Financing Activity - Credit Agreements (Details)								3 Months Ended	12 Months Ended
	Oct. 01, 2021	Jun. 30, 2021	Feb. 08, 2021 USD ($)	Dec. 10, 2020 USD ($)	Oct. 31, 2020 USD ($)	Oct. 16, 2020 USD ($)	Jul. 27, 2020	Sep. 30, 2021	Dec. 31, 2021 USD ($) ft² Property Award	Dec. 31, 2020 USD ($)	Nov. 01, 2020 USD ($)
Debt Instrument [Line Items]
Outstanding line of credit									$ 54,549,000	$ 54,830,000
Deferred financing costs									1,125,000	14,072,000
Gain (loss) on debt extinguishment, net									4,587,000	(1,487,000)
Amounts equal to greater than termination or modification of lease									2,500,000
Cash and cash equivalents									43,852,000	$ 43,309,000
Maximum
Debt Instrument [Line Items]
Amounts received on behalf of guarantor in consideration of termination or modification of lease.									$ 3,500,000
Minimum
Debt Instrument [Line Items]
Leased premises | ft²									7,500
Debt instrument discounted amount									$ 750,000
Percentage of aggregate contractual base rent									25.00%
Outstanding obligations									$ 3,500,000
Unsecured Debt
Debt Instrument [Line Items]
Debt issuance costs, line of credit arrangements									$ 6,500,000
First Lien Credit Agreement Base Rate Loans | Federal Funds Rate
Debt Instrument [Line Items]
Debt, variable interest rate									0.50%
First Lien Credit Agreement Base Rate Loans | LIBOR Market Index Rate
Debt Instrument [Line Items]
Debt, variable interest rate									1.00%
First Lien Credit Agreement Base Rate Loans | Base Rate
Debt Instrument [Line Items]
Debt, variable interest rate									1.50%
Second Lien Credit Agreement Base Rate Loan | Federal Funds Rate
Debt Instrument [Line Items]
Debt, variable interest rate									0.50%
Second Lien Credit Agreement Base Rate Loan | LIBOR Market Index Rate
Debt Instrument [Line Items]
Debt, variable interest rate									1.00%
Second Lien Credit Agreement Base Rate Loan | Base Rate
Debt Instrument [Line Items]
Debt, variable interest rate									1.50%
Debt instrument interest rate									7.00%
Second Lien Credit Agreement LIBOR Loans | Maximum
Debt Instrument [Line Items]
Debt, variable interest rate									0.50%
Second Lien Credit Agreement LIBOR Loans | LIBOR
Debt Instrument [Line Items]
Debt, variable interest rate									8.00%
Bridge Facility
Debt Instrument [Line Items]
Number of properties | Property									12
Number of malls | Property									9
Number of additional parcels | Property									3
Debt instrument, maturity date									Oct. 31, 2020
Prepayment percentage of net cash proceeds from certain capital events									100.00%
Unused commitments fee percentage									0.50%
Bridge Facility | Maximum
Debt Instrument [Line Items]
Unrestricted cash liquidity									$ 12,500,000
Bridge Facility Base Rate Loans
Debt Instrument [Line Items]
Debt instrument interest rate									7.00%
Bridge Facility Base Rate Loans | Federal Funds Rate
Debt Instrument [Line Items]
Debt, variable interest rate									0.50%
Bridge Facility Base Rate Loans | LIBOR Market Index Rate
Debt Instrument [Line Items]
Debt, variable interest rate									1.00%
Bridge Facility Base Rate Loans | Base Rate | Minimum
Debt Instrument [Line Items]
Debt, variable interest rate									2.00%
Bridge Facility L I B O R Loans | LIBOR
Debt Instrument [Line Items]
Debt, variable interest rate									8.00%
Credit Agreements
Debt Instrument [Line Items]
Number of credit agreements | Award									3
Debt instrument maturity period									2022-12
Debt instrument, payment terms									2 years
Number of properties | Property									12
Number of malls | Property									9
Number of additional parcels | Property									3
Debt instrument extension term									1 year
Debt instrument extended maturity period										2023-12
Debt instrument minimum liquidity									$ 35,000,000.0
Percentage of minimum corporate debt yield	7.25%							6.50%	8.00%
Percentage of maximum loan to value ratio									105.00%
