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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
ASSETS |  |
Cash equivalents | $ 47,897,000 | $ 13,000,000
Deposits with clearing organizations | 23,989,000 | 31,456,000
Securities owned: |  |
Securities owned | 1,028,496,000 | 735,393,000
Investments | 7,036,000 |
Loans held for sale |  | 60,234,000
Securities purchased under agreements to resell |  | 206,499,000
Derivative contracts: |  |
Derivative contracts | 1,827,000 | 15,609,000
Total | 1,102,398,000 | 1,062,348,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 295,507,000 | 126,493,000
Derivative contracts: |  |
Derivative contracts | 1,413,000 | 14,162,000
Total | 296,920,000 | 140,655,000
Future [Member] |  |
Derivative contracts: |  |
Derivative contracts | 209,000 | 249,000
Foreign Exchange Forward [Member] |  |
Derivative contracts: |  |
Derivative contracts | 1,000 | 2,000
To Be Announced Security [Member] |  |
Derivative contracts: |  |
Derivative contracts | 869,000 | 6,448,000
Derivative contracts: |  |
Derivative contracts | 927,000 | 11,619,000
Interest Rate Lock Commitments [Member] |  |
Derivative contracts: |  |
Derivative contracts | 53,000 | 9,161,000
Derivative contracts: |  |
Derivative contracts |  | 923,000
Auction Rate Securities Purchase Commitment [Member] |  |
Derivative contracts: |  |
Derivative contracts | 905,000 |
Derivative contracts: |  |
Derivative contracts | 276,000 | 1,369,000
Investments [Member] |  |
Securities owned: |  |
Investments | 189,000 | 157,000
Equity Securities [Member] |  |
Securities owned: |  |
Securities owned | 37,057,000 | 34,475,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 53,262,000 | 41,378,000
Money Markets [Member] |  |
Securities owned: |  |
Securities owned | 1,142,000 | 35,000
Auction Rate Securities [Member] |  |
Securities owned: |  |
Securities owned | 90,009,000 | 86,802,000
U.S. Treasury Securities [Member] |  |
Securities owned: |  |
Securities owned | 673,925,000 | 436,533,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 220,346,000 | 75,653,000
US Government Agencies Debt Securities [Member] |  |
Securities owned: |  |
Securities owned | 46,933,000 | 71,416,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 33,000 | 15,000
Sovereign Obligations [Member] |  |
Securities owned: |  |
Securities owned | 3,351,000 | 1,665,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 2,658,000 | 1,817,000
Corporate Debt and Other Obligations [Member] |  |
Securities owned: |  |
Securities owned | 32,262,000 | 16,138,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 8,708,000 | 1,652,000
Mortgage and Other Asset-Backed Securities [Member] |  |
Securities owned: |  |
Securities owned | 4,551,000 | 3,504,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 46,000 | 27,000
Municipal Bonds [Member] |  |
Securities owned: |  |
Securities owned | 85,892,000 | 30,132,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 0 | 0
Convertible Bonds [Member] |  |
Securities owned: |  |
Securities owned | 53,374,000 | 54,693,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 10,454,000 | 5,951,000
Level 1 [Member] |  |
ASSETS |  |
Cash equivalents | 47,897,000 | 13,000,000
Deposits with clearing organizations | 23,989,000 | 31,456,000
Securities owned: |  |
Securities owned | 719,832,000 | 496,283,000
Derivative contracts: |  |
Total | 791,718,000 | 540,739,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 273,608,000 | 117,031,000
Derivative contracts: |  |
Derivative contracts | 210,000 | 251,000
Total | 273,818,000 | 117,282,000
Level 1 [Member] | Future [Member] |  |
Derivative contracts: |  |
Derivative contracts | 209,000 | 249,000
Level 1 [Member] | Foreign Exchange Forward [Member] |  |
