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Capital contributed to joint venture to purchase a property.

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Represents information pertaining to entitlement of distribution by joint venture after receipt of capital contribution and preferred returns.

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Contribution Of Property, Fair Value

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Join Venture Real Estate, Remaining Cash Distribution Percentage

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Joint Venture, Preferred Return On Capital

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Joint Venture, Preferred Return On Capital, Percent Of Cash Distributions

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Joint Venture Real Estate, Ownership Percentage

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Joint Venture Real Estate, Percentage Funded

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Joint Venture Real Estate, Percentage Funded, Distribution

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Represents the maximum capital contribution required by the partner in a joint venture.

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Proceeds From Lease Agreement Per Square Foot On Annual Basis

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Real Estate Affiliates carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Amount of SID bonds transferred to a Joint Venture.

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The per acre value of the land contributed to a joint venture.

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Area of a real estate property.

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Value of property contributed in noncash investing and financing activities.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Real Estate and Other Affiliates (Narrative) (Details) usdPerAcre in Thousands, ft² in Thousands				3 Months Ended					9 Months Ended
	Sep. 16, 2021 $ / ft²	Jan. 19, 2021 a	May 23, 2019 USD ($)	Sep. 30, 2021 USD ($) ft²	Sep. 30, 2020 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2016	Mar. 31, 2015 USD ($) usdPerAcre	Sep. 30, 2021 USD ($) ft²	Sep. 30, 2020 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2020 USD ($)
Investments in and Advances to Affiliates [Line Items]
Equity in earnings (losses) from real estate and other affiliates				$ (7,848,000)	$ 266,838,000				$ 15,815,000	$ 269,635,000
Equity Method Investments
Investments in and Advances to Affiliates [Line Items]
Equity method investment				277,891,000					277,891,000			$ 373,192,000
Equity in earnings (losses) from real estate and other affiliates				(7,848,000)	266,838,000				12,060,000	265,911,000
Other land, rental and property revenues
Investments in and Advances to Affiliates [Line Items]
Revenues from contracts with customers				$ 56,350,000	35,748,000				$ 120,982,000	82,092,000
Seaport Segment
Investments in and Advances to Affiliates [Line Items]
Area of real estate property (in sqft) \| ft²				453					453
HHC
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage				50.00%					50.00%
Discovery
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage				50.00%					50.00%
USAA Joint Venture
Investments in and Advances to Affiliates [Line Items]
Contribution of property						$ 33,600,000
Fair value of property contributed						$ 85,000,000
Capital contribution to joint venture											$ 9,800,000
Preferred return on capital						9.00%
Ownership interest									90.00%
USAA Joint Venture \| Local Developer
Investments in and Advances to Affiliates [Line Items]
Capital contribution to joint venture						$ 5,000,000					$ 1,100,000
USAA Joint Venture \| USAA
Investments in and Advances to Affiliates [Line Items]
Capital contribution to joint venture			$ 178,400,000			64,000,000
Joint venture capital obligations			$ 8,800,000			$ 105,600,000
Preferred return on capital						9.00%
Preferred return on capital of cash distribution						11.11%
Ownership interest									10.00%
110 North Wacker
Investments in and Advances to Affiliates [Line Items]
Equity method investment					273,600,000					273,600,000
110 North Wacker \| Strategic Developments Segment
Investments in and Advances to Affiliates [Line Items]
Equity in earnings (losses) from real estate and other affiliates					267,500,000
110 North Wacker \| Strategic Developments Segment \| Equity Method Investments
Investments in and Advances to Affiliates [Line Items]
Equity method investment				$ 0					$ 0			0
Equity in earnings (losses) from real estate and other affiliates				0	267,518,000				$ 0	267,518,000
110 North Wacker \| Strategic Developments Segment \| Other land, rental and property revenues \| Equity Method Investments
Investments in and Advances to Affiliates [Line Items]
Revenues from contracts with customers					15,400,000
Ssäm Bar
Investments in and Advances to Affiliates [Line Items]
Preferred return on capital of cash distribution									75.00%
Joint venture real estate, percentage funded							89.75%
Preferred return on capital									10.00%
Join venture real estate, remaining cash distribution percentage									50.00%
Ssäm Bar \| Momofuku
Investments in and Advances to Affiliates [Line Items]
Preferred return on capital of cash distribution									25.00%
Joint venture real estate, percentage funded							10.25%
Ssäm Bar \| Seaport Segment \| Equity Method Investments
Investments in and Advances to Affiliates [Line Items]
Equity method investment				6,142,000					$ 6,142,000			$ 7,101,000
Equity in earnings (losses) from real estate and other affiliates				(1,009,000)	$ (288,000)				(1,697,000)	$ (2,064,000)
Investment in real estate and other affiliates				6,100,000					$ 6,100,000
The Summit
Investments in and Advances to Affiliates [Line Items]
Preferred return on capital									5.00%
Cash distribution entitlement by the joint venture									2
The Summit \| Equity Method Investments
Investments in and Advances to Affiliates [Line Items]
Contribution of property								$ 13,400,000
SID bonds transferred to joint venture								1,300,000
Transaction value of land contributed to joint venture								$ 125,400,000	$ 125,400,000
Transactional value per acre of land contributed to joint venture \| usdPerAcre								226
Maximum contribution required to joint venture by co-venturer								$ 30,000,000
Amount contributed on maximum contribution required to joint venture by co-venture								$ 3,750,000
The Lawn Club NYC, LLC
Investments in and Advances to Affiliates [Line Items]
Preferred return on capital of cash distribution	80.00%
Joint venture real estate, percentage funded		80.00%
Joint venture real estate, percentage funded, distribution	60.00%
Lease agreement equal per square foot of the property on an annual basis (per sq ft) \| $ / ft²	100
The Lawn Club NYC, LLC \| Endorphin Ventures
Investments in and Advances to Affiliates [Line Items]
Preferred return on capital of cash distribution	20.00%
Joint venture real estate, percentage funded		20.00%
Joint venture real estate, percentage funded, distribution	40.00%
110 North Wacker
Investments in and Advances to Affiliates [Line Items]
Recourse amount				100,600,000					100,600,000
Fulton Market Building
Investments in and Advances to Affiliates [Line Items]
Area of real estate property (in sqft) \| a		20,000
Unconsolidated Properties
Investments in and Advances to Affiliates [Line Items]
Secured debt real estate affiliates				634,500,000					634,500,000
Share of entity in secured debt				$ 292,800,000					$ 292,800,000