Redeemable Non-Controlling Interests in Consolidated Subsidiaries and Funds (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Noncontrolling Interest [Line Items]
Redeemable non-controlling interests in consolidated subsidiaries and funds	$ 324,938		$ 186,911
Net income (loss) attributable to redeemable non-controlling interests in consolidated subsidiaries and funds	(4,297)	$ 2,720
Operating Entities
Noncontrolling Interest [Line Items]
Redeemable non-controlling interests in consolidated subsidiaries and funds	8,561		10,906
Net income (loss) attributable to redeemable non-controlling interests in consolidated subsidiaries and funds	(78)	918
Consolidated Funds
Noncontrolling Interest [Line Items]
Redeemable non-controlling interests in consolidated subsidiaries and funds	316,377		$ 176,005
Net income (loss) attributable to redeemable non-controlling interests in consolidated subsidiaries and funds	$ (4,219)	$ 1,802