Debt Instrument, restrictive covenants									The Credit Agreements each provide for a two-year maturity of December 2022 (the “Maturity Date”), subject to a one-year extension to December 2023 at the borrowers’ option, subject to (i) minimum liquidity of $35.0 million, (ii) a minimum corporate debt yield of 8.0%, (iii) a maximum loan-to-value ratio of 105% for the total first lien and second lien loans and letters of credit and the Borrowing Base Properties as determined by an appraisal and (iv) no default or event of default existing and our representations and warranties being true in all material respects. The loans under the Credit Agreements are repayable in full on the Maturity Date, subject to mandatory prepayment provisions in the event of certain events including asset sales, incurrence of indebtedness, issuances of equity and receipt of casualty insurance proceeds. The terms of our Credit Agreements place restrictions on, among other things, and subject to certain exceptions, our ability to make certain restricted payments (including payments of dividends), make certain types of investments and acquisitions, issue redeemable securities, incur additional indebtedness, incur liens on our assets, enter into agreements with a negative pledge, make certain intercompany transfers, merge, consolidate, or sell our assets or the equity interests in our subsidiaries, amend our organizational documents or material contracts, enter into certain transactions with affiliates, or enter into derivatives contracts. Additionally, if we receive net cash proceeds from certain capital events (including equity issuances), we are required to prepay loans under our Credit Agreements. In addition, the Credit Agreements contain cross-default provisions that trigger an event of default if we fail to make certain payments or otherwise fail to comply with our obligations with respect to certain of our other indebtedness, including obligations under the FDP Loan Agreement.
Interest and debt expense					$ 5,600,000				$ 26,800,000
Reorganization expense									3,800,000
Deferred financing costs									14,100,000
Gain (loss) on debt extinguishment, net										$ 900,000
Accelerated financing fee										600,000
Minimum liquidity comprised of unrestricted cash held in certain deposit accounts subject to control agreements									25,000,000.0
Maximum certain other deposit account not subject to control agreement									5,000,000.0
Percentage of minimum senior debt yield		11.35%
Maximum cash not retain in property level accounts held by subsidiaries									$ 6,500,000
Required Percentage of net proceeds from debt issuance to outstanding debt for voluntary and mandatory prepayment of debt									100.00%
Required percentage of net proceeds from equity issuance to outstanding debt for voluntary and mandatory prepayment of debt									50.00%
Required percentage of net other proceeds along with proceeds equity issuance to outstanding debt for voluntary and mandatory prepayment of debt									50.00%
Required percentage of net proceeds from asset disposition to outstanding debt for voluntary and mandatory prepayment of debt or designated collateral proceeds account									70.00%
Required percentage of net other proceeds along with asset disposition to outstanding debt for voluntary and mandatory prepayment of debt									30.00%
Required percentage of net proceeds from insurance to outstanding debt for voluntary and mandatory prepayment of debt									100.00%
Required percentage of net proceeds from sale of property to sale value for voluntary and mandatory prepayment of debt									100.00%
Required percentage of property appraisal to property value for voluntary and mandatory prepayment of debt									110.00%
Required percentage of net proceeds from non-income producing parcel for voluntary and mandatory prepayment of debt or designated collateral proceeds account									100.00%
Required percentage of net proceeds from non-income producing parcel for voluntary and mandatory prepayment of debt description									in the event a non-income producing parcel is released, 70% of net cash proceeds (with the other 30% required to either (i) prepay loans (under the First Lien Credit Agreement, the revolving loans) or (ii) be deposited into a designated collateral proceeds account)
Percentage of remaining cash proceeds to be used for second lien in excess of first lien credit									100.00%
