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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