Unconsolidated Entities - Summary of Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Equity Method Investments [Line Items]
Other ventures	$ 4,755,620	$ 4,824,724
Unconsolidated Co-Investment Ventures [Member]
Schedule Of Equity Method Investments [Line Items]
Other ventures	4,585,427	4,665,918
Other Joint Ventures [Member]
Schedule Of Equity Method Investments [Line Items]
Other ventures	$ 170,193	$ 158,806