Segments Disclosure - Schedule of Each Reportable Segment Information of Predecessor (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues
Rental income	$ 143,243
Tenant reimbursement income	13,488
Fee and other income	4,495
Total revenues	161,226
Total expenses	148,080
Operating income	13,146
Income from partially owned entities	975
Unrealized gains on interest rate swaps	11,978
Interest and other income, net	854
Interest and debt expense	(41,888)
Net income (loss) before income taxes	(10,853)
Income tax expense	(574)
Net income (loss)	(11,427)
Net income (loss)	(9,731)
Owned Properties [Member]
Revenues
Rental income	142,477
Tenant reimbursement income	13,488
Fee and other income	2,955
Total revenues	158,920
Total expenses	135,651
Operating income	23,269
Income from partially owned entities	940
Unrealized gains on interest rate swaps	11,978
Interest and other income, net	94
Interest and debt expense	(39,132)
Net income (loss) before income taxes	(2,851)
Income tax expense	(460)
Net income (loss)	(3,311)
Predecessor [Member]
Revenues
Rental income		7,813
Tenant reimbursement income		455
Distributions from real estate fund investments		6,503
Realized and unrealized gains, net		46,167
Fee and other income		5,182
Total revenues		66,120
Total expenses		20,352
Operating income		45,768
Income from partially owned entities		1,132
Unrealized gains on interest rate swaps		158
Interest and other income, net		709
Interest and debt expense		(7,799)
Net income (loss) before income taxes		39,968
Income tax expense		(3,263)
Net income (loss)		36,705
Net income attributable to noncontrolling interests		(27,310)
Net income (loss)		9,395
Predecessor [Member] | Operating Segments [Member] | Owned Properties [Member]
Revenues
Rental income		7,651
Tenant reimbursement income		455
Total revenues		8,106
Total expenses		6,825
Operating income		1,281
Income from partially owned entities		1,132
Interest and other income, net		663
Interest and debt expense		(3,785)
Net income (loss) before income taxes		(709)
Net income (loss)		(709)
Net income (loss)		(709)
Predecessor [Member] | Operating Segments [Member] | Managed Funds [Member]
Revenues
Rental income		162
Distributions from real estate fund investments		6,503
Realized and unrealized gains, net		46,167
Total revenues		52,832
Total expenses		10,526
Operating income		42,306
Unrealized gains on interest rate swaps		158
Interest and other income, net		46
Interest and debt expense		(4,014)
Net income (loss) before income taxes		38,496
Net income (loss)		38,496
Net income attributable to noncontrolling interests		(27,310)
Net income (loss)		11,186
Predecessor [Member] | Operating Segments [Member] | Management Company [Member]
Revenues
Fee and other income		13,773
Total revenues		13,773
Total expenses		11,592
Operating income		2,181
Income from partially owned entities		14,290
Net income (loss) before income taxes		16,471
Income tax expense		(3,263)
Net income (loss)		13,208
Net income (loss)		13,208
Predecessor [Member] | Eliminations [Member]
Revenues
Fee and other income		(8,591)
Total revenues		(8,591)
Total expenses		(8,591)
Income from partially owned entities		(14,290)
Net income (loss) before income taxes		(14,290)
Net income (loss)		(14,290)
Net income (loss)		$ (14,290)