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Subsequent Events - Additional Information (Details) $ in Thousands |  |  | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 02, 2020 USD ($) | Oct. 30, 2020 USD ($) | Oct. 31, 2020 USD ($) loan Aqreement Store | Sep. 30, 2020 USD ($) Aqreement | Dec. 31, 2019 USD ($) | May 01, 2017 USD ($)
Subsequent Event [Line Items] |  |  |  |  |  |
Core portfolio annualized base rents for stores of bankruptcies percentage |  |  |  | 1.90% |  |
Fund mortgages aggregate outstanding balances |  |  |  | $ 134,798 | $ 114,943 |
Principal reductions aggregate amount |  |  |  | 4,200 |  |
Notes receivable |  |  |  | $ 135,708 | 114,943 |
Fund II |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Maturity date |  |  |  | Dec. 07, 2020 |  |
Core Portfolio |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Notes receivable |  |  |  | $ 96,794 | 76,467 |
Core Portfolio | Brandywine Portfolio |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Fund mortgages aggregate outstanding balances |  |  |  |  |  | $ 153,400
Notes receivable |  |  |  | 38,700 | 38,700 |
Fund Portfolio | Fund II |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Notes receivable |  |  |  | $ 33,608 | $ 33,170 |
COVID-19 |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of rent concession agreements | Aqreement |  |  |  | 237 |  |
Number of rent concession agreements for rent deferral | Aqreement |  |  |  | 210 |  |
Subsequent Event | Fund II |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Notes receivable | $ 33,600 |  |  |  |  |
Maturity date | Apr. 15, 2021 |  |  |  |  |
Notes receivable modifications, reduction in outstanding balance | $ 10,000 |  |  |  |  |
Subsequent Event | Brandywine Portfolio |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Gain (loss) on litigation settlement |  | $ 30,000 |  |  |  |
Subsequent Event | Fund IV | Consolidated Properties |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of mortgage loans modified | loan |  |  | 2 |  |  |
Fund mortgages aggregate outstanding balances |  |  | $ 96,200 |  |  |
Principal reductions aggregate amount |  |  | $ 8,200 |  |  |
Subsequent Event | Fund IV | Unconsolidated Properties |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of mortgage loans modified | loan |  |  | 1 |  |  |
Fund mortgages aggregate outstanding balances |  |  | $ 15,300 |  |  |
Subsequent Event | Fund IV | Minimum | Unconsolidated Properties |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Maturity period |  |  | 1 year |  |  |
Subsequent Event | Fund IV | Maximum | Unconsolidated Properties |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Maturity period |  |  | 2 years |  |  |
Subsequent Event | COVID-19 |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of rent concession agreements | Aqreement |  |  | 18 |  |  |
Number of rent concession agreements for rent deferral | Aqreement |  |  | 9 |  |  |
Number of rent concession agreements for rent forgiveness | Aqreement |  |  | 9 |  |  |
Rent concession aggregate amount |  |  | $ 1,400 |  |  |
Subsequent Event | COVID-19 | Core Portfolio |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of stores | Store |  |  | 6 |  |  |
Annual base rent amount |  |  | $ 2,600 |  |  |
Core portfolio annualized base rents for stores of bankruptcies percentage |  |  | 1.90% |  |  |
Subsequent Event | COVID-19 | Fund Portfolio |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of stores | Store |  |  | 17 |  |  |
Annual base rent amount |  |  | $ 1,100 |  |  |
Core portfolio annualized base rents for stores of bankruptcies percentage |  |  | 5.20% |  |  |

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