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Investments - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | May 31, 2017 | Dec. 31, 2010
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income from Equity Method Investments | $ 3,770,000 | $ 2,562,000 | $ 2,453,000 | $ 2,211,000 | $ 2,452,000 | $ 2,298,000 | $ 2,419,000 | $ 2,125,000 | $ 10,996,000 | $ 9,294,000 | $ 8,838,000 |  |
Equity Method Investment | 57,275,000 |  |  |  | 58,507,000 |  |  |  | 57,275,000 | 58,507,000 |  |  |
Amortization of Intangible Assets |  |  |  |  |  |  |  |  | 8,077,000 | 9,199,000 | 9,793,000 |  |
Net Realized and Unrealized Gains (Losses) on Private Equity Fund Investments, Including Performance Fees |  |  |  |  |  |  |  |  | (790,000) | (397,000) | (915,000) |  |
Previously Received Carried Interest Subject to Repayment | 0 |  |  |  |  |  |  |  | 0 |  |  |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets | 4,658,000 |  |  |  | 5,445,000 |  |  |  | 4,658,000 | 5,445,000 |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 8,810,000 |  |  |  | 8,048,000 |  |  |  | 8,810,000 | 8,048,000 |  |  |
Unfunded Commitments for Capital Contributions | 13,767,000 |  |  |  |  |  |  |  | 13,767,000 |  |  |  |
Equity Method Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Intangible Assets |  |  |  |  |  |  |  |  | 684,000 | 893,000 | 1,505,000 |  |
2015 Private Company Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount | 1,079,000 |  |  |  | 1,079,000 |  |  |  | 1,079,000 | 1,079,000 |  |  |
2019 Private Company Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount | $ 693,000 |  |  |  |  |  |  |  | 693,000 |  |  |  |
Investment Banking [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income from Equity Method Investments |  |  |  |  |  |  |  |  | $ 916,000 | 518,000 | 277,000 |  |
ABS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 46.00% |  |  |  |  |  |  |  | 46.00% |  |  |  |
Income from Equity Method Investments |  |  |  |  |  |  |  |  | $ 8,870,000 | 7,565,000 | 7,990,000 |  |
Equity Method Investment | $ 40,052,000 |  |  |  | 38,699,000 |  |  |  | $ 40,052,000 | 38,699,000 |  |  |
Atalanta Sosnoff [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 49.00% |  |  |  |  |  |  |  | 49.00% |  |  |  |
Income from Equity Method Investments |  |  |  |  |  |  |  |  | $ 1,210,000 | 1,211,000 | 493,000 |  |
Equity Method Investment | $ 12,300,000 |  |  |  | 13,291,000 |  |  |  | $ 12,300,000 | 13,291,000 |  |  |
Luminis [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 20.00% |  |  |  |  |  |  |  | 20.00% |  |  |  |
Income from Equity Method Investments |  |  |  |  |  |  |  |  | $ 916,000 | 518,000 | 499,000 |  |
Equity Method Investment | $ 4,923,000 |  |  |  | 6,517,000 |  |  |  | 4,923,000 | 6,517,000 |  |  |
G5 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income from Equity Method Investments |  |  |  |  |  |  |  |  |  |  | (144,000) |  |
Equity Method Investment |  |  |  |  |  |  |  |  |  |  |  | $ 11,555,000 |
Debt Securities, Held-to-maturity | 9,235,000 |  |  |  | 9,717,000 |  |  |  | 9,235,000 | 9,717,000 |  |  |
G5 [Member] | Special Charges [Member] | Investment Banking [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Other than Temporary Impairment |  |  |  |  |  |  |  |  |  |  | $ 14,400,000 |  |
Trilantic VI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment | 3,015,000 |  |  |  |  |  |  |  | 3,015,000 |  |  |  |
Capital Commitment | 12,000,000 |  |  |  |  |  |  |  | 12,000,000 |  |  |  |
Unfunded Commitments for Capital Contributions | 9,164,000 |  |  |  |  |  |  |  | 9,164,000 |  |  |  |
Other Ownership Interests, Contributed Capital | 2,836,000 |  |  |  |  |  |  |  | 2,836,000 |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  | 1,178,000 |  |  |  |  | 1,178,000 |  |  |
Distribution Made to Limited Partner, Cash Distributions Paid |  |  |  |  |  |  |  |  |  | 194,000 |  |  |
Trilantic V [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment | 155,000 |  |  |  | 4,980,000 |  |  |  | 155,000 | 4,980,000 |  |  |
Distribution Made to Limited Partner, Cash Distributions Paid |  |  |  |  |  |  |  |  |  | 1,549,000 |  |  |
Capital Commitment | 5,000,000 |  |  |  |  |  |  |  | 5,000,000 |  |  |  |
Unfunded Commitments for Capital Contributions | 391,000 |  |  |  |  |  |  |  | 391,000 |  |  |  |
Trilantic [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment | 6,762,000 |  |  |  | 9,932,000 |  |  |  | 6,762,000 | 9,932,000 |  |  |
Issued LP Units (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 500,000
Limited Partnership Investment |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,090,000
Glisco [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount | $ 899,000 |  |  |  | $ 1,609,000 |  |  |  | $ 899,000 | $ 1,609,000 |  |  |

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