Investments in Unconsolidated Ventures - Tin Building by Jean-Georges (Details) a in Thousands, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024 USD ($) a	Dec. 31, 2023 USD ($)	Mar. 31, 2022	Dec. 31, 2015 ft²
Jean-Georges Restaurants
Schedule of Investments [Line Items]
Acquisition interest			25.00%
Seaport Segment
Schedule of Investments [Line Items]
Area of real estate property (in sqft) | a	472
Tin Building by Jean-Georges
Schedule of Investments [Line Items]
Ownership interest	100.00%
Joint venture real estate, leased	100.00%
Joint venture real estate, percentage funded	100.00%
Tin Building by Jean-Georges | Seaport Segment
Schedule of Investments [Line Items]
Area of real estate property (in sqft) | ft²				53,783
Equity Method Investments	$ 13.6
Contributions made by the company	$ 11.6	$ 48.1