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Combined Guarantor Subsidiaries - Fair Value Measurements - Impairment of Real Estate Properties (Details) - Guarantor Subsidiaries
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loss on impairment $ 60,170,000 $ 0 $ 43,007,000
Long-lived assets 95,300,000   67,300,000
Malls      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loss on impairment 60,170,000    
Long-lived assets 95,300,000    
Greenbrier Mall | Malls      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loss on impairment 22,770,000    
Long-lived assets $ 56,300,000    
Greenbrier Mall | Malls | Measurement Input, Expected Term      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Holding period 10 years    
Greenbrier Mall | Malls | Cap Rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value measurement input (as a percent) 11.0    
Greenbrier Mall | Malls | Discount Rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value measurement input (as a percent) 11.5    
Park Plaza Mall | Malls      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loss on impairment $ 37,400,000    
Long-lived assets $ 39,000,000    
Park Plaza Mall | Malls | Measurement Input, Expected Term      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Holding period 10 years    
Park Plaza Mall | Malls | Cap Rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value measurement input (as a percent) 15.0    
Park Plaza Mall | Malls | Discount Rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value measurement input (as a percent) 14.0    
Acadiana Mall | Malls      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loss on impairment     43,007,000
Long-lived assets     $ 67,300,000
Acadiana Mall | Malls | Measurement Input, Expected Term      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Holding period     10 years
Acadiana Mall | Malls | Cap Rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value measurement input (as a percent)     15.5
Acadiana Mall | Malls | Discount Rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value measurement input (as a percent)     15.75