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Investment in Unconsolidated Real Estate Ventures - Summary of Financial Position of Real Estate Ventures (Parenthetical) (Details) - Coppell Associates [Member] - USD ($) $ in Millions | Jun. 30, 2016 | Jan. 29, 2016 | Dec. 31, 2015
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Schedule Of Equity Method Investments [Line Items] |  |  |
Equity method investment percentage |  | 50.00% |
Other Liabilities [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Negative investment balance | $ 0.0 |  | $ 1.1
Equity method investment percentage | 50.00% |  |

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