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Investments in and Advances to Unconsolidated Affiliates - Fund Investments - Additional Information (Details) |  | 12 Months Ended |  |  |  |  |  |  |  |
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Jun. 29, 2019 USD ($) | Dec. 31, 2014 property JointVenture | Sep. 30, 2020 USD ($) property | Jun. 30, 2020 property | May 26, 2020 USD ($) property | Dec. 31, 2019 USD ($) | Aug. 21, 2019 USD ($) ft² | Apr. 30, 2019 USD ($) ft² | Mar. 19, 2019 USD ($) ft² | Oct. 31, 2018 segment
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of retail properties | property |  |  | 187 |  |  |  |  |  |  |
Closing Costs |  |  | $ 3,899,993,000 |  |  | $ 3,846,140,000 |  |  |  |
Fund V Family Center at Riverdale |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  | 89.42% |  |  |  |  |  |  |
Tri City Plaza |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  | 90.00% |  |  |  |  |  |  |
Frederick County Acquisitions |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  | 90.00% |  |  |  |  |  |  |
BSP I and BSP II |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 50.00% |  |  |  |  |  |  |  |
Number of Joint Ventures | JointVenture |  | 2 |  |  |  |  |  |  |  |
Broughton St. Portfolio Savannah, GA |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase Price |  |  |  |  | $ 1,200,000 |  |  |  |  |
Equity method investment, ownership percentage |  |  | 100.00% |  |  |  |  |  |  |
Number of businesses acquired | property |  | 23 |  |  |  |  |  |  |  |
Number of retail properties | property |  |  |  |  | 2 |  |  |  |  |
Closing Costs |  |  |  |  | $ 100,000 |  |  |  |  |
Fund I Vs Broughton Street Portfolio Venture |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of retail properties | property |  | 8 |  |  |  |  |  |  |  |
Fund IV | Disposed of by sale | Broughton St. Portfolio Savannah, GA |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of retail properties | property |  | 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 | segment |  |  |  |  |  |  |  |  |  | 11
BSP II | Consolidated Affiliates |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of retail properties | property |  |  |  | 2 |  |  |  |  |  |
Fund III's Storage Post venture |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Distribution from cost method investment | $ 1,600,000 |  |  |  |  |  |  |  |  |
Cost method investments | 0 |  |  |  |  |  |  |  |  |
Fund III's Storage Post venture | Partnership Interest |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Distribution from cost method investment | $ 400,000 |  |  |  |  |  |  |  |  |
Riverdale, Utah | Fund V Family Center at Riverdale |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Joint venture interest percentage |  |  |  |  |  |  |  |  | 99.35% |
Undivided interest in property percentage |  |  |  |  |  |  |  |  | 90.00% |
Square footage of real estate property (in square feet) | ft² |  |  |  |  |  |  |  |  | 428,000 |
Purchase Price |  |  |  |  |  |  |  |  | $ 48,500,000 |
Vernon, Connecticut | Tri City Plaza |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Joint venture interest percentage |  |  |  |  |  |  |  | 90.00% |  |
Square footage of real estate property (in square feet) | ft² |  |  |  |  |  |  |  | 300,000 |  |
Purchase Price |  |  |  |  |  |  |  | $ 36,700,000 |  |
Frederick County, Maryland | Frederick County Acquisitions | 225,000 Square Foot Property |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Joint venture interest percentage |  |  |  |  |  |  | 90.00% |  |  |
Square footage of real estate property (in square feet) | ft² |  |  |  |  |  |  | 225,000 |  |  |
Purchase Price |  |  |  |  |  |  | $ 21,800,000 |  |  |
Frederick County, Maryland | Frederick County Acquisitions | 300,00 Square Foot Property |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Joint venture interest percentage |  |  |  |  |  |  | 90.00% |  |  |
Square footage of real estate property (in square feet) | ft² |  |  |  |  |  |  | 300,000 |  |  |
Purchase Price |  |  |  |  |  |  | $ 33,100,000 |  |  |

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