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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2017
ASSETS |  |  |  |
Cash equivalents | $ 10,500,000 |  |  | $ 10,490,000
Deposits with clearing organizations | 31,135,000 |  |  | 34,293,000
Securities owned |  |  |  |
Securities owned, at fair value | 1,020,404,000 |  |  | 926,597,000
Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned | 1,020,404,000 |  |  | 926,597,000
Investments | 7,632,000 |  |  |
Derivative contracts |  |  |  |
Total | 1,065,018,000 |  |  | 972,265,000
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 162,042,000 |  |  | 94,486,000
Derivative contracts: |  |  |  |
Derivative contracts | 3,884,000 |  |  | 1,388,000
Total | 165,926,000 |  |  | 95,874,000
Future [Member] |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 942,000 |  |  | 766,000
Foreign exchange forward contracts |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 5,000 |  |  |
TBAs |  |  |  |
Derivative contracts |  |  |  |
Derivative contracts, total | 2,815,000 |  |  | 716,000
Derivative contracts: |  |  |  |
Derivative contracts | 2,715,000 |  |  | 614,000
Investments |  |  |  |
Securities owned |  |  |  |
Investments | 164,000 |  |  | 169,000
Equity Securities [Member] |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 33,112,000 |  |  | 34,067,000
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 26,978,000 |  |  | 25,393,000
Money Market Funds [Member] |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value |  |  |  | 383,000
Auction rate securities |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 90,223,000 |  |  | 111,853,000
U.S. Treasury securities |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 690,988,000 |  |  | 640,337,000
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 115,465,000 |  |  | 53,425,000
US Government Agencies Debt Securities [Member] |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 16,447,000 |  |  | 9,905,000
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 6,000 |  |  | 13,000
Sovereign obligations |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 204,000 |  |  | 608,000
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value |  |  |  | 1,179,000
Corporate debt and other obligations |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 24,813,000 |  |  | 12,538,000
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 5,289,000 |  |  | 4,357,000
Mortgage and other asset-backed securities |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 6,870,000 |  |  | 4,037,000
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 6,808,000 |  |  | 10,000
Municipal obligations |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 116,612,000 |  |  | 89,653,000
Convertible bonds |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 41,135,000 |  |  | 23,216,000
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 7,496,000 |  |  | 10,109,000
Level 1 |  |  |  |
ASSETS |  |  |  |
Cash equivalents | 10,500,000 |  |  | 10,490,000
Deposits with clearing organizations | 31,135,000 |  |  | 34,293,000
Securities owned |  |  |  |
Securities owned, at fair value | 732,641,000 |  |  | 677,798,000
Derivative contracts |  |  |  |
Total | 774,276,000 |  |  | 722,581,000
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 142,443,000 |  |  | 78,818,000
Derivative contracts: |  |  |  |
Derivative contracts | 947,000 |  |  | 766,000
Total | 143,390,000 |  |  | 79,584,000
Level 1 | Future [Member] |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 942,000 |  |  | 766,000
Level 1 | Foreign exchange forward contracts |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 5,000 |  |  |
Level 1 | Corporate equities |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 33,112,000 |  |  | 34,067,000
Level 1 | Equity Securities [Member] |  |  |  |
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 26,978,000 |  |  | 25,393,000
Level 1 | Money markets |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value |  |  |  | 383,000
Level 1 | Auction rate securities |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 0 |  |  |
Level 1 | U.S. Treasury securities |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 690,988,000 |  |  | 640,337,000
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 115,465,000 |  |  | 53,425,000
Level 1 | US Government Agencies Debt Securities [Member] |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 8,541,000 |  |  | 3,011,000
Level 2 |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 215,142,000 |  |  | 161,366,000
Derivative contracts |  |  |  |
Total | 217,957,000 |  |  | 162,082,000
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 19,599,000 |  |  | 15,668,000
Derivative contracts: |  |  |  |
Derivative contracts | 2,806,000 |  |  | 614,000
Total | 22,405,000 |  |  | 16,282,000
Level 2 | TBAs |  |  |  |
Derivative contracts |  |  |  |
Derivative contracts, total | 2,815,000 |  |  | 716,000
Derivative contracts: |  |  |  |
Derivative contracts | 2,715,000 |  |  | 614,000
Level 2 | Equity Securities [Member] |  |  |  |
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 0 |  |  |
Level 2 | Auction rate securities |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 17,602,000 |  |  | 24,455,000
Level 2 | US Government Agencies Debt Securities [Member] |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 7,906,000 |  |  | 6,894,000
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 6,000 |  |  | 13,000
Level 2 | Sovereign obligations |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 204,000 |  |  | 608,000
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value |  |  |  | 1,179,000
Level 2 | Corporate debt and other obligations |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 24,813,000 |  |  | 12,538,000
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 5,289,000 |  |  | 4,357,000
Level 2 | Mortgage and other asset-backed securities |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 6,870,000 |  |  | 4,037,000
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 6,808,000 |  |  | 10,000
Level 2 | Municipal obligations |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 116,612,000 |  |  | 89,618,000
Level 2 | Convertible bonds |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 41,135,000 |  |  | 23,216,000
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 7,496,000 |  |  | 10,109,000
Level 3 |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 72,621,000 |  |  | 87,433,000
Derivative contracts |  |  |  |
Total | 72,785,000 |  |  | 87,602,000
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 0 |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 131,000 |  |  | 8,000
Total | 131,000 |  |  | 8,000
Level 3 | Investments |  |  |  |
Securities owned |  |  |  |
Investments | 164,000 |  |  | 169,000
Level 3 | Auction rate securities |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 72,621,000 |  |  | 87,398,000
Level 3 | Municipal obligations |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value |  |  |  | 35,000
Auction rate securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers, Net | 17,600,000 | $ 0 | $ 0 |
ARS purchase commitments |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 222,000 |  |  | 8,000
ARS purchase commitments | Level 2 |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 91,000 |  |  |
ARS purchase commitments | Level 3 |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | $ 131,000 |  |  | $ 8,000

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