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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
ASSETS |  |
Cash equivalents | $ 328 | $ 31,175
Deposits with clearing organizations | 43,497 | 24,188
Securities owned: |  |
Securities owned | 1,040,631 | 843,155
Investments | 7,966 |
Loans held for sale | 34,050 | 19,243
Securities purchased under agreements to resell |  | 250,000
Derivative contracts: |  |
Derivative contracts | 11,152 | 12,111
Total | 1,141,379 | 1,190,078
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 311,664 | 92,510
Derivative contracts: |  |
Derivative contracts | 8,700 | 3,505
Total | 320,364 | 96,015
Future [Member] |  |
Derivative contracts: |  |
Derivative contracts | 870 | 353
Foreign Exchange Forward [Member] |  |
Derivative contracts: |  |
Derivative contracts | 5 | 10
To Be Announced Security [Member] |  |
Derivative contracts: |  |
Derivative contracts | 344 | 4,535
Derivative contracts: |  |
TBAs | 7,161 | 1,018
Interest Rate Lock Commitments [Member] |  |
Derivative contracts: |  |
Derivative contracts | 10,808 | 7,576
Derivative contracts: |  |
Derivative contracts | 187 | 1,222
Auction Rate Securities Purchase Commitment [Member] |  |
Derivative contracts: |  |
Derivative contracts | 477 | 902
Corporate Equities [Member] |  |
Securities owned: |  |
Securities owned | 41,209 | 42,751
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 35,167 | 47,574
Money Markets [Member] |  |
Securities owned: |  |
Securities owned | 846 | 1,245
Auction Rate Securities [Member] |  |
Securities owned: |  |
Securities owned | 96,483 | 91,422
Investments Included in Other Assets [Member] |  |
Securities owned: |  |
Investments | 11,721 | 10,206
U.S. Treasury Securities [Member] |  |
Securities owned: |  |
Securities owned | 727,722 | 540,223
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 259,730 | 30,581
U.S. Agency Securities [Member] |  |
Securities owned: |  |
Securities owned | 18,684 | 26,261
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 20 | 34
Sovereign Obligations [Member] |  |
Securities owned: |  |
Securities owned | 3,625 | 4,123
Corporate Debt and Other Obligations [Member] |  |
Securities owned: |  |
Securities owned | 15,475 | 19,795
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 7,070 | 2,646
Mortgage and Other Asset-Backed Securities [Member] |  |
Securities owned: |  |
Securities owned | 7,276 | 6,689
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value |  | 255
Municipal Obligations [Member] |  |
Securities owned: |  |
Securities owned | 74,365 | 60,833
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 50 | 51
Convertible Bonds [Member] |  |
Securities owned: |  |
Securities owned | 54,946 | 49,813
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 9,539 | 11,369
Level 1 [Member] |  |
ASSETS |  |
Cash equivalents | 328 | 31,175
Deposits with clearing organizations | 43,497 | 24,188
Securities owned: |  |
Securities owned | 770,238 | 584,219
Derivative contracts: |  |
Total | 814,063 | 639,582
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 294,897 | 78,155
Derivative contracts: |  |
Derivative contracts | 875 | 363
Total | 295,772 | 78,518
Level 1 [Member] | Future [Member] |  |
Derivative contracts: |  |
Derivative contracts | 870 | 353
Level 1 [Member] | Foreign Exchange Forward [Member] |  |
Derivative contracts: |  |
Derivative contracts | 5 | 10
Level 1 [Member] | Corporate Equities [Member] |  |
Securities owned: |  |
Securities owned | 41,209 | 42,751
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 35,167 | 47,574
Level 1 [Member] | Money Markets [Member] |  |
Securities owned: |  |
Securities owned | 846 | 1,245
Level 1 [Member] | Investments Included in Other Assets [Member] |  |
Securities owned: |  |
Investments |  | 0
Level 1 [Member] | U.S. Treasury Securities [Member] |  |
Securities owned: |  |
Securities owned | 727,722 | 540,223
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 259,730 | 30,581
Level 1 [Member] | U.S. Agency Securities [Member] |  |
Securities owned: |  |
Securities owned | 461 |
Level 2 [Member] |  |
Securities owned: |  |
Securities owned | 173,845 | 167,350
Loans held for sale | 34,050 | 19,243
Securities purchased under agreements to resell |  | 250,000
Derivative contracts: |  |
Derivative contracts | 344 | 4,535
Total | 211,327 | 441,826
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 16,767 | 14,355
Derivative contracts: |  |
Derivative contracts | 7,161 | 1,018
Total | 23,928 | 15,373
Level 2 [Member] | To Be Announced Security [Member] |  |
Derivative contracts: |  |
Derivative contracts | 344 | 4,535
Derivative contracts: |  |
TBAs | 7,161 | 1,018
Level 2 [Member] | Investments Included in Other Assets [Member] |  |
Securities owned: |  |
Investments | 3,088 | 698
Level 2 [Member] | U.S. Agency Securities [Member] |  |
Securities owned: |  |
Securities owned | 18,223 | 26,261
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 20 | 34
Level 2 [Member] | Sovereign Obligations [Member] |  |
Securities owned: |  |
Securities owned | 3,625 | 4,123
Level 2 [Member] | Corporate Debt and Other Obligations [Member] |  |
Securities owned: |  |
Securities owned | 15,475 | 19,795
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 7,070 | 2,646
Level 2 [Member] | Mortgage and Other Asset-Backed Securities [Member] |  |
Securities owned: |  |
Securities owned | 7,276 | 6,689
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value |  | 255
Level 2 [Member] | Municipal Obligations [Member] |  |
Securities owned: |  |
Securities owned | 74,300 | 60,669
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 50 | 51
Level 2 [Member] | Convertible Bonds [Member] |  |
Securities owned: |  |
Securities owned | 54,946 | 49,813
Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] |  |
Securities sold, but not yet purchased, at fair value | 9,539 | 11,369
Level 3 [Member] |  |
Securities owned: |  |
Securities owned | 96,548 | 91,586
Derivative contracts: |  |
Derivative contracts | 10,808 | 7,576
Total | 115,989 | 108,670
Derivative contracts: |  |
Derivative contracts | 664 | 2,124
Total | 664 | 2,124
Level 3 [Member] | Interest Rate Lock Commitments [Member] |  |
Derivative contracts: |  |
Derivative contracts | 10,808 | 7,576
Derivative contracts: |  |
Derivative contracts | 187 | 1,222
Level 3 [Member] | Auction Rate Securities [Member] |  |
Securities owned: |  |
Securities owned | 96,483 | 91,422
Level 3 [Member] | Auction Rate Securities Purchase Commitment [Member] |  |
Derivative contracts: |  |
Derivative contracts | 477 | 902
Level 3 [Member] | Investments Included in Other Assets [Member] |  |
Securities owned: |  |
Investments | 8,633 | 9,508
Level 3 [Member] | Municipal Obligations [Member] |  |
Securities owned: |  |
Securities owned | $ 65 | $ 164

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