Maximum senior debt yield percentage for prepayment of debt									12.06%
Maximum liquidity to request for disbursement of funds in collateral									$ 12,500,000
Mandatory repayment of debt in event of minimum requirement of unrestricted cash or cash equivalents exceeds									40,000,000.0
Minimum amount of indebtedness to consider failure to pay									25,000,000.0
Minimum amount of non-recourse indebtedness to consider failure to pay									$ 250,000,000.0
Credit Agreements | Property With Average Sales Of More Than $500 Per Square Foot
Debt Instrument [Line Items]
Covenant compliance, capitalization rate									6.50%
Credit Agreements | Property Other Than With Average Sales Of $500 Per Square Foot
Debt Instrument [Line Items]
Covenant compliance, capitalization rate									7.50%
Credit Agreements | Guarantor Subsidiaries or Non-Guarantor Subsidiaries
Debt Instrument [Line Items]
Required Percentage of net proceeds from debt issuance to outstanding debt for voluntary and mandatory prepayment of debt									100.00%
Required percentage of net proceeds from equity issuance to outstanding debt for voluntary and mandatory prepayment of debt									50.00%
Required percentage of net proceeds from asset disposition to outstanding debt for voluntary and mandatory prepayment of debt or designated collateral proceeds account									70.00%
Required percentage of net proceeds from insurance to outstanding debt for voluntary and mandatory prepayment of debt									100.00%
Credit Agreements | General and Administrative Expense
Debt Instrument [Line Items]
Deferred financing costs										$ 8,000,000.0
Credit Agreements | First Lien Revolving Facility
Debt Instrument [Line Items]
Outstanding line of credit									$ 54,500,000
Remaining borrowing capacity									$ 75,500,000
Credit Agreements | Term Loans
Debt Instrument [Line Items]
Debt instrument, payment terms									7 years	7 years
Outstanding borrowings									$ 965,700,000		$ 590,000,000.0
Long-term debt									965,700,000		590,000,000.0
Principal amortization payments									909,000
Credit Agreements | 2018 Revolving Facility
Debt Instrument [Line Items]
Maximum borrowing									$ 375,000,000.0
Debt instrument, payment terms									7 years
Outstanding line of credit											375,000,000.0
Facility fee percentage							0.35%
Prepayment percentage of net cash proceeds from certain capital events									54.55%
Applicable percentage repayment of outstanding amount provided net proceeds from capital exceeds one fifty million									50.00%
Remaining percentage repayment of outstanding amount provided net proceeds from capital exceeds one fifty million									50.00%
Remaining percentage of net cash proceeds from certain capital events									45.45%
Credit agreement, frequency of periodic payment									monthly
Principal amortization payments									$ 1,090,000.00
Credit Agreements | 2018 Revolving Facility | Minimum
Debt Instrument [Line Items]
Net cash proceeds from capital events									150,000,000
Cash and cash equivalents									50,000,000.0
Credit Agreements | A2018 Term Loan Facility
Debt Instrument [Line Items]
Maximum borrowing									300,000,000.0
Credit Agreements | A2014 Seven Year Term Loan
Debt Instrument [Line Items]
Maximum borrowing									250,000,000.0
Credit Agreements | Bridge Facility
Debt Instrument [Line Items]
Maximum borrowing									$ 30,000,000.0
Outstanding line of credit											$ 55,000,000.0
Debt instrument, maturity date									Oct. 31, 2020
Ability request additional commitment amount									$ 25,000,000.0
Increase in aggregate amount of commitments						$ 25,000,000.0			25,000,000.0
Proceeds from line of credit									$ 25,000,000.0
Secured First Lien Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing				$ 130,000,000.0
Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing				10,000,000.0
First Lien Term Loan Facility
Debt Instrument [Line Items]
Maximum borrowing				384,500,000
Second Lien Term Loan Facility
Debt Instrument [Line Items]
Maximum borrowing				$ 535,200,000
Bridge Credit Agreement
Debt Instrument [Line Items]
Loan agreement entered date				Aug. 11, 2020
7-Year Term Loan
Debt Instrument [Line Items]
