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Investment in Unconsolidated Real Estate Ventures - Summary of Results of Operations of Real Estate Ventures with Interests (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Mar. 31, 2016 | Sep. 30, 2016
Brandywine - AI Venture LLC [Member] |  |
Schedule Of Equity Method Investments [Line Items] |  |
Provision for impairment of investment in real estate ventures |  | $ 10.4
MAP Venture [Member] |  |
Schedule Of Equity Method Investments [Line Items] |  |
Acquisition deal costs | $ 7.1 |

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