Investment in Unconsolidated Real Estate Ventures - Summary of Financial Position of Real Estate Ventures (Parenthetical) (Details) - Coppell Associates [Member] - USD ($) $ in Millions	Mar. 31, 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]
Negative investment balance	$ 0.0		$ 1.1
Equity method investment percentage	50.00%