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Fair Value Measurements - Long-Lived Assets Measured at Fair Value (Details)
 3 Months Ended
Mar. 31, 2021
USD ($)
mall
Mar. 31, 2020
USD ($)
mall
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Long-lived assets $ 38,500,000 $ 114,300,000
Loss on impairment $ 57,182,000 $ 133,644,000
Number of malls with impairment | mall 3 2
Malls    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Long-lived assets $ 38,500,000 $ 114,300,000
Loss on impairment $ 57,182,000 $ 133,644,000
Number of malls with impairment | mall 3 2
Eastland Mall | Malls    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Long-lived assets $ 10,700,000  
Loss on impairment $ 13,243,000  
Eastland Mall | Malls | Measurement Input, Expected Term    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Holding period 9 years  
Eastland Mall | Malls | Cap Rate (as a percent)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value measurement input (as a percent) 14.0  
Eastland Mall | Malls | Discount Rate (as a percent)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value measurement input (as a percent) 15.0  
Old Hickory Mall | Malls    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Long-lived assets $ 12,400,000  
Loss on impairment $ 20,149,000  
Old Hickory Mall | Malls | Measurement Input, Expected Term    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Holding period 9 years  
Old Hickory Mall | Malls | Cap Rate (as a percent)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value measurement input (as a percent) 13.0  
Old Hickory Mall | Malls | Discount Rate (as a percent)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value measurement input (as a percent) 14.0  
Stroud Mall | Malls    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Long-lived assets $ 15,400,000  
Loss on impairment $ 23,790,000  
Stroud Mall | Malls | Measurement Input, Expected Term    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Holding period 9 years  
Stroud Mall | Malls | Cap Rate (as a percent)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value measurement input (as a percent) 11.75  
Stroud Mall | Malls | Discount Rate (as a percent)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value measurement input (as a percent) 12.5  
Asheville Mall and Park Plaza    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Long-lived assets $ 0  
Burnsville Center | Malls    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Long-lived assets   $ 47,300,000
Loss on impairment   $ 26,562,000
Burnsville Center | Malls | Measurement Input, Expected Term    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Holding period   10 years
Burnsville Center | Malls | Cap Rate (as a percent)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value measurement input (as a percent)   14.5
Burnsville Center | Malls | Discount Rate (as a percent)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value measurement input (as a percent)   15.5
Monroeville Mall | Malls    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Long-lived assets   $ 67,000,000
Loss on impairment   $ 107,082,000
Monroeville Mall | Malls | Measurement Input, Expected Term    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Holding period   10 years
Monroeville Mall | Malls | Cap Rate (as a percent)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value measurement input (as a percent)   14.0
Monroeville Mall | Malls | Discount Rate (as a percent)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value measurement input (as a percent)   14.5
Significant Unobservable Inputs (Level 3)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Long-lived assets $ 38,500,000 $ 114,300,000