Additional Contribution Of Property Fair Value

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- Definition

Amount Contributed On Maximum Contribution Required to Joint Venture by Co-Venture

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No definition available.

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- Definition

Business Acquisition, Percentage of Additional Voting Interests Acquired

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Business Combination, Additional Consideration Transferred

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No definition available.

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- Definition

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

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- Definition

Contribution Of Property, Fair Value

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No definition available.

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- Definition

Disposal Group, Transaction Costs On Sales Of Investments Real Estate

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- Definition

Join Venture Real Estate, Remaining Cash Distribution Percentage

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No definition available.

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- Definition

Joint Venture, Preferred Return On Capital

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No definition available.

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Joint Venture, Preferred Return On Capital, Percent Of Capital Contribution

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- Definition

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

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No definition available.

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Joint Venture, Preferred Unreturned On Capital, Percent Of Capital Contribution

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- Definition

Joint Venture Real Estate, Leased

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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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- Definition

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

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- Definition

Number Of Custom Home Sites

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Number of Hospitality Acquired

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Preferred Internal Rate Of Return On Capital Contribution

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Represents the percentage of preferred return on the capital of the entity.

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- Definition

Proceeds From Lease Agreement Per Square Foot On Annual Basis

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Amount of SID bonds transferred to a Joint Venture.

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Represents the amount of transaction value of land contributed to joint venture.

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

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Area of land held.

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Area of a real estate property.

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Value of property contributed in noncash investing and financing activities.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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This element represents the aggregate cost of investments accounted for under the equity method of accounting.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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- Definition

