Investments of Operating Entities and Consolidated Funds - Operating Entities - Gross Obligations For Securities Loaned And Securities Sold Under Agreements To Repurchase (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Common stock	$ 1,735,852,000	$ 1,586,572,000
Securities Purchased under Agreements to Resell	19,621,000	0
Securities sold, not yet purchased, at fair value	974,867,000	1,201,448,000
Corporate Bonds
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Common stock	7,274,000	15,737,000
Securities Purchased under Agreements to Resell	19,621,000
Securities sold, not yet purchased, at fair value	186,119,000
Corporate Bonds | Open and Overnight
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Common stock	7,274,000	15,737,000
Securities Purchased under Agreements to Resell	19,621,000
Securities sold, not yet purchased, at fair value	186,119,000
Corporate Bonds | Up to 30 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Common stock	0	0
Securities Purchased under Agreements to Resell	0
Securities sold, not yet purchased, at fair value	0
Corporate Bonds | 31 - 90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Common stock	0	0
Securities Purchased under Agreements to Resell	0
Securities sold, not yet purchased, at fair value	0
Corporate Bonds | Greater than 90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Common stock	0	0
Securities Purchased under Agreements to Resell	0
Securities sold, not yet purchased, at fair value	0
Common Stock
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Common stock	1,728,578,000	1,570,835,000
Securities sold, not yet purchased, at fair value	43,073,000	63,469,000
Common Stock | Open and Overnight
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Common stock	1,728,578,000	1,570,835,000
Securities sold, not yet purchased, at fair value	0	0
Common Stock | Up to 30 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Common stock	0	0
Securities sold, not yet purchased, at fair value	43,073,000	20,906,000
Common Stock | 31 - 90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Common stock	0	0
Securities sold, not yet purchased, at fair value	0	42,563,000
Common Stock | Greater than 90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Common stock	0	0
Securities sold, not yet purchased, at fair value	$ 0	$ 0