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Investments in and Advances to Unconsolidated Affiliates - Fund Investments - Additional Information (Details) $ in Thousands |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 29, 2019 USD ($) | Dec. 31, 2014 Property | Dec. 31, 2021 Property | Jun. 30, 2020 Property | May 26, 2020 USD ($) Property | Oct. 31, 2018 Property
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of retail properties |  |  | 186 |  |  |
BSP I and BSP II |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  | 50.00% |  |  |  |
Number of Joint Ventures |  | 2 |  |  |  |
Fund I Vs Broughton Street Portfolio Venture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of retail properties |  | 8 |  |  |  |
Fund IV | Disposed of by sale |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of retail properties |  | 2 |  |  |  |
BSP I |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  | 100.00%
BSP I | Consolidated Entity |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of retail properties |  |  |  |  |  | 11
Fund III's Storage Post venture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Distribution from cost method investment | $ | $ 1,600 |  |  |  |  |
Cost method investments | $ | 0 |  |  |  |  |
Fund III's Storage Post venture | Partnership Interest |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Distribution from cost method investment | $ | $ 400 |  |  |  |  |
BSP II | Consolidated Affiliates |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of retail properties |  |  |  | 2 |  |
Broughton Street Portfolio |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Purchase Price | $ |  |  |  |  | $ 1,300 |
Number of businesses acquired |  | 23 |  |  |  |
Number of retail properties |  |  |  |  | 2 |

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