.28%
Gross asset valuation							$ 40,600						$ 40,600
Gain (Loss) on Sale							$ (12,700)
Due from joint ventures | 121 Greene Street | Wharton Properties
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold								50.00%
Gross asset valuation								$ 14,000
Gain (Loss) on Sale								$ (300)