Redeemable Non-Controlling Interests in Consolidated Subsidiaries and Funds (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Noncontrolling Interest [Line Items]
Redeemable non-controlling interests in consolidated subsidiaries and funds	$ 331,883		$ 331,883		$ 186,911
Net income (loss) attributable to redeemable non-controlling interests in consolidated subsidiaries and funds	18,478	$ 4,344	(2,524)	$ 10,980
Operating Entities
Noncontrolling Interest [Line Items]
Redeemable non-controlling interests in consolidated subsidiaries and funds	6,791		6,791		10,906
Net income (loss) attributable to redeemable non-controlling interests in consolidated subsidiaries and funds	1,433	4,577	2,880	8,669
Consolidated Funds
Noncontrolling Interest [Line Items]
Redeemable non-controlling interests in consolidated subsidiaries and funds	325,092		325,092		$ 176,005
Net income (loss) attributable to redeemable non-controlling interests in consolidated subsidiaries and funds	$ 17,045	$ (233)	$ (5,404)	$ 2,311