Summary of Significant Accounting Policies - Schedule of Balance Sheets Impact from ASUs Adoption (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investments in and advances to unconsolidated joint ventures	$ 863,775	$ 800,840
Other assets, net	583,261	578,033
Deferred revenue	167,975	144,709
Total stockholders' equity	5,206,291	$ 5,301,005
As Would Have Been Reported Prior to Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investments in and advances to unconsolidated joint ventures	792,291
Other assets, net	586,066
Deferred revenue	178,440
Total stockholders' equity	$ 5,127,147