Investments Of Operating Entities And Consolidated Funds - Operating Entities - Receivable On And Payable For Derivative Contracts, At Fair Value (Details)		Dec. 31, 2021 USD ($) contract	Dec. 31, 2020 USD ($) contract
Derivative [Line Items]
Receivable on derivative contracts, at fair value		$ 286,135,000	$ 51,482,000
Payable for derivative contracts, at fair value		60,163,000	76,160,000
Receivable on derivatives contracts, at fair value [Member]
Derivative [Line Items]
Receivable on derivative contracts, at fair value		286,135,000	51,482,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	[1],[2]	(81,742,000)	(62,269,000)
Payable for derivatives contracts, at fair value [Member]
Derivative [Line Items]
Payable for derivative contracts, at fair value		60,163,000	76,160,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	[1],[2]	(92,330,000)	(37,033,000)
Futures
Derivative [Line Items]
Derivative Liability, Notional Amount		9,378,000	0
Payable for derivative contracts, at fair value		266,000	0
Currency Forwards
Derivative [Line Items]
Derivative Asset, Notional Amount		10,727,000	4,902,000
Receivable on derivative contracts, at fair value		80,000	15,000
Derivative Liability, Notional Amount		149,575,000	123,346,000
Payable for derivative contracts, at fair value		1,346,000	3,067,000
Equity Swaps
Derivative [Line Items]
Derivative Asset, Notional Amount		2,235,181,000	944,544,000
Receivable on derivative contracts, at fair value		306,578,000	64,634,000
Derivative Liability, Notional Amount		988,329,000	896,863,000
Payable for derivative contracts, at fair value		$ 114,689,000	$ 43,560,000
Options (held long)
Derivative [Line Items]
Derivative Asset, Number of Instruments Held | contract	[3]	217,393	371,188
Receivable on derivative contracts, at fair value	[3]	$ 61,219,000	$ 49,102,000
Options (held short)
Derivative [Line Items]
Derivative Liability, Number of Instruments Held | contract	[3]	182,440	198,320
Payable for derivative contracts, at fair value	[3]	$ 36,192,000	$ 66,566,000

[1] Derivatives are reported on a net basis, by counterparty, when a legal right of offset exists under an enforceable netting agreement as well as net of cash collateral received or posted under enforceable credit support agreements. See Note 2f for further information on offsetting of derivative financial instruments.

[2] Includes financial instruments subject to enforceable master netting provisions that are permitted to be offset to the extent an event of default has occurred

[3] Includes the volume of contracts for index, equity, commodity future and cash conversion options.