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Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
ASSETS |  |
Cash equivalents | $ 86,242 | $ 60,268
Securities segregated for regulatory and other purposes | 11,499 | 11,495
Deposits with clearing organizations | 15,094 | 10,492
Securities owned: |  |
Securities owned, at fair value | 936,016 | 856,088
Investments | 7,987 |
Loans held for sale | 9,438 | 75,989
Securities purchased under agreements to resell | 250,000 | 184,000
Derivative contracts: |  |
Derivative contracts, total | 9,825 | 4,530
Total | 1,376,214 | 1,267,309
Securities sold, but not yet purchased: |  |
Securities sold, but not yet purchased at fair value | 143,453 | 76,314
Investments | 101 | 648
Derivative contracts: |  |
Derivative contracts | 7,340 | 6,574
Total | 150,894 | 83,536
TBAs [Member] |  |
Derivative contracts: |  |
Derivative contracts, total | 6,787 | 2,155
Derivative contracts: |  |
TBAs | 344 | 73
Interest Rate Lock Commitments [Member] |  |
Derivative contracts: |  |
Derivative contracts, total | 3,038 | 2,375
Derivative contracts: |  |
Derivative contracts | 4,402 | 3,653
Euro Dollars Futures [Member] |  |
Derivative contracts: |  |
Derivative contracts | 105 | 44
U.S. Treasury Futures [Member] |  |
Derivative contracts: |  |
Derivative contracts | 179 | 186
Federal Funds Futures [Member] |  |
Derivative contracts: |  |
Derivative contracts | 105 | 18
Corporate Equities [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 40,443 | 61,634
Securities sold, but not yet purchased: |  |
Securities sold, but not yet purchased at fair value | 47,249 | 45,336
Money Markets [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 1,109 | 1,263
Securities sold, but not yet purchased: |  |
Securities sold, but not yet purchased at fair value | 208 | 241
Auction Rate Securities [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 85,025 | 85,124
Auction Rate Securities Commitments to Purchase [Member] |  |
Derivative contracts: |  |
Derivative contracts | 2,205 | 2,600
Investments Included in Other Assets [Member] |  |
Securities owned: |  |
Investments | 58,100 | 64,447
U.S. Treasury Securities [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 638,664 | 566,346
Securities sold, but not yet purchased: |  |
Securities sold, but not yet purchased at fair value | 85,043 | 11,837
U.S. Agency Securities [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 50,205 | 29,448
Securities sold, but not yet purchased: |  |
Securities sold, but not yet purchased at fair value | 17 | 52
Sovereign Obligations [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 715 | 320
Securities sold, but not yet purchased: |  |
Securities sold, but not yet purchased at fair value | 442 |
Corporate Debt and Other Obligations [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 15,151 | 14,673
Securities sold, but not yet purchased: |  |
Securities sold, but not yet purchased at fair value | 2,325 | 4,847
Mortgage and Other Asset-Backed Securities [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 5,245 | 3,395
Securities sold, but not yet purchased: |  |
Securities sold, but not yet purchased at fair value | 4 | 7
Municipal Obligations [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 43,494 | 40,166
Securities sold, but not yet purchased: |  |
Securities sold, but not yet purchased at fair value | 113 | 72
Convertible Bonds [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 55,965 | 53,719
Securities sold, but not yet purchased: |  |
Securities sold, but not yet purchased at fair value | 8,052 | 13,922
Level 1 [Member] |  |
ASSETS |  |
Cash equivalents | 86,242 | 60,268
Securities segregated for regulatory and other purposes | 11,499 | 11,495
Deposits with clearing organizations | 15,094 | 10,492
Securities owned: |  |
Securities owned, at fair value | 680,216 | 629,243
Derivative contracts: |  |
Total | 794,117 | 722,273
Securities sold, but not yet purchased: |  |
Securities sold, but not yet purchased at fair value | 132,500 | 57,414
Investments | 101 | 648
Derivative contracts: |  |
Derivative contracts | 179 | 186
Total | 132,780 | 58,248
Level 1 [Member] | U.S. Treasury Futures [Member] |  |
