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Investment in Unconsolidated Real Estate Ventures - Summary of Results of Operations of Real Estate Ventures with Interests (Parenthetical) (Details) | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2018
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evo at Cira Centre South [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage | 50.00% | [1] | 50.00% | [1] | 50.00%
Unconsolidated Real Estate Ventures [Member] | Minimum [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage | 15.00% |  | 25.00% |  |
Unconsolidated Real Estate Ventures [Member] | Maximum [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage | 70.00% |  | 70.00% |  |
[1] | The Company sold its 50% ownership interest in evo at Cira Centre South Venture during the first quarter of 2018.

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