Investments Of Operating Entities And Consolidated Funds - Operating Entities - Receivable On And Payable For Derivative Contracts, At Fair Value (Details)		Mar. 31, 2022 USD ($) contract	Dec. 31, 2021 USD ($) contract
Derivative [Line Items]
Receivable on derivative contracts, at fair value		$ 342,712,000	$ 286,135,000
Payable for derivative contracts, at fair value		46,814,000	60,163,000
Receivable on derivatives contracts, at fair value [Member]
Derivative [Line Items]
Receivable on derivative contracts, at fair value		342,712,000	286,135,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	[1],[2]	(115,912,000)	(81,742,000)
Payable for derivatives contracts, at fair value [Member]
Derivative [Line Items]
Payable for derivative contracts, at fair value		46,814,000	60,163,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	[1],[2]	(131,802,000)	(92,330,000)
Futures
Derivative [Line Items]
Derivative Liability, Notional Amount		2,567,000	9,378,000
Payable for derivative contracts, at fair value		53,000	266,000
Currency Forwards
Derivative [Line Items]
Derivative Asset, Notional Amount		11,482,000	10,727,000
Receivable on derivative contracts, at fair value		109,000	80,000
Derivative Liability, Notional Amount		138,530,000	149,575,000
Payable for derivative contracts, at fair value		1,084,000	1,346,000
Equity Swaps
Derivative [Line Items]
Derivative Asset, Notional Amount		2,077,076,000	1,950,181,000
Receivable on derivative contracts, at fair value		388,875,000	305,370,000
Derivative Liability, Notional Amount		825,229,000	988,329,000
Payable for derivative contracts, at fair value		$ 152,265,000	$ 114,689,000
Options (held long)
Derivative [Line Items]
Derivative Asset, Number of Instruments Held | contract	[3]	120,847	217,393
Receivable on derivative contracts, at fair value	[3]	$ 49,801,000	$ 61,219,000
Options (held short)
Derivative [Line Items]
Derivative Liability, Number of Instruments Held | contract	[3]	117,871	182,440
Payable for derivative contracts, at fair value	[3]	$ 25,214,000	$ 36,192,000
Interest rate swap
Derivative [Line Items]
Derivative Asset, Number of Instruments Held | contract	[4]	427,000,000	285,000,000
Receivable on derivative contracts, at fair value	[4]	$ 19,839,000	$ 1,208,000

[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.

[4] Interest rate swap offsetting the Company's floating rate debt on the Company's term loan. See Note 12