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Investments in Unconsolidated Joint Ventures - Narrative (Details) - Joint Venture - USD ($) $ in Thousands | Dec. 18, 2019 | Aug. 16, 2019 | Jul. 25, 2019 | Sep. 12, 2019
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Fashion District Philadelphia |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Additional borrowings |  |  | $ 100,000 |
Interest rate spread over basis |  |  | 2.00% |
Amount of additional borrowing |  | $ 25,000 | $ 26,000 |
Tysons Tower |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
New loan |  |  |  | $ 190,000
Effective interest rate |  |  |  | 3.38%
HPP-MAC WSP, LLC—One Westside [Member] | Redevelopment Construction Loan [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Amount of additional borrowing | $ 414,600 |  |  |
HPP-MAC WSP, LLC—One Westside [Member] | Redevelopment Construction Loan [Member] | LIBOR |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Interest rate spread over basis | 1.70% |  |  |
Variable interest rate spread, contingent (as a percent) | 1.50% |  |  |

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