Mortgage and Other Indebtedness, Net - Pre-Emergence Debt of Operating Partnership (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Mortgage notes payable	$ 955,175	$ 1,120,203
Mortgage and other indebtedness, variable-rate debt	67,111	68,061
Total fixed-rate and variable-rate debt	1,022,286	1,188,264
Unamortized deferred financing costs	(3,202)	(3,433)
Total mortgage and other indebtedness, net	$ 1,019,084	$ 1,184,831
Weighted average interest rate (as a percent)	4.95%	5.10%
Mortgage notes payable subject to compromise	$ 1,375,000	$ 1,375,000
Mortgage and other indebtedness, variable-rate debt, subject to compromise	1,114,676	1,114,676
Total fixed-rate and variable-rate debt	2,489,676	2,489,676
Unpaid accrued interest	57,644	57,644
Total liabilities subject to compromise	$ 2,551,686	$ 2,551,490
Weighted average interest rate subject to compromise (as a percent)	7.25%	7.25%
Senior Secured Facility
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	5.00%
Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	5.07%	5.12%
Weighted average interest rate subject to compromise (as a percent)	5.43%	5.43%
Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	3.19%	4.69%
Weighted average interest rate subject to compromise (as a percent)	9.50%	9.50%
Post-Default Rate | Senior Secured Facility
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	9.50%	9.50%
Non-Recourse Loans on Operating Properties
Debt Instrument [Line Items]
Mortgage notes payable	$ 955,175	$ 1,120,203
Non-Recourse Loans on Operating Properties | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	5.07%	5.12%
Recourse Loans on Operating Properties
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt	$ 67,111	$ 68,061
Recourse Loans on Operating Properties | Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	3.19%	4.69%
Senior Unsecured Notes Due 2023
Debt Instrument [Line Items]
Mortgage notes payable subject to compromise	$ 450,000	$ 450,000
Senior Unsecured Notes Due 2023 | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate subject to compromise (as a percent)	5.25%	5.25%
Senior Unsecured Notes Due 2024
Debt Instrument [Line Items]
Mortgage notes payable subject to compromise	$ 300,000	$ 300,000
Senior Unsecured Notes Due 2024 | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate subject to compromise (as a percent)	4.60%	4.60%
Senior Unsecured Notes Due 2026
Debt Instrument [Line Items]
Mortgage notes payable subject to compromise	$ 625,000	$ 625,000
Senior Unsecured Notes Due 2026 | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate subject to compromise (as a percent)	5.95%	5.95%
Secured Line of Credit
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt, subject to compromise	$ 675,926	$ 675,926
Total liabilities subject to compromise	$ 675,926	$ 675,926
Secured Line of Credit | Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate subject to compromise (as a percent)	9.50%	9.50%
Secured Term Loan
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt, subject to compromise	$ 438,750	$ 438,750
Total liabilities subject to compromise	$ 438,750	$ 438,750
Secured Term Loan | Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate subject to compromise (as a percent)	9.50%	9.50%
Prepetition Unsecured Or Under Secured Liabilities
Debt Instrument [Line Items]
Total liabilities subject to compromise	$ 4,366	$ 4,170
Certain Property-level, Non-recourse Mortgage Loans
Debt Instrument [Line Items]
Unamortized deferred financing costs	2,310
Recourse and Nonrecourse Term Loans
Debt Instrument [Line Items]
Secured non-recourse and recourse term loans	$ 2,100,084