Investments in and Advances to Unconsolidated Affiliates - Fund Investments - Additional Information (Details) $ in Millions	Jun. 30, 2021 Property	Jun. 30, 2020 Property	May 26, 2020 USD ($) Property
Schedule of Equity Method Investments [Line Items]
Number of retail properties	180
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