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

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Amount of investment in equity method investee and investment in and advance to affiliate.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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Investment in Real Estate and Other Affiliates (Narrative) (Details) usdPerAcre in Thousands							1 Months Ended				3 Months Ended					9 Months Ended		12 Months Ended
	Oct. 25, 2022 USD ($)	Aug. 18, 2022 USD ($)	Mar. 31, 2022 USD ($)	Mar. 30, 2022 USD ($)	Mar. 01, 2022 USD ($) hospitality	Jan. 19, 2021 a $ / ft²	Jul. 31, 2022 USD ($) a customHomeSite	Apr. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Oct. 31, 2021 USD ($) a	Sep. 30, 2022 USD ($) a ft²	Dec. 31, 2021 USD ($) a	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2015 USD ($) usdPerAcre	Sep. 30, 2022 USD ($) a ft²	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) a	Dec. 31, 2016	Dec. 31, 2015 ft²
Investments in and Advances to Affiliates [Line Items]
Total liabilities											$ 5,957,790,000	$ 5,848,524,000				$ 5,957,790,000		$ 5,848,524,000
Equity in earnings (losses) from real estate and other affiliates											7,708,000		$ (7,848,000)			19,528,000	$ 15,815,000
Impairment of investment in real estate and other affiliates											0		0			0	0
Carrying value											$ 7,125,228,000	7,033,244,000				7,125,228,000		7,033,244,000
Net loss attributable to noncontrolling interest													(1,595,000)			$ (407,000)	(4,296,000)
Over-Allotment Option
Investments in and Advances to Affiliates [Line Items]
Sale of stock, consideration received on transaction			$ 168,900,000					$ 22,100,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| 110 North Wacker
Investments in and Advances to Affiliates [Line Items]
Equity in earnings (losses) from real estate and other affiliates									$ 8,600,000
Consideration received				$ 208,600,000
Gain on disposal				5,000,000
Transaction costs on sales of investments real estate				17,600,000
Carrying value				195,000,000
Net loss attributable to noncontrolling interest				$ (400,000)
Floreo Development Holding Company, LLC
Investments in and Advances to Affiliates [Line Items]
Ownership interest																50.00%
Jean-Georges Restaurants
Investments in and Advances to Affiliates [Line Items]
Acquisition interest					25.00%
Purchase price					$ 45,000,000
Number of hospitality \| hospitality					40
Purchase price					$ 10,000,000
Additional interests acquired					20.00%
Floreo Development Holding Company, LLC
Investments in and Advances to Affiliates [Line Items]
Acquisition interest										50.00%	50.00%					50.00%
Purchase price										$ 59,000,000						$ 59,000,000
JDM Partners
Investments in and Advances to Affiliates [Line Items]
Acquisition interest											50.00%					50.00%
El Dorado Holdings
Investments in and Advances to Affiliates [Line Items]
Acquisition interest											50.00%					50.00%
Endorphin Ventures
Investments in and Advances to Affiliates [Line Items]
Proceeds from equity method investment, distribution, return of capital																$ 179,100,000
Discovery
Investments in and Advances to Affiliates [Line Items]
Proceeds from equity method investment, distribution, return of capital																27,000,000
Equity Method Investments
Investments in and Advances to Affiliates [Line Items]
Equity in earnings (losses) from real estate and other affiliates											$ 7,708,000		(7,848,000)			14,890,000	12,060,000
Equity method investment											$ 247,836,000	$ 365,997,000				$ 247,836,000		365,997,000
Seaport Segment
Investments in and Advances to Affiliates [Line Items]
Area of real estate property (in sqft) \| ft²											472,000					472,000
Seaport Segment \| The Tin Building by Jean-Georges
Investments in and Advances to Affiliates [Line Items]
Area of real estate property (in sqft) \| ft²																				53,783
Floreo Development Holding Company, LLC \| Subsequent Event
Investments in and Advances to Affiliates [Line Items]
Face amount	$ 165,000,000
Outstanding borrowings	57,500,000
Guarantee fee	$ 5,000,000
JDM Partners
Investments in and Advances to Affiliates [Line Items]
Ownership interest																42.50%
Purchase price		$ 10,000,000
El Dorado Holdings
Investments in and Advances to Affiliates [Line Items]
Ownership interest																7.50%
West End Alexandria
Investments in and Advances to Affiliates [Line Items]
Preferred internal rate of return on capital contribution												15.00%
110 North Wacker
Investments in and Advances to Affiliates [Line Items]
Impairment of investment in real estate and other affiliates																		17,700,000
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
The Lawn Club NYC, LLC
Investments in and Advances to Affiliates [Line Items]
Joint venture real estate, percentage funded						80.00%
Preferred return on capital of cash distribution						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]
Joint venture real estate, percentage funded						20.00%
Preferred return on capital of cash distribution						20.00%
Joint venture real estate, percentage funded, distribution						40.00%
Ssäm Bar
Investments in and Advances to Affiliates [Line Items]
Joint venture real estate, percentage funded																			89.75%
Preferred return on capital of cash distribution																75.00%
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]
Joint venture real estate, percentage funded																			10.25%
Preferred return on capital of cash distribution																25.00%
Ssäm Bar \| Seaport Segment \| Equity Method Investments
Investments in and Advances to Affiliates [Line Items]
Equity in earnings (losses) from real estate and other affiliates											$ (216,000)		(1,009,000)			$ (473,000)	(1,697,000)
