Segments Disclosure - Schedule of Each Reportable Segment Information of Predecessor (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues
Rental income	$ 145,917		$ 289,160
Tenant reimbursement income	12,063		25,551
Fee and other income	4,948		9,443
Total revenues	162,928		324,154
Total expenses	154,543		303,762
Operating income (loss)	8,385		20,392
Income from unconsolidated joint ventures	2,011		2,986
Unrealized gain (loss) on interest rate swaps	21,747		33,725
Interest and other income, net	512		1,366
Interest and debt expense	(42,236)		(84,124)
Net income (loss) before income taxes	4,491		(6,362)
Income tax expense	(1,343)		(1,917)
Net income (loss)	3,148		(8,279)
Net income (loss) attributable to common shareholders	(4,709)		(14,440)
Owned Properties [Member]
Revenues
Rental income	145,349		287,826
Tenant reimbursement income	12,063		25,551
Fee and other income	3,168		6,123
Total revenues	160,580		319,500
Total expenses	138,001		273,652
Operating income (loss)	22,579		45,848
Income from unconsolidated joint ventures	1,985		2,925
Unrealized gain (loss) on interest rate swaps	21,747		33,725
Interest and other income, net	91		185
Interest and debt expense	(39,741)		(78,873)
Net income (loss) before income taxes	6,661		3,810
Income tax expense	467		7
Net income (loss)	$ 7,128		$ 3,817
Predecessor [Member]
Revenues
Rental income		$ 8,499		$ 16,312
Tenant reimbursement income		441		896
Distributions from real estate fund investments		4,744		11,247
Realized and unrealized gains, net		33,750		79,917
Fee and other income		6,400		11,582
Total revenues		53,834		119,954
Total expenses		17,548		37,900
Operating income (loss)		36,286		82,054
Income from unconsolidated joint ventures		903		2,035
Unrealized gain (loss) on interest rate swaps		(354)		(196)
Interest and other income, net		997		1,706
Interest and debt expense		(7,988)		(15,787)
Net income (loss) before income taxes		29,844		69,812
Income tax expense		(3,842)		(7,105)
Net income (loss)		26,002		62,707
Net income attributable to noncontrolling interests		(25,823)		(53,133)
Net income (loss) attributable to common shareholders		179		9,574
Predecessor [Member] | Operating Segments [Member] | Owned Properties [Member]
Revenues
Rental income		7,813		15,464
Tenant reimbursement income		441		896
Total revenues		8,254		16,360
Total expenses		6,677		13,502
Operating income (loss)		1,577		2,858
Income from unconsolidated joint ventures		903		2,035
Interest and other income, net		684		1,347
Interest and debt expense		(3,880)		(7,665)
Net income (loss) before income taxes		(716)		(1,425)
Net income (loss)		(716)		(1,425)
Net income (loss) attributable to common shareholders		(716)		(1,425)
Predecessor [Member] | Operating Segments [Member] | Managed Funds [Member]
Revenues
Rental income		686		848
Distributions from real estate fund investments		4,744		11,247
Realized and unrealized gains, net		33,750		79,917
Total revenues		39,180		92,012
Total expenses		6,475		17,001
Operating income (loss)		32,705		75,011
Unrealized gain (loss) on interest rate swaps		(354)		(196)
Interest and other income, net		310		356
Interest and debt expense		(4,069)		(8,083)
Net income (loss) before income taxes		28,592		67,088
Net income (loss)		28,592		67,088
Net income attributable to noncontrolling interests		(25,823)		(53,133)
Net income (loss) attributable to common shareholders		2,769		13,955
Predecessor [Member] | Operating Segments [Member] | Management Company [Member]
Revenues
Fee and other income		14,137		27,910
Total revenues		14,137		27,910
Total expenses		12,133		23,725
Operating income (loss)		2,004		4,185
Income from unconsolidated joint ventures		11,568		25,858
Interest and other income, net		3		3
Interest and debt expense		(39)		(39)
Net income (loss) before income taxes		13,536		30,007
Income tax expense		(3,842)		(7,105)
Net income (loss)		9,694		22,902
Net income (loss) attributable to common shareholders		9,694		22,902
Predecessor [Member] | Eliminations [Member]
Revenues
Fee and other income		(7,737)		(16,328)
Total revenues		(7,737)		(16,328)
Total expenses		(7,737)		(16,328)
Income from unconsolidated joint ventures		(11,568)		(25,858)
Net income (loss) before income taxes		(11,568)		(25,858)
Net income (loss)		(11,568)		(25,858)
Net income (loss) attributable to common shareholders		$ (11,568)		$ (25,858)