Segments Disclosure - Schedule of Each Reportable Segment Information of Predecessor (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues
Rental income	$ 146,470		$ 435,630
Tenant reimbursement income	14,405		39,956
Fee and other income	6,851		16,294
Total revenues	167,726		491,880
Total expenses	141,159		444,921
Operating income (loss)	26,567		46,959
Income from unconsolidated joint ventures	1,458		4,444
Unrealized gain (loss) on interest rate swaps	15,772		49,497
Interest and other income (loss), net	(1,763)		(397)
Interest and debt expense	(42,821)		(126,945)
Net income before income taxes	10,146		3,784
Income tax expense	(789)		(2,706)
Net income	9,357		1,078
Net income (loss) attributable to common stockholders	1,116		(13,324)
Owned Properties [Member]
Revenues
Rental income	145,711		433,537
Tenant reimbursement income	14,405		39,956
Fee and other income	4,767		10,890
Total revenues	164,883		484,383
Total expenses	134,667		408,319
Operating income (loss)	30,216		76,064
Income from unconsolidated joint ventures	1,433		4,358
Unrealized gain (loss) on interest rate swaps	15,772		49,497
Interest and other income (loss), net	119		304
Interest and debt expense	(41,811)		(120,684)
Net income before income taxes	5,729		9,539
Income tax expense	275		282
Net income	$ 6,004		$ 9,821
Predecessor [Member]
Revenues
Rental income		$ 8,775		$ 25,087
Tenant reimbursement income		370		1,266
Distributions from real estate fund investments		5,086		16,333
Realized and unrealized gains, net		43,233		123,150
Fee and other income		13,928		25,510
Total revenues		71,392		191,346
Total expenses		17,706		55,606
Operating income (loss)		53,686		135,740
Income from unconsolidated joint ventures		1,777		3,812
Unrealized gain (loss) on interest rate swaps		(477)		(673)
Interest and other income (loss), net		1		1,707
Interest and debt expense		(8,015)		(23,802)
Net income before income taxes		46,972		116,784
Income tax expense		(820)		(7,925)
Net income		46,152		108,859
Net income attributable to noncontrolling interests		(33,248)		(86,381)
Net income (loss) attributable to common stockholders		12,904		22,478
Predecessor [Member] | Operating Segments [Member] | Owned Properties [Member]
Revenues
Rental income		7,765		23,229
Tenant reimbursement income		370		1,266
Total revenues		8,135		24,495
Total expenses		6,511		20,013
Operating income (loss)		1,624		4,482
Income from unconsolidated joint ventures		1,777		3,812
Interest and other income (loss), net		(89)		1,258
Interest and debt expense		(3,983)		(11,648)
Net income before income taxes		(671)		(2,096)
Net income		(671)		(2,096)
Net income (loss) attributable to common stockholders		(671)		(2,096)
Predecessor [Member] | Operating Segments [Member] | Managed Funds [Member]
Revenues
Rental income		1,010		1,858
Distributions from real estate fund investments		5,086		16,333
Realized and unrealized gains, net		43,233		123,150
Total revenues		49,329		141,341
Total expenses		8,107		25,108
Operating income (loss)		41,222		116,233
Unrealized gain (loss) on interest rate swaps		(477)		(673)
Interest and other income (loss), net		75		431
Interest and debt expense		(4,032)		(12,115)
Net income before income taxes		36,788		103,876
Net income		36,788		103,876
Net income attributable to noncontrolling interests		(33,248)		(86,381)
Net income (loss) attributable to common stockholders		3,540		17,495
Predecessor [Member] | Operating Segments [Member] | Management Company [Member]
Revenues
Fee and other income		21,976		49,886
Total revenues		21,976		49,886
Total expenses		11,136		34,861
Operating income (loss)		10,840		15,025
Income from unconsolidated joint ventures		17,726		43,584
Interest and other income (loss), net		15		18
Interest and debt expense				(39)
Net income before income taxes		28,581		58,588
Income tax expense		(820)		(7,925)
Net income		27,761		50,663
Net income (loss) attributable to common stockholders		27,761		50,663
Predecessor [Member] | Eliminations [Member]
Revenues
Fee and other income		(8,048)		(24,376)
Total revenues		(8,048)		(24,376)
Total expenses		(8,048)		(24,376)
Income from unconsolidated joint ventures		(17,726)		(43,584)
Net income before income taxes		(17,726)		(43,584)
Net income		(17,726)		(43,584)
Net income (loss) attributable to common stockholders		$ (17,726)		$ (43,584)