Non-Controlling Interests in Consolidated Subsidiaries and Funds (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Noncontrolling Interest [Line Items]
Redeemable non-controlling interests in consolidated subsidiaries and funds	$ 318,001		$ 391,275
Nonredeemable Noncontrolling Interest	456,242		485,595
Net Income (Loss) Attributable to Noncontrolling Interest	(62,188)	$ 512
Operating Entities
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Interest	11,463		11,513
Net Income (Loss) Attributable to Noncontrolling Interest	127	112
Consolidated Funds
Noncontrolling Interest [Line Items]
Redeemable non-controlling interests in consolidated subsidiaries and funds	318,001		391,275
Nonredeemable Noncontrolling Interest	126,778		$ 82,807
Net Income (Loss) Attributable to Noncontrolling Interest	$ (62,315)	$ 400