Investment in Unconsolidated Real Estate Ventures - Summary of Results of Operations of Real Estate Ventures with Interests (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule Of Equity Method Investments [Line Items]
Equity in income (loss) of Real Estate Ventures		$ 1,084	$ (1,666)	$ 336	$ (2,069)
Unconsolidated Real Estate Ventures [Member]
Schedule Of Equity Method Investments [Line Items]
Revenue		58,819	53,406	113,098	99,931
Operating expenses		(25,172)	(27,088)	(50,338)	(53,755)
Interest expense, net		(11,272)	(10,928)	(22,101)	(19,917)
Depreciation and amortization		(20,371)	(20,242)	(41,133)	(40,403)
Net income (loss)	[1]	2,004	(4,852)	(474)	(14,144)
Equity in income (loss) of Real Estate Ventures		$ 1,084	$ (1,666)	$ 336	$ (2,069)

[1] The six-month period ended June 30, 2016 amount includes $7.1 million of acquisition deal costs related to the formation of the MAP Venture.