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Significant Accounting Policies (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Investment Banking And Investment Management Receivables Collection Periods |  |  |  | 90 days |  |
Placement Fees Receivables Collection Period |  |  |  | 180 days |  |
Private Funds Capital Raising Receivables Collection Period |  |  |  | 1 year |  |
Collection Period For Restructuring Transactions And Private Equity Fee Receivables |  |  |  | 90 days |  |
Receivables Reflected in Other Assets in Excess of Period |  |  |  | 1 year |  |
Contract Asset Recognized in Benefit in Excess of Period |  |  |  | 1 year |  |
Other Operating Expenses | [1] | $ 6,882 | $ 7,191 | $ 20,657 | $ 18,224 |
Professional Fees | [1] | 19,698 | 15,836 | 56,581 | 42,489 |
Net Realized and Unrealized Gains on Private Equity Fund Investments |  | (337) | 1,208 | (195) | (985) |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Consolidated Assets |  | 116,866 |  | 116,866 |  | $ 126,078
Consolidated Liabilities |  | $ 75,482 |  | $ 75,482 |  | $ 102,487
Execution, Clearing and Custody Fees [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Other Operating Expenses |  |  | 3,140 |  | 10,029 |
Professional Fees |  |  | 315 |  | 943 |
Other Revenue, Including Interest and Investments [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Principal Trading Losses |  |  | (343) |  | (606) |
Net Realized and Unrealized Gains on Private Equity Fund Investments |  |  | $ 1,952 |  | $ 1,427 |
[1] | Certain balances in the prior period were reclassified to conform to their current presentation. See Note 2 for further information.

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