Mortgage and Other Indebtedness, Net - Narrative (Details)	9 Months Ended
	Sep. 30, 2021 USD ($) mall associated_center subsidiary mortgage_note_receivable loan	Mar. 31, 2020 USD ($)
Debt Instrument [Line Items]
Number of Malls Securing Credit Facility, Collateral | mall	17
Number of Associated Centers Securing Credit Facility, Collateral | associated_center	3
Number of wholly owned subsidiaries | subsidiary	36
Line of credit facility payment restrictions	150,000
Number of non-recourse loans | loan	2
Loans in default, aggregate outstanding balance	$ 727,603,000
Deconsolidation of secured loans amount	$ 138,926,000
Guarantor Subsidiaries
Debt Instrument [Line Items]
Number of malls not classified as collateral for the secured credit facility | mall	4
Number of associated centers not classified as collateral for the secured credit facility | associated_center	2
Number of Mortgage Notes Receivable not Classified as Collateral | mortgage_note_receivable	4
COVID-19
Debt Instrument [Line Items]
Secured credit facility, impact of uncertainty		$ 280,000,000
Line of Credit | Secured Debt
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,185,000,000
Revolving Credit Facility | Secured Debt
Debt Instrument [Line Items]
Debt Instrument, Face Amount	675,926,000
Secured Term Loan | Secured Debt
Debt Instrument [Line Items]
Debt Instrument, Face Amount	438,750,000
Non-Recourse Loans on Operating Properties
Debt Instrument [Line Items]
Debt default threshold, minimum loan amount (greater than)	$ 50,000