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Investments in and Advances to Unconsolidated Affiliates - Core Portfolio - Additional Information (Details) |  |  |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended
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Aug. 08, 2019 USD ($) | Jan. 24, 2019 USD ($) ft² | Mar. 28, 2018 USD ($) | Nov. 16, 2017 USD ($) | May 01, 2017 USD ($) | Apr. 29, 2016 USD ($) | Sep. 30, 2019 USD ($) ft² | Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Purchase Price |  |  |  |  |  |  | $ 260,344,000 | $ 186,463,000
Cost method investments |  |  |  |  |  |  | 2,361,000 | 556,000
Notes receivable, net |  |  |  |  |  |  | $ 94,807,000 | 109,613,000
Acadia Brandywine Holdings, LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  | 22.22% |
Brandywine Portfolio |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Preferred return |  |  |  |  |  |  | $ 5,600,000 |
Core Portfolio |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Purchase Price |  |  |  |  |  |  | 82,440,000 | 1,337,000
Notes receivable, net |  |  |  |  |  |  | $ 56,475,000 | 56,475,000
Note receivable accrued interest |  |  |  |  |  |  |  | $ 200,000
Equity method investment, ownership percentage by third party |  |  | 14.11% | 38.89% |  |  | 24.78% |
Equity method investment, ownership percentage |  |  |  | 22.22% |  |  | 75.22% | 61.11%
Equity method investments |  |  | $ 22,300,000 | $ 61,600,000 |  |  | $ 228,827,000 | $ 231,432,000
Gain on equity method investment |  |  | 12,700,000 | 34,500,000 |  |  |  |
Core Portfolio | Renaissance Portfolio |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  | 20.00% |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  | 20.00% |
Equity method investments |  |  |  |  |  |  | $ 32,458,000 | $ 32,458,000
Core Portfolio | Fifth Wall Ventures Retail Fund, L.P. |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Cost method investments | $ 1,800,000 |  |  |  |  |  |  |
Maximum amount commitment to invest | $ 5,000,000.0 |  |  |  |  |  |  |
Cost method investment ownership percentage | 5.00% |  |  |  |  |  |  |
Core Portfolio | Brandywine Portfolio |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Square footage of real estate property (in square feet) | ft² |  |  |  |  |  |  | 1,000,000 |
Repayments of debt |  |  |  |  |  | $ 140,000,000.0 |  |
Note receivable exchanged |  |  | 22,000,000.0 |  | $ 16,000,000.0 |  |  |
Notes receivable, net |  |  |  |  | 153,400,000 |  | $ 38,700,000 |
Note receivable accrued interest |  |  | $ 300,000 |  | $ 300,000 |  |  |
Core Portfolio | Brandywine Portfolio | Exchange Transaction One |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Note receivable exchanged |  |  |  | 16,000,000.0 |  |  |  |
Note receivable accrued interest |  |  |  | 600,000 |  |  |  |
Core Portfolio | Brandywine Portfolio | Exchange Transaction Two |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Note receivable exchanged |  |  |  | 60,700,000 |  |  |  |
Note receivable accrued interest |  |  |  | $ 900,000 |  |  |  |
Core Portfolio | Market Square |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percentage by third party |  |  |  | 38.89% | 38.89% |  |  |
Equity method investment, ownership percentage |  |  |  | 22.22% | 61.11% |  |  |
Equity method investments |  |  |  |  | $ 16,300,000 |  |  |
Gain on equity method investment |  |  |  |  | $ 9,800,000 |  |  |
Core Portfolio | Washington, D.C. | Renaissance Portfolio |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Square footage of real estate property (in square feet) | ft² |  | 7,300 |  |  |  |  |  |
Purchase Price |  | $ 10,700,000 |  |  |  |  |  |
Purchase price less the assumption of the outstanding mortgage |  | $ 4,700,000 |  |  |  |  |  |

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