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Fair Value Measurements - Additional Information (Narrative) (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Level Three Principal Amount | $ 104,462,000 |
Securities owned, at fair value | $ 1,020,404,000 | $ 926,597,000
Forward or delayed delivery of the underlying instrument with settlement | 180 days |
Valuation Adjustment For Level Three Asset and Liability | $ 2,299,000 |
Fair Value Of Level Three Assets and Liabilities | 102,163,000 |
Equity Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities owned, at fair value | 33,112,000 | 34,067,000
Auction rate securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Level Three Principal Amount | 92,300,000 |
Auction Rate Securities Committed To Purchase related to settlements with regulators | 5,000,000 |
Securities owned, at fair value | 90,223,000 | $ 111,853,000
Valuation adjustment (unrealized loss) for ARS | (2,077,000) |
Total amount of ARS the firm purchased and hold | 92,300,000 |
Fair Value Of Level Three Assets | $ 90,223,000 |
Maximum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities Committed To Purchase Period | 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 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments Lock In Period | 10 years |
Fair Value, Valuation Scenario One [Member] | Auction rate securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Basis point | 25.00% |
Fair Value, Valuation Scenario Two [Member] | Auction rate securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Basis point | 50.00% |
Municipal Auction Rate Securities [Member] | Auction rate securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Level Three Principal Amount | $ 25,000 |
Valuation adjustment (unrealized loss) for ARS | 0 |
Fair Value Of Level Three Assets | $ 25,000 |
Fair Value Measurements, Valuation Techniques | Par |
Auction Rate Preferred Securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
U S Treasury Rate | 2.58% |
Auction Rate Preferred Securities | Auction rate securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Level Three Principal Amount | $ 73,275,000 |
Fair Value Unobservable Inputs Duration | 2 years 6 months |
Valuation adjustment (unrealized loss) for ARS | $ (941,000) |
Fair Value Of Level Three Assets | $ 72,334,000 |
Fair Value Measurements, Valuation Techniques | Discounted Cash Flow |
Auction Rate Preferred Securities | Weighted Average [Member] | Auction rate securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Permanent and construction loans , discount rate | 3.22% |
Fair Value Unobservable Inputs Duration | 2 years 6 months |
Fair Value Unobservable Input Current Yield | 2.68% |
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 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Permanent and construction loans , discount rate | 2.83% |
Fair Value Unobservable Input Current Yield | 2.36% |
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 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Permanent and construction loans , discount rate | 3.86% |
Fair Value Unobservable Input Current Yield | 3.21% |
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 | 2.76% |
Student Loan Auction Rate Securities | Auction rate securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Level Three Principal Amount | $ 275,000 |
Permanent and construction loans , discount rate | 3.96% |
Fair Value Unobservable Inputs Duration | 5 years 6 months |
Valuation adjustment (unrealized loss) for ARS | $ (13,000) |
Fair Value Unobservable Input Current Yield | 2.95% |
Fair Value Of Level Three Assets | $ 262,000 |
Fair Value Measurements, Valuation Techniques | Discounted Cash Flow |
Student Loan Auction Rate Securities | Weighted Average [Member] | Auction rate securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Permanent and construction loans , discount rate | 3.96% |
Fair Value Unobservable Inputs Duration | 5 years 6 months |
Fair Value Unobservable Input Current Yield | 2.95% |
ARS purchase commitments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Level Three Principal Amount | $ 12,162,000 |
Amount of ARS committed to purchase from clients | 7,200,000 |
Valuation Adjustment For Level Three Liabilities | 222,000 |
Fair Value Of Level Three Liabilities | 11,940,000 |
ARS purchase commitments | Municipal Auction Rate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Level Three Principal Amount | $ 2,000 |
Fair Value Measurements, Valuation Techniques | Par |
Valuation Adjustment For Level Three Liabilities | $ 0 |
Fair Value Of Level Three Liabilities | 2,000 |
ARS purchase commitments | Auction Rate Preferred Securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Level Three Principal Amount | $ 10,620,000 |
Fair Value Unobservable Inputs Duration | 2 years 6 months |
Fair Value Measurements, Valuation Techniques | Discounted Cash Flow |
Valuation Adjustment For Level Three Liabilities | $ 130,000 |
Fair Value Of Level Three Liabilities | $ 10,490,000 |
ARS purchase commitments | Auction Rate Preferred Securities | Weighted Average [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Permanent and construction loans , discount rate | 3.22% |
Fair Value Unobservable Inputs Duration | 2 years 6 months |
Fair Value Unobservable Input Current Yield | 2.68% |
ARS purchase commitments | Auction Rate Preferred Securities | Minimum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Permanent and construction loans , discount rate | 2.83% |
Fair Value Unobservable Input Current Yield | 2.36% |
ARS purchase commitments | Auction Rate Preferred Securities | Maximum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Permanent and construction loans , discount rate | 3.86% |
Fair Value Unobservable Input Current Yield | 3.21% |
ARS purchase commitments | Student Loan Auction Rate Securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Level Three Principal Amount | $ 25,000 |
Permanent and construction loans , discount rate | 3.96% |
Fair Value Unobservable Inputs Duration | 5 years 6 months |
Fair Value Unobservable Input Current Yield | 2.95% |
Fair Value Measurements, Valuation Techniques | Discounted Cash Flow |
Valuation Adjustment For Level Three Liabilities | $ 1,000 |
Fair Value Of Level Three Liabilities | $ 24,000 |
ARS purchase commitments | Student Loan Auction Rate Securities | Weighted Average [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Permanent and construction loans , discount rate | 3.96% |
Fair Value Unobservable Inputs Duration | 5 years 6 months |
Fair Value Unobservable Input Current Yield | 2.95% |

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