Redeemable Noncontrolling Interests - Schedule of Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Balance at beginning of period	$ 63,845
Net income (loss) attributable to noncontrolling interests	6,976
Total net income (loss) attributable to noncontrolling interests	38,708	$ 10,886	$ 515
Net subscriptions (redemptions) and other	12,960
Balance at end of period	115,513	63,845
CIP
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Balance at beginning of period	5,429
Net income (loss) attributable to noncontrolling interests	997
Changes in redemption value	17,137	(13,926)	$ 56
Total net income (loss) attributable to noncontrolling interests	997
Net subscriptions (redemptions) and other	21,635
Balance at end of period	28,061	5,429
Affiliate Noncontrolling Interests
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Balance at beginning of period	58,416
Net income (loss) attributable to noncontrolling interests	5,979
Total net income (loss) attributable to noncontrolling interests	37,711
Net subscriptions (redemptions) and other	(8,675)
Balance at end of period	87,452	$ 58,416
Portion at Other than Fair Value Measurement
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Changes in redemption value	31,732
Portion at Other than Fair Value Measurement | CIP
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Changes in redemption value	0
Portion at Other than Fair Value Measurement | Affiliate Noncontrolling Interests
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Changes in redemption value	$ 31,732