Impairment - Summary of Impairments (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Impaired Long-Lived Assets Held and Used [Line Items]
Provision for impairment		$ 672,492	$ 0	$ 13,068
Total Seaport		0	0	30,741
110 North Wacker
Impaired Long-Lived Assets Held and Used [Line Items]
Investments in unconsolidated ventures		0	0	17,673
Seaport Segment
Impaired Long-Lived Assets Held and Used [Line Items]
Provision for impairment		672,492	0	0
Investments in unconsolidated ventures		37,001	0	0
Total Seaport	$ 709,500	709,493	0	0
Seaport Segment | Buildings and equipment
Impaired Long-Lived Assets Held and Used [Line Items]
Provision for impairment		445,818	0	0
Seaport Segment | Land
Impaired Long-Lived Assets Held and Used [Line Items]
Provision for impairment		11,734	0	0
Seaport Segment | Developments
Impaired Long-Lived Assets Held and Used [Line Items]
Provision for impairment		214,940	0	0
Century Park
Impaired Long-Lived Assets Held and Used [Line Items]
Provision for impairment		$ 0	$ 0	$ 13,068