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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
ASSETS |  |
Cash equivalents | $ 60,268 | $ 58,945
Securities segregated for regulatory and other purposes | 11,495 | 11,499
Deposits with clearing organizations | 10,492 | 9,095
Securities owned |  |
Securities owned, at fair value | 856,088 | 759,742
Investments | 5,247 |
Loans held for sale | 75,989 |
Securities purchased under agreements to resell | 184,000 |
Derivative contracts, total | 4,530 | 3,188
Total | 1,267,309 | 902,988
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 76,314 | 173,450
Investments | 648 | 258
Derivative contracts: |  |
Derivative contracts, total |  | 3,232
Derivative contracts | 6,574 |
TBAs | 73 | 175
Total | 83,536 | 176,940
Euro Dollars Futures [Member] |  |
Derivative contracts: |  |
Derivative contracts | 44 |
Derivative contracts |  | 4
Interest Rate Lock Commitments [Member] |  |
Securities owned |  |
Derivative contracts, total | 2,375 |
Derivative contracts: |  |
Derivative contracts | 3,653 |
TBAs [Member] |  |
Securities owned |  |
Derivative contracts, total | 2,155 |
U.S. Treasury Futures [Member] |  |
Derivative contracts: |  |
Derivative contracts | 186 |
Derivative contracts |  | 286
Federal Funds Futures [Member] |  |
Derivative contracts: |  |
Derivative contracts | 18 |
Derivative contracts |  | 120
Corporate Equities [Member] |  |
Securities owned |  |
Securities owned, at fair value | 61,634 | 43,708
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 45,336 | 29,884
Money Markets [Member] |  |
Securities owned |  |
Securities owned, at fair value | 1,263 | 2,328
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 241 | 325
Auction Rate Securities [Member] |  |
Securities owned |  |
Securities owned, at fair value | 85,124 | 72,118
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value |  | 100
ARS Purchase Commitments [Member] |  |
Derivative contracts: |  |
Derivative contracts | 2,600 |
Derivative contracts |  | 2,647
Investments Included in Other Assets [Member] |  |
Securities owned |  |
Investments | 64,447 | 60,519
U.S. Treasury Securities [Member] |  |
Securities owned |  |
Securities owned, at fair value | 566,346 | 497,546
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 11,837 | 131,899
U.S. Agency Securities [Member] |  |
Securities owned |  |
Securities owned, at fair value | 29,448 | 27,690
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 52 | 31
Sovereign Obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value | 320 | 19
Corporate Debt and Other Obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value | 14,673 | 14,428
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 4,847 | 1,858
Mortgage and Other Asset-Backed Securities [Member] |  |
Securities owned |  |
Securities owned, at fair value | 3,395 | 2,920
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 7 | 18
Municipal Obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value | 40,166 | 49,855
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 72 | 467
Convertible Bonds [Member] |  |
Securities owned |  |
Securities owned, at fair value | 53,719 | 49,130
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 13,922 | 8,868
Level 1 [Member] |  |
ASSETS |  |
Cash equivalents | 60,268 | 58,945
Securities segregated for regulatory and other purposes | 11,495 | 11,499
Deposits with clearing organizations | 10,492 | 9,095
Securities owned |  |
Securities owned, at fair value | 629,243 | 534,291
Total | 722,273 | 624,307
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 57,414 | 153,170
Investments | 648 | 258
Derivative contracts: |  |
Derivative contracts, total |  | 286
Derivative contracts | 186 |
Total | 58,248 | 153,714
Level 1 [Member] | U.S. Treasury Futures [Member] |  |
Derivative contracts: |  |
Derivative contracts | 186 |
Derivative contracts |  | 286
Level 1 [Member] | Corporate Equities [Member] |  |
Securities owned |  |
Securities owned, at fair value | 61,634 | 31,958
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 45,336 | 20,946
Level 1 [Member] | Money Markets [Member] |  |
Securities owned |  |
Securities owned, at fair value | 1,263 | 2,328
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 241 | 325
Level 1 [Member] | Investments Included in Other Assets [Member] |  |
Securities owned |  |
Investments | 10,775 | 10,477
Level 1 [Member] | U.S. Treasury Securities [Member] |  |
Securities owned |  |
Securities owned, at fair value | 566,346 | 497,546
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 11,837 | 131,899
Level 1 [Member] | Corporate Debt and Other Obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value |  | 2,459
Level 2 [Member] |  |
Securities owned |  |
Securities owned, at fair value | 141,485 | 153,054
Loans held for sale | 75,989 |
Securities purchased under agreements to resell | 184,000 |
Derivative contracts, total | 2,155 | 3,188
Total | 451,355 | 193,330
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 18,900 | 20,180
Derivative contracts: |  |
Derivative contracts, total |  | 299
Derivative contracts | 135 |
TBAs | 73 | 175
Total | 19,035 | 20,479
Level 2 [Member] | Euro Dollars Futures [Member] |  |
Derivative contracts: |  |
Derivative contracts | 44 |
Derivative contracts |  | 4
Level 2 [Member] | TBAs [Member] |  |
Securities owned |  |
Derivative contracts, total | 2,155 |
Level 2 [Member] | Federal Funds Futures [Member] |  |
Derivative contracts: |  |
Derivative contracts | 18 |
Derivative contracts |  | 120
Level 2 [Member] | Corporate Equities [Member] |  |
Securities owned |  |
Securities owned, at fair value |  | 11,750
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value |  | 8,938
Level 2 [Member] | Investments Included in Other Assets [Member] |  |
Securities owned |  |
Investments | 47,726 | 37,088
Level 2 [Member] | U.S. Agency Securities [Member] |  |
Securities owned |  |
Securities owned, at fair value | 29,448 | 27,690
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 52 | 31
Level 2 [Member] | Sovereign Obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value | 320 | 19
Level 2 [Member] | Corporate Debt and Other Obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value | 14,673 | 11,969
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 4,847 | 1,858
Level 2 [Member] | Mortgage and Other Asset-Backed Securities [Member] |  |
Securities owned |  |
Securities owned, at fair value | 3,395 | 2,880
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 7 | 18
Level 2 [Member] | Municipal Obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value | 39,930 | 49,616
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 72 | 467
Level 2 [Member] | Convertible Bonds [Member] |  |
Securities owned |  |
Securities owned, at fair value | 53,719 | 49,130
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 13,922 | 8,868
Level 3 [Member] |  |
Securities owned |  |
Securities owned, at fair value | 85,360 | 72,397
Derivative contracts, total | 2,375 |
Total | 93,681 | 85,351
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value |  | 100
Derivative contracts: |  |
Derivative contracts, total |  | 2,647
Derivative contracts | 6,253 |
Total | 6,253 | 2,747
Level 3 [Member] | Interest Rate Lock Commitments [Member] |  |
Securities owned |  |
Derivative contracts, total | 2,375 |
Derivative contracts: |  |
Derivative contracts | 3,653 |
Level 3 [Member] | Auction Rate Securities [Member] |  |
Securities owned |  |
Securities owned, at fair value | 85,124 | 72,118
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value |  | 100
Level 3 [Member] | ARS Purchase Commitments [Member] |  |
Derivative contracts: |  |
Derivative contracts | 2,600 |
Derivative contracts |  | 2,647
Level 3 [Member] | Investments Included in Other Assets [Member] |  |
Securities owned |  |
Investments | 5,946 | 12,954
Level 3 [Member] | Mortgage and Other Asset-Backed Securities [Member] |  |
Securities owned |  |
Securities owned, at fair value |  | 40
Level 3 [Member] | Municipal Obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value | $ 236 | $ 239

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