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Investment in Unconsolidated Real Estate Ventures - Summary of Results of Operations of Real Estate Ventures with Interests (Parenthetical) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($)
Schedule Of Equity Method Investments [Line Items] |
Provision for impairment of investment in real estate ventures | $ 7.3
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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