Segments Disclosure - Schedule of Each Reportable Segment Information of Predecessor (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended								11 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	Nov. 23, 2014	Dec. 31, 2016	Dec. 31, 2015
Revenues
Rental income	$ 57,465										$ 590,161	$ 586,530
Tenant reimbursement income	5,865										44,943	50,885
Fee and other income	2,805										48,237	24,993
Total revenues	66,135	$ 166,802	$ 171,318	$ 172,303	$ 172,918	$ 170,528	$ 167,726	$ 162,928	$ 161,226		683,341	662,408
Total expenses	62,699										575,404	591,789
Operating income	3,436										107,937	70,619
Income from unconsolidated joint ventures	938										7,413	6,850
Unrealized gain (loss) on interest rate swaps	15,084										39,814	75,760
Interest and other income, net	(179)										6,934	871
Interest and debt expense	(43,743)										(157,746)	(168,366)
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
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)
Predecessor [Member]
Revenues
Rental income										$ 30,208
Tenant reimbursement income										1,646
Distributions from real estate fund investments										17,083
Realized and unrealized gains, net										129,354
Fee and other income										49,098
Total revenues										227,389
Total expenses										76,992
Operating income										150,397
Income from unconsolidated joint ventures										4,241
Unrealized gain (loss) on interest rate swaps										(673)
Interest and other income, net										2,479
Interest and debt expense										(28,585)
Net income before income taxes										127,859
Income tax expense										(18,461)
Net income										109,398
Net income attributable to noncontrolling interests										(87,888)
Net (loss) income attributable to common stockholders										21,510
Predecessor [Member] | Operating Segments [Member] | Owned Properties [Member]
Revenues
Rental income										27,774
Tenant reimbursement income										1,646
Total revenues										29,420
Total expenses										20,553
Operating income										8,867
Income from unconsolidated joint ventures										4,241
Interest and other income, net										2,004
Interest and debt expense										(11,157)
Net income before income taxes										3,955
Net income										3,955
Net (loss) income attributable to common stockholders										3,955
Predecessor [Member] | Operating Segments [Member] | Managed Funds [Member]
Revenues
Rental income										2,434
Distributions from real estate fund investments										17,083
Realized and unrealized gains, net										129,354
Total revenues										148,871
Total expenses										27,995
Operating income										120,876
Unrealized gain (loss) on interest rate swaps										(673)
Interest and other income, net										388
Interest and debt expense										(17,323)
Net income before income taxes										103,268
Net income										103,268
Net income attributable to noncontrolling interests										(87,888)
Net (loss) income attributable to common stockholders										15,380
Predecessor [Member] | Operating Segments [Member] | Management Company [Member]
Revenues
Fee and other income										74,686
Total revenues										74,686
Total expenses										54,032
Operating income										20,654
Income from unconsolidated joint ventures										48,683
Interest and other income, net										87
Interest and debt expense										(105)
Net income before income taxes										69,319
Income tax expense										(18,461)
Net income										50,858
Net (loss) income attributable to common stockholders										50,858
Predecessor [Member] | Eliminations [Member]
Revenues
Fee and other income										(25,588)
Total revenues										(25,588)
Total expenses										(25,588)
Income from unconsolidated joint ventures										(48,683)
Net income before income taxes										(48,683)
Net income										(48,683)
Net (loss) income attributable to common stockholders										$ (48,683)