Investments - Additional Information (Details) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 07, 2021 USD ($) director	Dec. 31, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Mar. 28, 2022	Jan. 31, 2022
Schedule of Investments [Line Items]
Income from Equity Method Investments			$ 2,027	$ 3,681	$ 6,813	$ 10,099
Debt Securities, Gain (Loss)			1,013	26	1,541	17
Net Realized and Unrealized Gains (Losses) on Private Equity Fund Investments			308	(460)	244	(438)
Previously Received Carried Interest Subject to Repayment			658		658
Total Assets		$ 3,802,657	3,151,269	3,271,888	3,151,269	3,271,888
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount		5,715	5,395		5,395
Special Charges, Including Business Realignment Costs			0	8,554	532	8,554
Equity Securities without Readily Determinable Fair Value, Amount		676	557		557
Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Investments [Line Items]
Total Assets		3,408	3,107		3,107
Equity Method Investments [Member]
Schedule of Investments [Line Items]
Amortization of Intangible Assets			$ 79	79	$ 237	237
ABS [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage			26.00%		26.00%		26.00%	46.00%
Proceeds from Sale of Equity Method Investments					$ 18,300
Income from Equity Method Investments			$ 1,043	2,234	3,413	6,724
ABS [Member] | Other Revenue, Including Interest and Investments
Schedule of Investments [Line Items]
Equity Method Investment, Realized Gain (Loss) on Disposal					$ 1,294
Atalanta Sosnoff [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage			49.00%		49.00%
Income from Equity Method Investments			$ 533	883	$ 2,411	2,093
Luminis [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage			20.00%		20.00%
Income from Equity Method Investments			$ 397	$ 564	$ 787	1,282
Seneca Evercore [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage	20.00%
Income from Equity Method Investments			$ 54		$ 202
Payments to Acquire Equity Method Investments	$ 500
Number of Directors | director	1
G5 [Member] | Other Revenue, Including Interest and Investments
Schedule of Investments [Line Items]
Debt Securities, Gain (Loss)						$ 4,374
Trilantic VI [Member]
Schedule of Investments [Line Items]
Proceeds from Sale of Equity Method Investments		9,188
Glisco [Member]
Schedule of Investments [Line Items]
Equity Securities without Readily Determinable Fair Value, Amount		$ 221