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Investments in Unconsolidated Joint Ventures - Narrative (Details)	Oct. 26, 2021 USD ($)	Mar. 29, 2021 USD ($)	Dec. 29, 2020 USD ($)	Dec. 10, 2020 USD ($)	Nov. 17, 2020 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($) property	Dec. 28, 2020	Dec. 09, 2020 USD ($)
Schedule of Equity Method Investments
Mortgage notes payable						$ 4,432,587,000	$ 4,560,810,000
Sears South Plains
Schedule of Equity Method Investments
Ownership percentage at completion of acquisition (as a percent)							100.00%
Tysons Corner LLC
Schedule of Equity Method Investments
Loan funding					$ 45,000,000
Fashion District Philadelphia
Schedule of Equity Method Investments
Effective interest rate (in percent)						4.00%
FlatIron Crossing
Schedule of Equity Method Investments
Repayments of debt			$ 7,650,000
Joint Venture
Schedule of Equity Method Investments
Number of properties | property							9
Joint Venture | Fashion District Philadelphia
Schedule of Equity Method Investments
Extension term				1 year
Joint Venture | Fashion District Philadelphia | LIBOR
Schedule of Equity Method Investments
Variable interest rate spread (in percent)				3.50%
Joint Venture | Fashion District Philadelphia | LIBOR floor
Schedule of Equity Method Investments
Variable interest rate spread (in percent)				0.50%
Joint Venture | Fashion District Philadelphia
Schedule of Equity Method Investments
Mortgage notes payable				$ 201,000					$ 301,000
Repayments of debt				$ 100,000
Accrued interest percent to be repaid prior to cash distributions				15.00%
Joint Venture | Tysons Corner LLC
Schedule of Equity Method Investments
Mortgage notes payable					$ 95,000,000
Effective interest rate (in percent)					3.43%
Loan funding					$ 90,000,000
Joint Venture | Tysons Corner LLC | Future advance potential
Schedule of Equity Method Investments
Loan funding					$ 5,000
Joint Venture | Fashion District Philadelphia
Schedule of Equity Method Investments
Cash distribution, percent				50.00%
Joint Venture | FlatIron Crossing
Schedule of Equity Method Investments
Repayments of debt			$ 15,000
Extension term			1 year
Interest rate on debt			4.10%					3.85%
Joint Venture | Paradise Valley Mall
Schedule of Equity Method Investments
Ownership percentage		5.00%
Payments for joint venture		$ 3,819,000
Joint Venture | The Shops At Atlas Park | Subsequent event
Schedule of Equity Method Investments
Face amount on debt	$ 65,000,000
Joint Venture | The Shops At Atlas Park | LIBOR | Subsequent event
Schedule of Equity Method Investments
Variable interest rate spread (in percent)	4.15%
Joint venture partner | Fashion District Philadelphia
Schedule of Equity Method Investments
Cash distribution, percent				50.00%

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