Derivative contracts: |  |
Derivative contracts | 179 | 186
Level 1 [Member] | Corporate Equities [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 40,443 | 61,634
Securities sold, but not yet purchased: |  |
Securities sold, but not yet purchased at fair value | 47,249 | 45,336
Level 1 [Member] | Money Markets [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 1,109 | 1,263
Securities sold, but not yet purchased: |  |
Securities sold, but not yet purchased at fair value | 208 | 241
Level 1 [Member] | Investments Included in Other Assets [Member] |  |
Securities owned: |  |
Investments | 1,066 | 10,775
Level 1 [Member] | U.S. Treasury Securities [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 638,664 | 566,346
Securities sold, but not yet purchased: |  |
Securities sold, but not yet purchased at fair value | 85,043 | 11,837
Level 2 [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 170,705 | 141,485
Loans held for sale | 9,438 | 75,989
Securities purchased under agreements to resell | 250,000 | 184,000
Derivative contracts: |  |
Derivative contracts, total | 6,787 | 2,155
Total | 485,258 | 451,355
Securities sold, but not yet purchased: |  |
Securities sold, but not yet purchased at fair value | 10,953 | 18,900
Derivative contracts: |  |
Derivative contracts | 554 | 135
Total | 11,507 | 19,035
Level 2 [Member] | TBAs [Member] |  |
Derivative contracts: |  |
Derivative contracts, total | 6,787 | 2,155
Derivative contracts: |  |
TBAs | 344 | 73
Level 2 [Member] | Euro Dollars Futures [Member] |  |
Derivative contracts: |  |
Derivative contracts | 105 | 44
Level 2 [Member] | Federal Funds Futures [Member] |  |
Derivative contracts: |  |
Derivative contracts | 105 | 18
Level 2 [Member] | Investments Included in Other Assets [Member] |  |
Securities owned: |  |
Investments | 48,328 | 47,726
Level 2 [Member] | U.S. Agency Securities [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 50,205 | 29,448
Securities sold, but not yet purchased: |  |
Securities sold, but not yet purchased at fair value | 17 | 52
Level 2 [Member] | Sovereign Obligations [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 715 | 320
Securities sold, but not yet purchased: |  |
Securities sold, but not yet purchased at fair value | 442 |
Level 2 [Member] | Corporate Debt and Other Obligations [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 15,151 | 14,673
Securities sold, but not yet purchased: |  |
Securities sold, but not yet purchased at fair value | 2,325 | 4,847
Level 2 [Member] | Mortgage and Other Asset-Backed Securities [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 5,245 | 3,395
Securities sold, but not yet purchased: |  |
Securities sold, but not yet purchased at fair value | 4 | 7
Level 2 [Member] | Municipal Obligations [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 43,424 | 39,930
Securities sold, but not yet purchased: |  |
Securities sold, but not yet purchased at fair value | 113 | 72
Level 2 [Member] | Convertible Bonds [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 55,965 | 53,719
Securities sold, but not yet purchased: |  |
Securities sold, but not yet purchased at fair value | 8,052 | 13,922
Level 3 [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 85,095 | 85,360
Derivative contracts: |  |
Derivative contracts, total | 3,038 | 2,375
Total | 96,839 | 93,681
Derivative contracts: |  |
Derivative contracts | 6,607 | 6,253
Total | 6,607 | 6,253
Level 3 [Member] | Interest Rate Lock Commitments [Member] |  |
Derivative contracts: |  |
Derivative contracts, total | 3,038 | 2,375
Derivative contracts: |  |
Derivative contracts | 4,402 | 3,653
Level 3 [Member] | Auction Rate Securities [Member] |  |
Securities owned: |  |
Securities owned, at fair value | 85,025 | 85,124
Level 3 [Member] | Auction Rate Securities Commitments to Purchase [Member] |  |
Derivative contracts: |  |
Derivative contracts | 2,205 | 2,600
Level 3 [Member] | Investments Included in Other Assets [Member] |  |
Securities owned: |  |
Investments | 8,706 | 5,946
Level 3 [Member] | Municipal Obligations [Member] |  |
Securities owned: |  |
Securities owned, at fair value | $ 70 | $ 236

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