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Investments in and Advances to Unconsolidated Affiliates - Fund Investments - Additional Information (Details) |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 29, 2018 USD ($) property | Jun. 29, 2018 USD ($) property | May 15, 2018 USD ($) | Jan. 18, 2018 USD ($) property | Mar. 31, 2019 USD ($) property
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of retail properties | property |  |  |  |  | 174
Proceeds from the disposition of properties, net |  |  |  |  | $ 9,779,000
Fund III's Storage Post venture |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Distribution from cost method investment |  |  | $ 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 |  |  | $ 800,000 |  |
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 |
Proceeds from the disposition of properties, net | $ 2,100,000 |  |  | $ 8,000,000 |
Gain (loss) on disposal | (300,000) |  |  | (400,000) |
Fund IV | Partnership Interest | Disposed of by sale | Broughton St. Portfolio Savannah, GA |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (loss) on disposal |  |  |  | $ 0 |
Fund IV | Partnership Interest | Disposed of by sale | Broughton St. Portfolio Savannah, GA | Maximum |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (loss) on disposal | $ (100,000) |  |  |  |
Fund IV's Broughton Street Portfolio venture |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of retail properties | property |  | 2 |  |  |
Losses on cost method investments |  | $ 1,000,000 |  |  |
Fund IV's Broughton Street Portfolio venture | Partnership Interest | Maximum |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Losses on cost method investments |  | $ 100,000 |  |  |

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