Fair Value Measurements - Summary of Changes in Fair Value of Real Estate Fund Investments in Level 3 (Details) - Real Estate Fund [Member] - Level 3 [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 335,545		$ 323,387
Purchases	40,096		40,118
Sales	(42,475)		(42,475)
Net realized gains	7,455		7,455
Previously recorded unrealized gains on exited investments	(6,790)		(6,058)
Net unrealized gains	2,562		13,966
Ending Balance	$ 336,393		$ 336,393
Predecessor [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance		$ 2,402,987		$ 2,158,889
Purchases		91,995		256,176
Sales		(221,661)		(221,661)
Net realized gains		33,432		33,432
Net unrealized gains		9,801		89,718
Ending Balance		$ 2,316,554		$ 2,316,554