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Investments in and Advances to Unconsolidated Affiliates - Fund Investments - Additional Information (Details) |  |  |  |  |  |  |  |  | 9 Months Ended | 12 Months Ended |
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Aug. 21, 2019 USD ($) ft² | Jun. 29, 2019 USD ($) | Apr. 30, 2019 USD ($) ft² | Mar. 19, 2019 USD ($) ft² | Aug. 29, 2018 USD ($) property | Jun. 29, 2018 USD ($) property | May 15, 2018 USD ($) | Jan. 18, 2018 USD ($) property | Sep. 30, 2019 USD ($) property | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2014 property JointVenture | Oct. 31, 2018 segment
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase Price |  |  |  |  |  |  |  |  | $ 260,344,000 |  | $ 186,463,000 |  |
Number of retail properties | property |  |  |  |  |  |  |  |  | 182 |  |  |  |
Proceeds from the disposition of properties, net |  |  |  |  |  |  |  |  | $ 80,120,000 | $ 52,759,000 |  |  |
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% |  |  |  |
Washington REIT Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
Number of businesses acquired | property |  |  |  |  |  |  |  |  |  |  |  | 23 |
Number of retail properties | property |  |  |  |  |  |  |  |  | 13 |  |  |  |
Fund I Vs Broughton Street Portfolio Venture |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of retail properties | property |  |  |  |  |  | 2 |  |  |  |  |  | 8 |
Losses on cost method investments |  |  |  |  |  | $ 1,000,000.0 |  |  |  |  |  |  |
Fund I Vs Broughton Street Portfolio Venture | Partnership Interest | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Losses on cost method investments |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |
Fund IV | Disposed of by sale | Broughton St. Portfolio Savannah, GA |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of retail properties | property |  |  |  |  | 1 |  |  | 2 |  |  |  | 2 |
Proceeds from the disposition of properties, net |  |  |  |  | $ 2,100,000 |  |  | $ 8,000,000.0 |  |  |  |  |
Gain (loss) on disposal |  |  |  |  | (300,000) |  |  | (400,000) |  |  |  |  |
Fund IV | Disposed of by sale | Broughton St. Portfolio Savannah, GA | Partnership Interest |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  |  | $ 0 |  |  |  |  |
Fund IV | Disposed of by sale | Broughton St. Portfolio Savannah, GA | Partnership Interest | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  | $ (100,000) |  |  |  |  |  |  |  |
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 | Unconsolidated 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 |  |  |  |  | $ 3,200,000 |  |  |  |  |  |
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 |  |  |  |  | $ 800,000 |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |
Square footage of real estate property (in square feet) | ft² |  |  | 300,000 |  |  |  |  |  |  |  |  |  |
Purchase Price |  |  | $ 36,700,000 |  |  |  |  |  |  |  |  |  |
Frederick County, Maryland | Washington REIT Portfolio | 225,000 Square Foot Property |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Square footage of real estate property (in square feet) | ft² | 225,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase Price | $ 21,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Frederick County, Maryland | Washington REIT Portfolio | 300,00 Square Foot Property |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Square footage of real estate property (in square feet) | ft² | 300,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase Price | $ 33,100,000 |  |  |  |  |  |  |  |  |  |  |  |

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