Derivative contracts: |  |
Derivative contracts | 1,000 | 2,000
Level 1 [Member] | Equity Securities [Member] |  |
Securities owned: |  |
Securities owned | 37,057,000 | 34,475,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 53,262,000 | 41,378,000
Level 1 [Member] | Money Markets [Member] |  |
Securities owned: |  |
Securities owned | 1,142,000 | 35,000
Level 1 [Member] | U.S. Treasury Securities [Member] |  |
Securities owned: |  |
Securities owned | 673,925,000 | 436,533,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 220,346,000 | 75,653,000
Level 1 [Member] | US Government Agencies Debt Securities [Member] |  |
Securities owned: |  |
Securities owned | 7,708,000 | 25,240,000
Level 2 [Member] |  |
Securities owned: |  |
Securities owned | 218,630,000 | 152,227,000
Loans held for sale |  | 60,234,000
Securities purchased under agreements to resell |  | 206,499,000
Derivative contracts: |  |
Derivative contracts | 869,000 | 6,448,000
Total | 219,499,000 | 425,408,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 21,899,000 | 9,462,000
Derivative contracts: |  |
Derivative contracts | 927,000 | 11,619,000
Total | 22,826,000 | 21,081,000
Level 2 [Member] | To Be Announced Security [Member] |  |
Derivative contracts: |  |
Derivative contracts | 869,000 | 6,448,000
Derivative contracts: |  |
Derivative contracts | 927,000 | 11,619,000
Level 2 [Member] | US Government Agencies Debt Securities [Member] |  |
Securities owned: |  |
Securities owned | 39,225,000 | 46,176,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 33,000 | 15,000
Level 2 [Member] | Sovereign Obligations [Member] |  |
Securities owned: |  |
Securities owned | 3,351,000 | 1,665,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 2,658,000 | 1,817,000
Level 2 [Member] | Corporate Debt and Other Obligations [Member] |  |
Securities owned: |  |
Securities owned | 32,262,000 | 16,138,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 8,708,000 | 1,652,000
Level 2 [Member] | Mortgage and Other Asset-Backed Securities [Member] |  |
Securities owned: |  |
Securities owned | 4,551,000 | 3,504,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 46,000 | 27,000
Level 2 [Member] | Municipal Bonds [Member] |  |
Securities owned: |  |
Securities owned | 85,867,000 | 30,051,000
Level 2 [Member] | Convertible Bonds [Member] |  |
Securities owned: |  |
Securities owned | 53,374,000 | 54,693,000
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 10,454,000 | 5,951,000
Level 3 [Member] |  |
Securities owned: |  |
Securities owned | 90,034,000 | 86,883,000
Derivative contracts: |  |
Derivative contracts | 958,000 | 9,161,000
Total | 91,181,000 | 96,201,000
Derivative contracts: |  |
Derivative contracts | 276,000 | 2,292,000
Total | 276,000 | 2,292,000
Level 3 [Member] | Interest Rate Lock Commitments [Member] |  |
Derivative contracts: |  |
Derivative contracts | 53,000 | 9,161,000
Derivative contracts: |  |
Derivative contracts |  | 923,000
Level 3 [Member] | Auction Rate Securities Purchase Commitment [Member] |  |
Derivative contracts: |  |
Derivative contracts | 905,000 |
Level 3 [Member] | Investments [Member] |  |
Securities owned: |  |
Investments | 189,000 | 157,000
Level 3 [Member] | Auction Rate Securities [Member] |  |
Securities owned: |  |
Securities owned | 90,009,000 | 86,802,000
Level 3 [Member] | Auction Rate Securities Purchase Commitment [Member] |  |
Derivative contracts: |  |
Derivative contracts | 276,000 | 1,369,000
Level 3 [Member] | Municipal Bonds [Member] |  |
Securities owned: |  |
Securities owned | 25,000 | 81,000
OMHHF |  |
Derivative contracts: |  |
Securities owned | $ 563,000 | $ 562,000

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