Investments - Additional Information (Details)		1 Months Ended		12 Months Ended
	Jul. 07, 2021 USD ($) director	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2010 USD ($) shares
Schedule of Investments [Line Items]
Income from Equity Method Investments				$ 14,161,000	$ 14,398,000	$ 10,996,000
Amortization of Intangible Assets				362,000	1,605,000	8,077,000
Net Realized and Unrealized Gains (Losses) on Private Equity Fund Investments				(1,059,000)	(1,388,000)	(790,000)
Previously Received Carried Interest Subject to Repayment			$ 785,000	785,000
Total Assets			3,802,657,000	3,802,657,000	3,370,888,000	2,598,613,000
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount			5,715,000	5,715,000	5,572,000
Unfunded Commitments for Capital Contributions			6,123,000	6,123,000
Special Charges, Including Business Realignment Costs				8,554,000	46,645,000	10,141,000
Equity Securities without Readily Determinable Fair Value, Amount			676,000	676,000	683,000
Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Investments [Line Items]
Total Assets			$ 3,408,000	3,408,000	3,083,000
Equity Method Investments [Member]
Schedule of Investments [Line Items]
Amortization of Intangible Assets				$ 316,000	316,000	684,000
ABS [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage			46.00%	46.00%
Income from Equity Method Investments				$ 10,524,000	10,855,000	8,870,000
ABS [Member] | Subsequent Event [Member]
Schedule of Investments [Line Items]
Proceeds from Sale of Equity Method Investments		$ 1,000,000
Equity Method Investment, Percent Sold		1.00%
ABS [Member] | Subsequent Event [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage		26.00%
Atalanta Sosnoff [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage			49.00%	49.00%
Income from Equity Method Investments				$ 2,300,000	1,997,000	1,210,000
Luminis [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage			20.00%	20.00%
Income from Equity Method Investments				$ 1,334,000	1,546,000	$ 916,000
Seneca Evercore [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage	20.00%
Income from Equity Method Investments				3,000
Payments to Acquire Equity Method Investments	$ 500,000
Number of Directors | director	1
G5 [Member]
Schedule of Investments [Line Items]
Debt Securities, Held-to-maturity					7,385,000
G5 [Member] | Other Income
Schedule of Investments [Line Items]
Debt Securities, Gain (Loss)				4,374,000
Trilantic [Member]
Schedule of Investments [Line Items]
Issued LP Units (in shares) | shares							500,000
Limited Partnership Investment							$ 16,090,000
Trilantic V [Member]
Schedule of Investments [Line Items]
Capital Commitment			$ 5,000,000	5,000,000
Unfunded Commitments for Capital Contributions			336,000	336,000
Trilantic VI [Member]
Schedule of Investments [Line Items]
Proceeds from Sale of Equity Method Investments			9,188,000
Capital Commitment			12,000,000	12,000,000
Unfunded Commitments for Capital Contributions			3,420,000	3,420,000
Glisco [Member]
Schedule of Investments [Line Items]
Equity Securities without Readily Determinable Fair Value, Amount			$ 221,000	$ 221,000	$ 387,000