Mortgage and Other Indebtedness, Net- Schedule of Pre-Emergence Principal Payments (Details) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2021 USD ($) loan	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
2021	$ 41,365
2022	409,394
2023	1,566,756
2024	343,177
2025	37,960
2026	763,626
Total	3,162,278
Mortgage and other indebtedness, net	1,019,084	$ 1,184,831
Liabilities subject to compromise	$ 2,489,676
Weighted-average remaining term to maturity	2 years 3 months 18 days	3 years
Greenbrier Mall
Debt Instrument [Line Items]
Mortgage and other indebtedness, net	$ 61,647
Debt instrument, maturity date	Dec. 31, 2019
Parkdale Mall & Crossing
Debt Instrument [Line Items]
Mortgage and other indebtedness, net	$ 70,507
Debt instrument, maturity date	Mar. 31, 2021
EastGate Mall
Debt Instrument [Line Items]
Mortgage and other indebtedness, net	$ 30,117
Debt instrument, maturity date	Apr. 30, 2021
Hamilton Crossing
Debt Instrument [Line Items]
Mortgage and other indebtedness, net	$ 7,954
Debt instrument, maturity date	Apr. 30, 2021
Fayette Mall
Debt Instrument [Line Items]
Mortgage and other indebtedness, net	$ 136,670
Debt instrument, maturity date	May 31, 2021
Alamance Crossing
Debt Instrument [Line Items]
Mortgage and other indebtedness, net	$ 42,789
Debt instrument, maturity date	Jul. 31, 2021
Mortgages
Debt Instrument [Line Items]
Mortgage and other indebtedness, net	$ 3,511,962
Operating Property Loan
Debt Instrument [Line Items]
2021	$ 27,461
Number of operating property loans (loan) \| loan	1
Operating Property Loan \| Mortgages
Debt Instrument [Line Items]
Mortgage and other indebtedness, net	$ 349,684

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