Segments Disclosure - Schedule of Reconciliation of NOI to Net (Loss) Income Attributable to Common Stockholders (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
NOI	$ 42,040									$ 433,565	$ 423,986
Fee income	1,176									16,931	10,248
Depreciation and amortization expense	(34,481)									(269,450)	(294,624)
General and administrative expenses	(2,207)									(53,510)	(42,056)
Transaction related costs and transfer taxes due in connection with the sale of shares by a former joint venture partner										(2,404)	(10,355)
NOI from unconsolidated joint ventures	(1,680)									(17,195)	(16,580)
Income from unconsolidated joint ventures	938									7,413	6,850
Income from real estate fund investments	1,412										37,975
Loss from unconsolidated real estate funds										(498)
Interest and other income (loss), net	(179)									6,934	871
Interest and debt expense	(43,743)									(157,746)	(168,366)
Unrealized gain on interest rate swaps	15,084									39,814	75,760
Gain on consolidation of an unconsolidated joint venture	239,716
Net income before income taxes	73,227									3,854	23,709
Income tax expense	(505)									(1,785)	(2,566)
Net income	72,722									2,069	21,143
Consolidated real estate funds	(135)									1,316	(21,173)
Consolidated joint ventures	(1,353)									(15,423)	(5,459)
Operating Partnership	(13,926)									2,104	1,070
Net (loss) income attributable to common stockholders	57,308	$ (6,489)	$ (139)	$ 3,188	$ (6,494)	$ 8,905	$ 1,116	$ (4,709)	$ (9,731)	(9,934)	(4,419)
Deal Cost [Member]
Segment Reporting Information [Line Items]
Transaction related costs and transfer taxes due in connection with the sale of shares by a former joint venture partner										$ (2,404)	(4,483)
Formation Related Costs [Member]
Segment Reporting Information [Line Items]
Transaction related costs and transfer taxes due in connection with the sale of shares by a former joint venture partner	$ (143,437)
Transfer Taxes [Member]
Segment Reporting Information [Line Items]
Transaction related costs and transfer taxes due in connection with the sale of shares by a former joint venture partner											$ (5,872)