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Fair Value Measurements - Long-Lived Assets Measured at Fair Value (Details)
 3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loss on impairment $ 133,644,000 $ 24,825,000
Long-lived assets 114,300,000 70,800,000
Malls    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loss on impairment 133,644,000  
Burnsville Center | Malls    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loss on impairment 26,562,000  
Long-lived assets $ 47,300,000  
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]    
Loss on impairment $ 107,082,000  
Long-lived assets $ 67,000,000  
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  
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
Honey Creek Mall | Malls    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loss on impairment   2,284,000
Long-lived assets   14,500,000
Assets book value   14,360,000
Prior Sales Adjustment | Malls    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loss on impairment   (229,000)
Greenbriar Mall | Malls    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Long-lived assets   $ 56,300,000
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
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