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Amount of investment in equity securities without readily determinable fair value

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This item represents the carrying amount on the entity's balance sheet of its investment.

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Net realized and unrealized gains (losses) on private equity fund investments, including performance fees

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Participation in Successor Funds

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Percent Ownership of Carried Interest

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Previously received carried interest subject to repayment.

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- Definition

Unfunded commitments for capital contributions

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of cash distribution paid to unit-holder of limited partnership (LP).

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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The number of limited partner units issued.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

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Investments - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2010
Schedule of Investments [Line Items]
Income from Equity Method Investments	$ 2,298,000	$ 1,827,000	$ 6,842,000	$ 5,507,000
Equity Method Investment	57,323,000		57,323,000		$ 59,856,000
Marketable Securities	211,128,000		211,128,000		65,032,000
Net Realized and Unrealized Gains (Losses) on Private Equity Fund Investments, Including Performance Fees	(337,000)	1,208,000	(195,000)	(985,000)
Previously Received Carried Interest Subject to Repayment	0		0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	5,277,000		5,277,000		8,730,000
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	7,880,000		7,880,000		10,996,000
Unfunded Commitments for Capital Contributions	3,294,000		3,294,000
Equity Securities without Readily Determinable Fair Value, Amount	1,079,000		1,079,000		1,079,000
Private Equity Funds [Member]
Schedule of Investments [Line Items]
Equity Method Investment	$ 9,710,000		$ 9,710,000		13,812,000
ABS [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage	46.00%		46.00%
Income from Equity Method Investments	$ 1,997,000	1,676,000	$ 5,760,000	4,919,000
Equity Method Investment	$ 37,634,000		$ 37,634,000		39,894,000
Atalanta Sosnoff [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage	49.00%		49.00%
Income from Equity Method Investments	$ 301,000	190,000	$ 785,000	621,000
Equity Method Investment	$ 13,393,000		$ 13,393,000		13,963,000
Luminis [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage	19.00%		19.00%
Income from Equity Method Investments		54,000	$ 297,000	111,000
Equity Method Investment	$ 6,296,000		6,296,000		5,999,000
Equity Method Investments [Member]
Schedule of Investments [Line Items]
Amortization of Intangible Assets	223,000	$ 391,000	669,000	$ 1,172,000
G5 [Member]
Schedule of Investments [Line Items]
Held-to-maturity Securities	9,305,000		9,305,000		10,995,000
Glisco IV [Member] \| Private Equity Funds [Member]
Schedule of Investments [Line Items]
Equity Method Investment	45,000		$ 45,000
ECP II [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member] \| Minimum [Member]
Schedule of Investments [Line Items]
Percent Ownership of Carried Interest			8.00%
ECP II [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member] \| Maximum [Member]
Schedule of Investments [Line Items]
Percent Ownership of Carried Interest			9.00%
ECP II [Member] \| Private Equity Funds [Member]
Schedule of Investments [Line Items]
Equity Method Investment	796,000		$ 796,000		833,000
Cash	788,000		788,000
Marketable Securities	8,000		8,000
Glisco II [Member]
Schedule of Investments [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid			2,059,000
Trilantic IV [Member]
Schedule of Investments [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid			194,000
Investment					1,178,000
Trilantic V [Member]
Schedule of Investments [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid			1,549,000
Investment	417,000		417,000		4,513,000
Capital Commitment	5,000,000		5,000,000
Unfunded Commitments for Capital Contributions	632,000		632,000
Trilantic [Member]
Schedule of Investments [Line Items]
Issued LP Units (in shares)						500,000
Limited Partnership Investment						$ 16,090,000
Investment	9,982,000		9,982,000		10,399,000
Participation in Successor Funds	12,000,000		12,000,000
Glisco [Member]
Schedule of Investments [Line Items]
Equity Securities without Readily Determinable Fair Value, Amount	$ 1,609,000		$ 1,609,000		$ 2,172,000