Investment in real estate and other affiliates											5,700,000					5,700,000
Equity method investment											5,661,000	$ 5,852,000				$ 5,661,000		5,852,000
The Tin Building by Jean-Georges
Investments in and Advances to Affiliates [Line Items]
Joint venture real estate, percentage funded																100.00%
Preferred return on capital of cash distribution																65.00%
Joint venture real estate, percentage funded, distribution																100.00%
Ownership interest																100.00%
Joint venture real estate, leased																100.00%
Preferred return on capital																18.00%
The Tin Building by Jean-Georges \| Jean-Georges Restaurants
Investments in and Advances to Affiliates [Line Items]
Preferred return on capital of cash distribution																35.00%
The Tin Building by Jean-Georges \| Seaport Segment \| Equity Method Investments
Investments in and Advances to Affiliates [Line Items]
Equity in earnings (losses) from real estate and other affiliates											(11,366,000)		0			$ (20,565,000)	0
Equity method investment											3,730,000	0				3,730,000		0
Contributions cost											24,300,000					24,300,000
Jean-Georges Restaurants \| Seaport Segment \| Equity Method Investments
Investments in and Advances to Affiliates [Line Items]
Equity in earnings (losses) from real estate and other affiliates											309,000		0			815,000	0
Equity method investment											$ 46,215,000	$ 0				$ 46,215,000		$ 0
Economic/Legal Ownership					25.00%						25.00%	0.00%				25.00%		0.00%
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]
Equity in earnings (losses) from real estate and other affiliates							$ 13,500,000
Join venture real estate, remaining cash distribution percentage							50.00%
Preferred return on capital							5.00%
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															$ 3,800,000
Area of land \| a							54
Fair value of property contributed							$ 21,500,000
Number of custom home sites \| customHomeSite							28
The Summit \| Equity Method Investments \| HHC
Investments in and Advances to Affiliates [Line Items]
Economic/Legal Ownership							40.00%
The Summit \| Discovery \| Equity Method Investments
Investments in and Advances to Affiliates [Line Items]
Proceeds from equity method investment, distribution, return of capital							$ 32,000,000
Economic/Legal Ownership							60.00%
Foulger Pratt Development, LLC
Investments in and Advances to Affiliates [Line Items]
Economic/Legal Ownership												100.00%						100.00%
West End Alexandria
Investments in and Advances to Affiliates [Line Items]
Preferred return on capital												10.00%
Economic/Legal Ownership												58.33%						58.33%
Preferred return on capital, percent of capital contribution												100.00%
West End Alexandria \| Strategic Developments Segment \| Equity Method Investments
Investments in and Advances to Affiliates [Line Items]
Equity in earnings (losses) from real estate and other affiliates											$ 5,000		$ 0			67,000	$ 0
Equity method investment											$ 56,613,000	$ 56,546,000				$ 56,613,000		$ 56,546,000
West End Alexandria \| Foulger Pratt Development, LLC
Investments in and Advances to Affiliates [Line Items]
Economic/Legal Ownership												10.42%						10.42%
Preferred return on capital, percent of capital contribution												20.00%
Preferred unreturned on capital, percent of capital contribution												30.00%
West End Alexandria \| Seritage
Investments in and Advances to Affiliates [Line Items]
Economic/Legal Ownership												31.25%						31.25%
West End Alexandria \| West End Alexandria
Investments in and Advances to Affiliates [Line Items]
Preferred return on capital, percent of capital contribution												80.00%
Preferred unreturned on capital, percent of capital contribution												70.00%
Fulton Market Building
Investments in and Advances to Affiliates [Line Items]
Area of real estate property (in sqft) \| a						20,000
Phoenix, Arizona \| Floreo Development Holding Company, LLC
Investments in and Advances to Affiliates [Line Items]
Area of land \| a										3,029
Phoenix, Arizona \| Floreo Development Holding Company, LLC
Investments in and Advances to Affiliates [Line Items]
Area of land \| a											3,029					3,029
Phoenix, Arizona \| JDM Partners
Investments in and Advances to Affiliates [Line Items]
Area of land \| a											2,579					2,579
Phoenix, Arizona \| El Dorado Holdings
Investments in and Advances to Affiliates [Line Items]
Area of land \| a											450					450
Landmark Mall Property \| Foulger Pratt Development, LLC
Investments in and Advances to Affiliates [Line Items]
Area of land \| a												33						33
Fair value of property contributed												$ 56,000,000
Fair value of property contributed, additional												$ 10,000,000
Landmark Mall Property \| Seritage
Investments in and Advances to Affiliates [Line Items]
Area of land \| a												19						19
Fair value of property contributed												$ 30,000,000
Alexandria \| West End Alexandria
Investments in and Advances to Affiliates [Line Items]
Carrying value												$ 54,000,000						$ 54,000,000
Area of land \| a												11						11
Central Plaza \| Development Plans
Investments in and Advances to Affiliates [Line Items]
Area of real estate property (in sqft) \| a												4,000,000						4,000,000
Area of land \| a												41						41
Unconsolidated Properties
Investments in and Advances to Affiliates [Line Items]
Total liabilities											$ 209,700,000					$ 209,700,000
Unconsolidated Properties \| HHC \| Equity Method Investment, Nonconsolidated Investee or Group of Investees
Investments in and Advances to Affiliates [Line Items]
Total liabilities											$ 105,200,000					$ 105,200,000