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Investments in and Advances to Unconsolidated Affiliates - Fund Investments - Additional Information (Details) $ in Millions | Sep. 30, 2021 Property | Jun. 30, 2020 Property | May 26, 2020 USD ($) Property
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Schedule of Equity Method Investments [Line Items] |  |  |
Number of retail properties | 182 |  |
Broughton St. Portfolio Savannah, GA |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of retail properties |  |  | 2
Purchase Price | $ |  |  | $ 1.3
Consolidated Affiliates | BSP II |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of retail properties |  | 2 |

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