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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
ASSETS |  |
Cash equivalents | $ 75,462,000 | $ 16,242,000
Deposits with clearing organizations | 27,386,000 | 26,437,000
Securities owned: |  |
Securities owned | 986,992,000 | 710,668,000
Investments | 7,441,000 |
Securities purchased under agreements to resell | 3,617,000 | 24,006,000
Derivative contracts: |  |
Derivative contracts |  | 1,663,000
Total | 1,096,526,000 | 779,174,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold but not yet purchased, at fair value | 234,778,000 | 85,050,000
Derivative contracts: |  |
Derivative contracts | 4,130,000 | 2,024,000
Total | 238,908,000 | 87,074,000
Future [Member] |  |
Derivative contracts: |  |
Derivative contracts | 853,000 | 166,000
Foreign Exchange Forward [Member] |  |
Derivative contracts: |  |
Derivative contracts | 8,000 | 1,000
To Be Announced Security [Member] |  |
Derivative contracts: |  |
Derivative contracts | 2,901,000 | 814,000
Derivative contracts: |  |
Derivative contracts | 3,015,000 | 1,212,000
ARS Purchase Commitments [Member] |  |
Derivative contracts: |  |
Derivative contracts |  | 849,000
Auction Rate Securities Purchase Commitment [Member] |  |
Derivative contracts: |  |
Derivative contracts | 254,000 | 645,000
Investments [Member] |  |
Securities owned: |  |
Investments | 168,000 | 158,000
Equity Securities [Member] |  |
Securities owned: |  |
Securities owned | 35,473,000 | 31,174,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold but not yet purchased, at fair value | 37,346,000 | 41,689,000
Money Markets [Member] |  |
Securities owned: |  |
Securities owned | 578,000 | 189,000
Auction Rate Securities [Member] |  |
Securities owned: |  |
Securities owned | 107,170,000 | 84,926,000
U.S. Treasury Securities [Member] |  |
Securities owned: |  |
Securities owned | 583,656,000 | 418,888,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold but not yet purchased, at fair value | 142,877,000 | 28,662,000
US Government Agencies Debt Securities [Member] |  |
Securities owned: |  |
Securities owned | 13,911,000 | 38,269,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold but not yet purchased, at fair value | 6,000 | 12,000
Sovereign Obligations [Member] |  |
Securities owned: |  |
Securities owned | 20,561,000 | 1,894,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold but not yet purchased, at fair value | 16,653,000 |
Corporate Debt and Other Obligations [Member] |  |
Securities owned: |  |
Securities owned | 34,051,000 | 17,074,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold but not yet purchased, at fair value | 19,306,000 | 2,536,000
Mortgage and Other Asset-Backed Securities [Member] |  |
Securities owned: |  |
Securities owned | 4,562,000 | 5,024,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold but not yet purchased, at fair value | 2,134,000 | 31,000
Municipal Notes [Member] |  |
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold but not yet purchased, at fair value |  | 516,000
Municipal Bonds [Member] |  |
Securities owned: |  |
Securities owned | 141,996,000 | 56,750,000
Convertible Bonds [Member] |  |
Securities owned: |  |
Securities owned | 45,034,000 | 56,480,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold but not yet purchased, at fair value | 16,456,000 | 11,604,000
Level 1 [Member] |  |
ASSETS |  |
Cash equivalents | 75,462,000 | 16,242,000
Deposits with clearing organizations | 27,386,000 | 26,437,000
Securities owned: |  |
Securities owned | 621,449,000 | 456,129,000
Derivative contracts: |  |
Total | 724,297,000 | 498,808,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold but not yet purchased, at fair value | 180,223,000 | 70,351,000
Derivative contracts: |  |
Derivative contracts | 861,000 | 167,000
Total | 181,084,000 | 70,518,000
Level 1 [Member] | Future [Member] |  |
Derivative contracts: |  |
Derivative contracts | 853,000 | 166,000
