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Fair Value Measurements - Additional Information (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities owned, at fair value | $ 837,584,000 | $ 926,597,000
ARS Valuation Adjustment For Level Two and Three Assets | $ 3,794,000 |
Loan position held in secondary loan trading portfolio |  | 0
Forward or delayed delivery of the underlying instrument with settlement | 180 days |
Equity Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities owned, at fair value | $ 28,215,000 | 34,067,000
Auction rate securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities owned, at fair value | 37,952,000 | 111,853,000
Auction Rate Securities Owned |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
ARS Valuation Adjustment For Level Two and Three Assets | 2,698,000 |
Auction rate securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total amount of ARS the firm purchased and hold | 40,700,000 |
Amount of ARS committed to purchase from clients | 7,300,000 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net | $ (37,675,000) | (24,455,000)
Auction rate securities | Maximum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Commitment to purchase ARS period maximum | 2020 |
Hedge Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment Redemption Notice Period Minimum | 30 days |
Investment Redemption Notice Period Maximum | 120 days |
Private Equity Funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments Lock In Period | 10 years |
Auction Rate Preferred Securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
U S Treasury Rate | 2.60% |
Auction Rate Preferred Securities | Minimum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Spread To U S Treasury Rate | 110.00% |
Auction Rate Preferred Securities | Minimum [Member] | Auction Rate Securities Owned |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value Input, Discount Rate | 2.86% |
Fair Value Unobservable Input Current Yield | 2.69% |
Auction Rate Preferred Securities | Maximum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Spread To U S Treasury Rate | 150.00% |
Auction Rate Preferred Securities | Maximum [Member] | Auction Rate Securities Purchase Commitment |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value Unobservable Input Current Yield | 4.05% |
Auction Rate Preferred Securities | Maximum [Member] | Auction Rate Securities Owned |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value Input, Discount Rate | 3.89% |
Student Loan Auction Rate Securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Spread To U S Treasury Rate | 1.20% |
U S Treasury Rate | 2.48% |
Student Loan Auction Rate Securities | Auction Rate Securities Owned |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value Input, Discount Rate | 3.68% |
Fair Value Unobservable Input Current Yield | 3.64% |
Auction Rate Securities Purchase Commitment |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Valuation Adjustment For Level Two Assets | $ 1,096,000 |
Fair Value, Valuation Scenario One [Member] | Auction rate securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Basis point | 25.00% |
Decrease in fair value of ARS | $ 22,000,000 |
Fair Value, Valuation Scenario Two | Auction rate securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Basis point | 50.00% |
Decrease in fair value of ARS | $ 76,000,000 |
Other Assets | Auction Rate Preferred Securities | Minimum [Member] | Auction Rate Securities Purchase Commitment |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value Input, Discount Rate | 2.86% |
Fair Value Unobservable Input Current Yield | 2.69% |
Other Assets | Auction Rate Preferred Securities | Maximum [Member] | Auction Rate Securities Purchase Commitment |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value Input, Discount Rate | 3.89% |
Fair Value Unobservable Input Current Yield | 4.05% |
Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities owned, at fair value | $ 129,643,000 |
Level 2 | Auction rate securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities owned, at fair value | $ 16,253,000 | $ 24,455,000

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