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