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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
ASSETS |  |
Cash equivalents | $ 13,449 | $ 13,000
Deposits with clearing organizations | 29,981 | 31,456
Securities owned: |  |
Securities owned | 1,036,782 | 735,393
Investments | 7,262 |
Loans held for sale | 13,532 | 60,234
Securities purchased under agreements to resell |  | 206,499
Derivative contracts: |  |
Derivative contracts | 16,375 | 15,609
Total | 1,110,280 | 1,062,348
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 270,952 | 126,493
Derivative contracts: |  |
Derivative contracts | 13,101 | 14,162
Total | 284,053 | 140,655
Future [Member] |  |
Derivative contracts: |  |
Derivative contracts | 709 | 249
Foreign Exchange Forward [Member] |  |
Derivative contracts: |  |
Derivative contracts | 17 | 2
To Be Announced Security [Member] |  |
Derivative contracts: |  |
Derivative contracts | 811 | 6,448
Derivative contracts: |  |
Derivative contracts | 11,816 | 11,619
Interest Rate Lock Commitments [Member] |  |
Derivative contracts: |  |
Derivative contracts | 14,024 | 9,161
Derivative contracts: |  |
Derivative contracts |  | 923
Auction Rate Securities Purchase Commitment [Member] |  |
Derivative contracts: |  |
Derivative contracts | 1,540 |
Derivative contracts: |  |
Derivative contracts | 559 | 1,369
Investments [Member] |  |
Securities owned: |  |
Investments | 161 | 157
Equity Securities [Member] |  |
Securities owned: |  |
Securities owned | 44,964 | 34,475
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 39,768 | 41,378
Money Markets [Member] |  |
Securities owned: |  |
Securities owned | 132 | 35
Auction Rate Securities [Member] |  |
Securities owned: |  |
Securities owned | 84,185 | 86,802
U.S. Treasury Securities [Member] |  |
Securities owned: |  |
Securities owned | 715,404 | 436,533
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 202,838 | 75,653
US Government Agencies Debt Securities [Member] |  |
Securities owned: |  |
Securities owned | 30,545 | 71,416
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 13 | 15
Sovereign Obligations [Member] |  |
Securities owned: |  |
Securities owned | 3,374 | 1,665
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 1,152 | 1,817
Corporate Debt and Other Obligations [Member] |  |
Securities owned: |  |
Securities owned | 22,823 | 16,138
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 11,166 | 1,652
Mortgage and Other Asset-Backed Securities [Member] |  |
Securities owned: |  |
Securities owned | 4,151 | 3,504
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 27 | 27
Municipal Bonds [Member] |  |
Securities owned: |  |
Securities owned | 80,220 | 30,132
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 | 50,984 | 54,693
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 15,988 | 5,951
Level 1 [Member] |  |
ASSETS |  |
Cash equivalents | 13,449 | 13,000
Deposits with clearing organizations | 29,981 | 31,456
Securities owned: |  |
Securities owned | 761,500 | 496,283
Derivative contracts: |  |
Total | 804,930 | 540,739
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 242,606 | 117,031
Derivative contracts: |  |
Derivative contracts | 726 | 251
Total | 243,332 | 117,282
Level 1 [Member] | Future [Member] |  |
Derivative contracts: |  |
Derivative contracts | 709 | 249
Level 1 [Member] | Foreign Exchange Forward [Member] |  |
Derivative contracts: |  |
Derivative contracts | 17 | 2
Level 1 [Member] | Equity Securities [Member] |  |
Securities owned: |  |
Securities owned | 44,964 | 34,475
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 39,768 | 41,378
Level 1 [Member] | Money Markets [Member] |  |
Securities owned: |  |
Securities owned | 132 | 35
Level 1 [Member] | U.S. Treasury Securities [Member] |  |
Securities owned: |  |
Securities owned | 715,404 | 436,533
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 202,838 | 75,653
Level 1 [Member] | US Government Agencies Debt Securities [Member] |  |
Securities owned: |  |
Securities owned | 1,000 | 25,240
Level 2 [Member] |  |
Securities owned: |  |
Securities owned | 191,012 | 152,227
Loans held for sale | 13,532 | 60,234
Securities purchased under agreements to resell |  | 206,499
Derivative contracts: |  |
Derivative contracts | 811 | 6,448
Total | 205,355 | 425,408
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 28,346 | 9,462
Derivative contracts: |  |
Derivative contracts | 11,816 | 11,619
Total | 40,162 | 21,081
Level 2 [Member] | To Be Announced Security [Member] |  |
Derivative contracts: |  |
Derivative contracts | 811 | 6,448
Derivative contracts: |  |
Derivative contracts | 11,816 | 11,619
Level 2 [Member] | US Government Agencies Debt Securities [Member] |  |
Securities owned: |  |
Securities owned | 29,545 | 46,176
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 13 | 15
Level 2 [Member] | Sovereign Obligations [Member] |  |
Securities owned: |  |
Securities owned | 3,374 | 1,665
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 1,152 | 1,817
Level 2 [Member] | Corporate Debt and Other Obligations [Member] |  |
Securities owned: |  |
Securities owned | 22,823 | 16,138
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 11,166 | 1,652
Level 2 [Member] | Mortgage and Other Asset-Backed Securities [Member] |  |
Securities owned: |  |
Securities owned | 4,151 | 3,504
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 27 | 27
Level 2 [Member] | Municipal Bonds [Member] |  |
Securities owned: |  |
Securities owned | 80,135 | 30,051
Level 2 [Member] | Convertible Bonds [Member] |  |
Securities owned: |  |
Securities owned | 50,984 | 54,693
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 15,988 | 5,951
Level 3 [Member] |  |
Securities owned: |  |
Securities owned | 84,270 | 86,883
Derivative contracts: |  |
Derivative contracts | 15,564 | 9,161
Total | 99,995 | 96,201
Derivative contracts: |  |
Derivative contracts | 559 | 2,292
Total | 559 | 2,292
Level 3 [Member] | Interest Rate Lock Commitments [Member] |  |
Derivative contracts: |  |
Derivative contracts | 14,024 | 9,161
Derivative contracts: |  |
Derivative contracts |  | 923
Level 3 [Member] | Auction Rate Securities Purchase Commitment [Member] |  |
Derivative contracts: |  |
Derivative contracts | 1,540 |
Level 3 [Member] | Investments [Member] |  |
Securities owned: |  |
Investments | 161 | 157
Level 3 [Member] | Auction Rate Securities [Member] |  |
Securities owned: |  |
Securities owned | 84,185 | 86,802
Level 3 [Member] | Auction Rate Securities Purchase Commitment [Member] |  |
Derivative contracts: |  |
Derivative contracts | 559 | 1,369
Level 3 [Member] | Municipal Bonds [Member] |  |
Securities owned: |  |
Securities owned | $ 85 | $ 81

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