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Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
ASSETS    
Cash equivalents $ 48,476 $ 58,945
Securities segregated for regulatory and other purposes 11,500 11,499
Deposits with clearing organizations 9,094 9,095
Securities owned    
Securities owned, at fair value 1,082,469 759,742
Investments 5,439  
TBAs 3,403 3,188
Total 1,216,436 902,988
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 243,065 173,450
Investments 408 258
Derivative contracts 3,387 3,057
TBAs 536 175
Total 247,396 176,940
Corporate Equities [Member]
    
Securities owned    
Securities owned, at fair value 50,740 43,708
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 40,663 29,884
Other [Member]
    
Securities owned    
Securities owned, at fair value 68,604 65,291
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 241 425
U.S. Treasury Securities [Member]
    
Securities owned    
Securities owned, at fair value 774,540 497,546
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 164,770 131,899
U.S. Agency Securities [Member]
    
Securities owned    
Securities owned, at fair value 29,233 27,690
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 5,025 31
Sovereign Obligations [Member]
    
Securities owned    
Securities owned, at fair value 1,813 19
Corporate Debt and Other Obligations [Member]
    
Securities owned    
Securities owned, at fair value 29,622 14,428
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 12,115 1,858
Mortgage and Other Asset-Backed Securities [Member]
    
Securities owned    
Securities owned, at fair value 3,626 2,920
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 4 18
Municipal Obligations [Member]
    
Securities owned    
Securities owned, at fair value 77,421 59,010
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 629 467
Convertible Bonds [Member]
    
Securities owned    
Securities owned, at fair value 46,870 49,130
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 19,618 8,868
Other [Member]
    
Securities owned    
Securities owned, at fair value 68,604 65,291
Investments Included in Other Assets [Member]
    
Securities owned    
Investments 61,494 60,519
Level 1 [Member]
    
ASSETS    
Cash equivalents 48,476 58,945
Securities segregated for regulatory and other purposes 11,500 11,499
Deposits with clearing organizations 9,094 9,095
Securities owned    
Securities owned, at fair value 838,394 534,291
Total 918,100 624,307
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 210,673 153,170
Investments 408 258
Derivative contracts 771 286
Total 211,852 153,714
Level 1 [Member] | Corporate Equities [Member]
    
Securities owned    
Securities owned, at fair value 50,740 31,958
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 40,663 20,946
Level 1 [Member] | Other [Member]
    
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 241 325
Level 1 [Member] | U.S. Treasury Securities [Member]
    
Securities owned    
Securities owned, at fair value 774,540 497,546
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 164,770 131,899
Level 1 [Member] | U.S. Agency Securities [Member]
    
Securities owned    
Securities owned, at fair value 11,675  
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 4,999  
Level 1 [Member] | Corporate Debt and Other Obligations [Member]
    
Securities owned    
Securities owned, at fair value   2,459
Level 1 [Member] | Other [Member]
    
Securities owned    
Securities owned, at fair value 1,439 2,328
Level 1 [Member] | Investments Included in Other Assets [Member]
    
Securities owned    
Investments 10,636 10,477
Level 2 [Member]
    
Securities owned    
Securities owned, at fair value 163,408 153,054
TBAs 3,403 3,188
Total 211,543 193,330
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 32,392 20,180
Derivative contracts 204 124
TBAs 536 175
Total 33,132 20,479
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] | U.S. Agency Securities [Member]
    
Securities owned    
Securities owned, at fair value 17,558 27,690
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 26 31
Level 2 [Member] | Sovereign Obligations [Member]
    
Securities owned    
Securities owned, at fair value 1,813 19
Level 2 [Member] | Corporate Debt and Other Obligations [Member]
    
Securities owned    
Securities owned, at fair value 29,622 11,969
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 12,115 1,858
Level 2 [Member] | Mortgage and Other Asset-Backed Securities [Member]
    
Securities owned    
Securities owned, at fair value 3,626 2,880
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 4 18
Level 2 [Member] | Municipal Obligations [Member]
    
Securities owned    
Securities owned, at fair value 63,919 49,616
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 629 467
Level 2 [Member] | Convertible Bonds [Member]
    
Securities owned    
Securities owned, at fair value 46,870 49,130
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 19,618 8,868
Level 2 [Member] | Investments Included in Other Assets [Member]
    
Securities owned    
Investments 44,732 37,088
Level 3 [Member]
    
Securities owned    
Securities owned, at fair value 80,667 72,397
Total 86,793 85,351
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value   100
Derivative contracts 2,412 2,647
Total 2,412 2,747
Level 3 [Member] | Other [Member]
    
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value   100
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 13,502 9,394
Level 3 [Member] | Other [Member]
    
Securities owned    
Securities owned, at fair value 67,165 62,963
Level 3 [Member] | Investments Included in Other Assets [Member]
    
Securities owned    
Investments $ 6,126 $ 12,954