Investments in and Advances to Joint Ventures - Investments in and Advances to Joint Ventures (Parenthetical) (Detail) (Blackstone Group LP [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Blackstone Group LP [Member]
Schedule Of Equity Method Investments [Line Items]
Preferred equity investments with an affiliate of Blackstone	$ 305,310	$ 71,771

- Definition

As of the reporting date, the carrying amount of noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. The noncontrolling interest holder's ownership (or holders' ownership) may be in the form of preferred shares (regardless of class), preferred partnership units (regardless of class), preferential membership interests, or any other form of preferred equity regardless of investee entity legal form.

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