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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