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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
ASSETS    
Cash equivalents $ 13,000 $ 31,175
Deposits With Clearing Organizations Fair Value 31,456 24,188
Securities owned:    
Securities owned 735,393 843,155
Investments 7,627  
Loans held for sale 60,234 19,243
Securities purchased under agreements to resell 206,499 [1] 250,000 [2]
Derivative contracts:    
Derivative contracts, total 15,609 12,111
Total 1,070,454 1,189,380
Liabilities    
Securities sold, but not yet purchased, at fair value 126,493 92,510
Derivative contracts:    
Derivative contracts 14,162 3,505
Total 140,655 96,015
Futures    
Derivative contracts:    
Derivative contracts 249 353
Foreign currency forward contracts    
Derivative contracts:    
Derivative contracts 2 10
TBAs    
Derivative contracts:    
Derivative contracts, total 6,448 4,535
Derivative contracts:    
Derivative contracts 11,619 1,018
Interest rate lock commitments    
Derivative contracts:    
Derivative contracts, total 9,161 7,576
Derivative contracts:    
Derivative contracts 923 1,222
ARS purchase commitments    
Derivative contracts:    
Derivative contracts 1,369 902
Investments    
Securities owned:    
Investments 8,263 [3] 9,508 [4]
Equity securities    
Securities owned:    
Securities owned 34,475 42,751
Liabilities    
Securities sold, but not yet purchased, at fair value 41,378 47,574
Money markets    
Securities owned:    
Securities owned 35 1,245
Auction rate securities    
Securities owned:    
Securities owned 86,802 91,422
U.S. Treasury securities    
Securities owned:    
Securities owned 436,533 540,223
Liabilities    
Securities sold, but not yet purchased, at fair value 75,653 30,581
Agency Securities [Member]    
Securities owned:    
Securities owned 71,416 26,261
Liabilities    
Securities sold, but not yet purchased, at fair value 15 34
Sovereign obligations    
Securities owned:    
Securities owned 1,665 4,123
Liabilities    
Securities sold, but not yet purchased, at fair value 1,817  
Corporate debt and other obligations    
Securities owned:    
Securities owned 16,138 19,795
Liabilities    
Securities sold, but not yet purchased, at fair value 1,652 2,646
Mortgage and other asset-backed securities    
Securities owned:    
Securities owned 3,504 6,689
Liabilities    
Securities sold, but not yet purchased, at fair value 27 255
Municipal obligations    
Securities owned:    
Securities owned 30,132 60,833
Liabilities    
Securities sold, but not yet purchased, at fair value 0 51
Convertible bonds    
Securities owned:    
Securities owned 54,693 49,813
Liabilities    
Securities sold, but not yet purchased, at fair value 5,951 11,369
Level 1    
ASSETS    
Cash equivalents 13,000 31,175
Deposits With Clearing Organizations Fair Value 31,456 24,188
Securities owned:    
Securities owned 496,283 584,219
Derivative contracts:    
Total 540,739 639,582
Liabilities    
Securities sold, but not yet purchased, at fair value 117,031 78,155
Derivative contracts:    
Derivative contracts 251 363
Total 117,282 78,518
Level 1 | Futures    
Derivative contracts:    
Derivative contracts 249 353
Level 1 | Foreign currency forward contracts    
Derivative contracts:    
Derivative contracts 2 10
Level 1 | Equity securities    
Securities owned:    
Securities owned 34,475 42,751
Liabilities    
Securities sold, but not yet purchased, at fair value 41,378 47,574
Level 1 | Money markets    
Securities owned:    
Securities owned 35 1,245
Level 1 | U.S. Treasury securities    
Securities owned:    
Securities owned 436,533 540,223
Liabilities    
Securities sold, but not yet purchased, at fair value 75,653 30,581
Level 1 | Agency Securities [Member]    
Securities owned:    
Securities owned 25,240  
Level 2    
Securities owned:    
Securities owned 152,227 167,350
Loans held for sale 60,234 19,243
Securities purchased under agreements to resell 206,499 [1] 250,000 [2]
Derivative contracts:    
Derivative contracts, total 6,448 4,535
Total 425,408 441,128
Liabilities    
Securities sold, but not yet purchased, at fair value 9,462 14,355
Derivative contracts:    
Derivative contracts 11,619 1,018
Total 21,081 15,373
Level 2 | TBAs    
Derivative contracts:    
Derivative contracts, total 6,448 4,535
Derivative contracts:    
Derivative contracts 11,619 1,018
Level 2 | Agency Securities [Member]    
Securities owned:    
Securities owned 46,176 26,261
Liabilities    
Securities sold, but not yet purchased, at fair value 15 34
Level 2 | Sovereign obligations    
Securities owned:    
Securities owned 1,665 4,123
Liabilities    
Securities sold, but not yet purchased, at fair value 1,817  
Level 2 | Corporate debt and other obligations    
Securities owned:    
Securities owned 16,138 19,795
Liabilities    
Securities sold, but not yet purchased, at fair value 1,652 2,646
Level 2 | Mortgage and other asset-backed securities    
Securities owned:    
Securities owned 3,504 6,689
Liabilities    
Securities sold, but not yet purchased, at fair value 27 255
Level 2 | Municipal obligations    
Securities owned:    
Securities owned 30,051 60,669
Liabilities    
Securities sold, but not yet purchased, at fair value   51
Level 2 | Convertible bonds    
Securities owned:    
Securities owned 54,693 49,813
Liabilities    
Securities sold, but not yet purchased, at fair value 5,951 11,369
Level 3    
Securities owned:    
Securities owned 86,883 91,586
Derivative contracts:    
Derivative contracts, total 9,161 7,576
Total 104,307 108,670
Derivative contracts:    
Derivative contracts 2,292 2,124
Total 2,292 2,124
Level 3 | Interest rate lock commitments    
Derivative contracts:    
Derivative contracts, total 9,161 7,576
Derivative contracts:    
Derivative contracts 923 1,222
Level 3 | ARS purchase commitments    
Derivative contracts:    
Derivative contracts 1,369 902
Level 3 | Investments    
Securities owned:    
Investments 8,263 [3] 9,508 [4]
Level 3 | Auction rate securities    
Securities owned:    
Securities owned 86,802 91,422
Level 3 | Municipal obligations    
Securities owned:    
Securities owned $ 81 $ 164
[1] Included in securities purchased under agreements to resell where the Company has elected fair value option treatment.
[2] Included in securities purchased under agreements to resell where the Company has elected fair value option treatment.
[3] Included in other assets on the consolidated balance sheet.
[4] Included in other assets on the consolidated balance sheet.