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