Loan agreement entered date				Jan. 08, 2014
Debt instrument, payment terms				7 years
Two Thousand Eighteen Amended And Restated Credit Agreement
Debt Instrument [Line Items]
Loan agreement entered date				May 24, 2018
2018 Credit Agreement
Debt Instrument [Line Items]
Debt instrument, payment terms				7 years
Revolving Loans
Debt Instrument [Line Items]
Debt, variable interest rate									2.50%
Revolving Loans | LIBOR
Debt Instrument [Line Items]
Debt, variable interest rate									3.50%
First Lien Credit Agreement
Debt Instrument [Line Items]
Days of interest period									30 days
Percentage of amount greater than equal to 50% of aggregate amount of revolving commitments									0.35%
Percentage of daily amount of unused revolving commitments									50.00%
Percentage of amount less than 50% of aggregate amount of revolving commitments									0.25%
Debt instrument, variable rate description									Amounts borrowed under the First Lien Credit Agreement may be either Base Rate Loans or LIBOR Loans. Base Rate Loans bear interest at the highest of (a) the Prime Rate, (b) the Federal Funds Rate plus 0.50% and (c) the LIBOR Market Index Rate plus 1.0%, provided that the Base Rate will not be less than 1.50% per annum, in each case plus (w) for revolving loans, 2.50% per annum, and (x) for term loans, 4.74% per annum. LIBOR Loans bear interest at LIBOR plus (y) for revolving loans, 3.50% per annum, and (z) for term loans, 5.74% per annum, in each case, provided that LIBOR will not be less than 0.50% per annum. Interest is due to be paid in cash on the last day of each applicable interest period (with rolling 30-day interest periods) and on the Maturity Date. We are required to pay certain fees to the administrative agent for the account of the lenders in connection with the First Lien Credit Agreement, including an unused fee for the account of the revolving lenders, which will accrue (i) 0.35% per annum on the daily amount of the unused revolving commitments when that amount is greater than or equal to 50% of the aggregate amount of revolving commitments, and (ii) 0.25% when that amount is less than 50% of the aggregate amount of revolving commitments. Accrued and unpaid unused fees will be payable quarterly in arrears during the term of the First Lien Credit Agreement and on the Revolving Termination Date (or any earlier date of termination of the revolving commitments or reduction of the revolving commitments to zero).
First Lien Credit Agreement | LIBOR | Maximum
Debt Instrument [Line Items]
Debt, variable interest rate									0.50%
First Lien Credit Agreement | Term Loans
Debt Instrument [Line Items]
Debt, variable interest rate									4.74%
First Lien Credit Agreement | Term Loans | LIBOR
Debt Instrument [Line Items]
Debt, variable interest rate									5.74%
Second Lien Credit Agreement
Debt Instrument [Line Items]
Debt instrument, payment terms									7 years
Days of interest period									30 days
Debt instrument, variable rate description									Amounts borrowed under the Second Lien Credit Agreement may be either Base Rate Loans or LIBOR Loans. Base Rate Loans bear interest at the highest of (a) the Prime Rate, (b) the Federal Funds Rate plus 0.50% and (c) the LIBOR Market Index Rate plus 1.0%, provided that the Base Rate will not be less than 1.50% per annum, in each case plus 7.00% per annum. LIBOR Loans bear interest at LIBOR plus 8.00% per annum, provided that LIBOR will not be less than 0.50% per annum. Interest is due to be paid in kind on the last day of each applicable interest period (with rolling 30-day interest periods) by adding the accrued and unpaid amount thereof to the principal balance of the loans under the Second Lien Credit Agreement and then accruing interest on the increased principal amount (provided that after the discharge of our Senior Debt Obligations, interest will be paid in cash). We are required to pay certain fees to the administrative agent for the account of the lenders in connection with the Second Lien Credit Agreement.
First Amendment
Debt Instrument [Line Items]
Debt instrument waiver of default interest			$ 5,300,000
Principal amount of loans outstanding				$ 535,200,000