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Investments in and Advances to Unconsolidated Affiliates - Fund Investments - Additional Information (Details) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 29, 2018 USD ($) property | Jun. 29, 2018 USD ($) property | May 15, 2018 USD ($) | Jan. 18, 2018 USD ($) property | Jun. 30, 2017 USD ($) | Feb. 15, 2017 USD ($) | Jan. 31, 2017 USD ($) | Sep. 30, 2018 USD ($) property | Dec. 31, 2017 USD ($) property | Dec. 21, 2017 USD ($) property | Sep. 30, 2017 USD ($) property | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) property | Dec. 31, 2018 USD ($) property segment | Dec. 31, 2017 USD ($) property | Dec. 31, 2016 USD ($) | Dec. 31, 2014 property JointVenture | Oct. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost method investments |  |  |  |  |  |  |  |  | $ 556,000 |  |  |  |  | $ 556,000 | $ 556,000 |  |  |
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,302,000 | 23,371,000 | $ 39,449,000 |  |
Number of retail properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  | 171 |  |  |  |
Proceeds from the disposition of properties, net |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 63,866,000 | 260,711,000 | 150,378,000 |  |
Return of capital from unconsolidated affiliates and other |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 26,338,000 | $ 43,684,000 | $ 79,030,000 |  |
Disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of retail properties | property |  |  |  |  |  |  |  | 2 | 3 |  | 2 |  | 2 |  | 3 |  |  |
Gain (loss) on disposal |  |  |  |  |  |  |  | $ 5,100,000 | $ 35,900,000 |  | $ 13,000,000 | $ 3,300,000 | $ 14,500,000 |  |  |  |  |
Partnership Interest | Disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  |  |  |  |  |  | 800,000 | $ 2,700,000 |  |  |  |  |
Mervyns I and Mervyns II |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution from equity method investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,100,000 |  |  |
Equity method investments |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  |  |
Albertson's |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost method investment ownership interest |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.05% |  |  |  |
Distribution from cost method investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,400,000 |  |  |
Cost method investments |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  |  |
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 investments |  |  |  |  |  |  |  |  | 48,335,000 |  |  |  |  | $ 3,236,000 | 48,335,000 |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  |  | 82,143,000 |  |  |  |  | $ 30,656,000 | 82,143,000 |  |  |
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 |  |  |  |  |  | 5 |  |  |  |  |  |  | 2 |
Proceeds from the disposition of properties, net | $ 2,000,000 |  |  | $ 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal | (300,000) |  |  | (400,000) |  |  |  |  |  | $ 1,200,000 |  |  |  |  |  |  |  |
Return of capital from unconsolidated affiliates and other |  |  |  |  |  |  |  |  |  | 11,000,000 |  |  |  |  |  |  |  |
Fund IV | Disposed of by sale | 2819 Kennedy Boulevard |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  | $ 6,300,000 |  |  |  |  |  |  |  |  |  |  |
Consideration received |  |  |  |  |  |  | 19,000,000 |  |  |  |  |  |  |  |  |  |  |
Return of capital from unconsolidated affiliates and other |  |  |  |  |  |  | 10,600,000 |  |  |  |  |  |  |  |  |  |  |
Fund IV | Disposed of by sale | 2819 Kennedy Boulevard | Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  | 8,400,000 |  |  |  |  |  |  |  |  |  |  |
Fund IV | Disposed of by sale | 1701 Belmont Avenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration received |  |  |  |  | $ 5,600,000 |  |  |  |  |  |  | $ 5,600,000 |  |  |  |  |  |
Return of capital from unconsolidated affiliates and other |  |  |  |  | 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Fund IV | Disposed of by sale | 1701 Belmont Avenue | Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  | 2,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |
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 | Partnership Interest | Disposed of by sale | 2819 Kennedy Boulevard |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  | 1,400,000 |  |  |  |  |  |  |  |  |  |  |
Fund IV | Consolidated Entity | Disposed of by sale | Broughton St. Portfolio Savannah, GA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  |  |  |  | $ 600,000 |  |  |  |  |  |  |  |
Fund IV | Consolidated Entity | Disposed of by sale | 2819 Kennedy Boulevard |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  | $ 6,200,000 |  |  |  |  |  |  |  |  |  |  |
Fund IV | Consolidated Entity | Disposed of by sale | 1701 Belmont Avenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  | $ 3,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  |  | $ 373,000 |  |  |  |  | $ 227,000 | $ 373,000 |  |  |
Fund III | Disposed of by sale | Arundel Plaza |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  | $ 8,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Consideration received |  |  |  |  |  | 28,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Return of capital from unconsolidated affiliates and other |  |  |  |  |  | 18,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Fund III | Disposed of by sale | Arundel Plaza | Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Fund III | Partnership Interest | Disposed of by sale | Arundel Plaza |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Fund III | Consolidated Entity | Disposed of by sale | Arundel Plaza |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  | $ 5,300,000 |  |  |  |  |  |  |  |  |  |  |  |

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