Investment in Unconsolidated Real Estate Ventures - Summary of Financial Position of Real Estate Ventures (Parenthetical) (Details) - USD ($) $ in Thousands	Mar. 31, 2019		Jan. 01, 2019	Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items]
Right of use asset - operating leases	$ 22,175	[1]	$ 22,400	$ 0
Lease liability - operating leases	22,402		$ 22,400	$ 0
MAP Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Right of use asset - operating leases	197,100
Lease liability - operating leases	$ 249,300

[1] On January 1, 2019, as a result of the adoption of Topic 842, Leases, the Company recognized operating ground leases for which it is a lessee on its consolidated balance sheets for the period ended March 31, 2019. See Note 2, “Basis of Presentation,” for further information.