Level 1 [Member] | Foreign Exchange Forward [Member] |  |
Derivative contracts: |  |
Derivative contracts | 8,000 | 1,000
Level 1 [Member] | Equity Securities [Member] |  |
Securities owned: |  |
Securities owned | 35,473,000 | 31,174,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold but not yet purchased, at fair value | 37,346,000 | 41,689,000
Level 1 [Member] | Money Markets [Member] |  |
Securities owned: |  |
Securities owned | 578,000 | 189,000
Level 1 [Member] | U.S. Treasury Securities [Member] |  |
Securities owned: |  |
Securities owned | 583,656,000 | 418,888,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold but not yet purchased, at fair value | 142,877,000 | 28,662,000
Level 1 [Member] | US Government Agencies Debt Securities [Member] |  |
Securities owned: |  |
Securities owned | 1,742,000 | 5,878,000
Level 2 [Member] |  |
Securities owned: |  |
Securities owned | 258,337,000 | 169,569,000
Securities purchased under agreements to resell | 3,617,000 | 24,006,000
Derivative contracts: |  |
Derivative contracts |  | 814,000
Total | 264,855,000 | 194,389,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold but not yet purchased, at fair value | 54,555,000 | 14,699,000
Derivative contracts: |  |
Derivative contracts | 3,015,000 | 1,212,000
Total | 57,570,000 | 15,911,000
Level 2 [Member] | To Be Announced Security [Member] |  |
Derivative contracts: |  |
Derivative contracts | 2,901,000 | 814,000
Derivative contracts: |  |
Derivative contracts | 3,015,000 | 1,212,000
Level 2 [Member] | US Government Agencies Debt Securities [Member] |  |
Securities owned: |  |
Securities owned | 12,169,000 | 32,391,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold but not yet purchased, at fair value | 6,000 | 12,000
Level 2 [Member] | Sovereign Obligations [Member] |  |
Securities owned: |  |
Securities owned | 20,561,000 | 1,894,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold but not yet purchased, at fair value | 16,653,000 |
Level 2 [Member] | Corporate Debt and Other Obligations [Member] |  |
Securities owned: |  |
Securities owned | 34,051,000 | 17,074,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold but not yet purchased, at fair value | 19,306,000 | 2,536,000
Level 2 [Member] | Mortgage and Other Asset-Backed Securities [Member] |  |
Securities owned: |  |
Securities owned | 4,562,000 | 5,024,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold but not yet purchased, at fair value | 2,134,000 | 31,000
Level 2 [Member] | Municipal Notes [Member] |  |
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold but not yet purchased, at fair value |  | 516,000
Level 2 [Member] | Municipal Bonds [Member] |  |
Securities owned: |  |
Securities owned | 141,960,000 | 56,706,000
Level 2 [Member] | Convertible Bonds [Member] |  |
Securities owned: |  |
Securities owned | 45,034,000 | 56,480,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold but not yet purchased, at fair value | 16,456,000 | 11,604,000
Level 3 [Member] |  |
Securities owned: |  |
Securities owned | 107,206,000 | 84,970,000
Derivative contracts: |  |
Derivative contracts |  | 849,000
Total | 107,374,000 | 85,977,000
Derivative contracts: |  |
Derivative contracts | 254,000 | 645,000
Total | 254,000 | 645,000
Level 3 [Member] | ARS Purchase Commitments [Member] |  |
Derivative contracts: |  |
Derivative contracts |  | 849,000
Level 3 [Member] | Investments [Member] |  |
Securities owned: |  |
Investments | 168,000 | 158,000
Level 3 [Member] | Auction Rate Securities [Member] |  |
Securities owned: |  |
Securities owned | 107,170,000 | 84,926,000
Level 3 [Member] | Auction Rate Securities Purchase Commitment [Member] |  |
Derivative contracts: |  |
Derivative contracts | 254,000 | 645,000
Level 3 [Member] | Municipal Bonds [Member] |  |
Securities owned: |  |
Securities owned | 36,000 | 44,000
OMHHF |  |
Derivative contracts: |  |
Securities owned | $ 560,000 | $ 3,600,000

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