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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