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Combined Guarantor Subsidiaries - Fair Value Measurements - Long-Lived Assets Measured at Fair Value (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Loss on impairment $ 13,274,000 $ 41,608,000 $ 146,918,000 $ 66,433,000
Long-lived assets 166,900,000 $ 127,319,000 166,900,000 $ 127,319,000
Malls        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Loss on impairment $ 13,274,000   $ 146,918,000  
Greenbriar Mall | Malls | Measurement Input, Expected Term        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Holding period       10 years
Greenbriar 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)   11.5   11.5
Greenbriar 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)   11.5   11.5
Guarantor Subsidiaries        
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   56,300,000
Guarantor Subsidiaries | Greenbriar 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   $ 56,300,000
Guarantor Subsidiaries | Greenbriar Mall | Malls | Measurement Input, Expected Term        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Holding period       10 years
Guarantor Subsidiaries | Greenbriar 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)   11.5   11.5
Guarantor Subsidiaries | Greenbriar 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)   11.5   11.5