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Fair Value Measurements - Long-Lived Assets Measured at Fair Value (Details) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) mall | Jun. 30, 2021 USD ($) mall | Jun. 30, 2020 USD ($) mall
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Long-lived assets | $ 38,500,000 | $ 166,900,000 | $ 38,500,000 | $ 166,900,000
Loss on impairment | 0 | 13,274,000 | $ 57,182,000 | $ 146,918,000
Number of malls with impairment | mall |  |  | 3 | 3
Malls |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Long-lived assets | 38,500,000 | 166,900,000 | $ 38,500,000 | $ 166,900,000
Loss on impairment |  | $ 13,274,000 | $ 57,182,000 | $ 146,918,000
Number of malls with impairment | mall |  | 1 | 3 | 3
Eastland Mall | Malls |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Long-lived assets | $ 10,700,000 |  | $ 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 |  | 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 |  | 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 |  | $ 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 |  | 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 |  | 14.0 |
Stroud Mall | Malls |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Long-lived assets | $ 15,400,000 |  | $ 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 |  | 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 |  | 12.5 |
Asheville Mall and Park Plaza |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Long-lived assets | $ 0 |  | $ 0 |
Burnsville Center | Malls |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Long-lived assets |  | $ 47,300,000 |  | $ 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 |  | 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 |  | 15.5
Monroeville Mall | Malls |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Long-lived assets |  | $ 67,000,000 |  | $ 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 |  | 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 |  | 14.5
Asheville Mall | Malls |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Long-lived assets |  | $ 52,600,000 |  | $ 52,600,000
Loss on impairment |  |  |  | $ 13,274,000
Asheville Mall | Malls | Measurement Input, Expected Term |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Holding period |  |  |  | 10 years
Asheville 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) |  | 13.25 |  | 13.25
Asheville 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 |  | 14.0
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Long-lived assets | $ 38,500,000 | $ 166,900,000 | $ 38,500,000 | $ 166,900,000

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