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Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 56,495 $ 58,945
Securities segregated for regulatory and other purposes 17,087 11,499
Deposits with clearing organizations 3,500 9,095
Securities owned    
Securities owned, at fair value 868,890 759,742
Investments 12,221  
TBAs 1,750 3,188
Total 1,003,568 902,988
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 111,076 173,450
Investments 432 258
Derivative contracts 2,770 3,057
TBAs 1,599 175
Total 115,877 176,940
Corporate Equities [Member]
    
Securities owned    
Securities owned, at fair value 45,132 43,708
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 43,757 29,884
Other [Member]
    
Securities owned    
Securities owned, at fair value 68,432 65,291
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 76 425
U.S. Treasury Obligations [Member]
    
Securities owned    
Securities owned, at fair value 557,004 497,546
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 46,242 131,899
U.S. Agency Obligations [Member]
    
Securities owned    
Securities owned, at fair value 27,023 27,690
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 7,769 31
Sovereign Obligations [Member]
    
Securities owned    
Securities owned, at fair value 2,068 19
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 1,015  
Corporate Debt and Other Obligations [Member]
    
Securities owned    
Securities owned, at fair value 11,979 14,428
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 3,187 1,858
Mortgage and Other Asset-Backed Securities [Member]
    
Securities owned    
Securities owned, at fair value 3,246 2,920
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 5 18
Municipal Obligations [Member]
    
Securities owned    
Securities owned, at fair value 93,155 59,010
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 795 467
Convertible Bonds [Member]
    
Securities owned    
Securities owned, at fair value 60,851 49,130
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 8,230 8,868
Other [Member]
    
Securities owned    
Securities owned, at fair value 68,432 65,291
Other [Member]
    
Securities owned    
Investments 55,846 60,519
Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 56,495 58,945
Securities segregated for regulatory and other purposes 17,087 11,499
Deposits with clearing organizations 3,500 9,095
Securities owned    
Securities owned, at fair value 601,629 534,291
Total 679,069 624,307
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 84,297 153,170
Investments 432 258
Derivative contracts 401 286
Total 85,130 153,714
Level 1 [Member] | Corporate Equities [Member]
    
Securities owned    
Securities owned, at fair value 34,486 31,958
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 30,247 20,946
Level 1 [Member] | Other [Member]
    
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 76 325
Level 1 [Member] | U.S. Treasury Obligations [Member]
    
Securities owned    
Securities owned, at fair value 557,004 497,546
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 46,242 131,899
Level 1 [Member] | U.S. Agency Obligations [Member]
    
Securities owned    
Securities owned, at fair value 8,450  
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 7,732  
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 1,689 2,328
Level 1 [Member] | Other [Member]
    
Securities owned    
Investments 358 10,477
Level 2 [Member]
    
Securities owned    
Securities owned, at fair value 188,882 153,054
TBAs 1,750 3,188
Total 233,146 193,330
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 26,779 20,180
Derivative contracts 40 124
TBAs 1,599 175
Total 28,418 20,479
Level 2 [Member] | Corporate Equities [Member]
    
Securities owned    
Securities owned, at fair value 10,646 11,750
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 13,510 8,938
Level 2 [Member] | U.S. Agency Obligations [Member]
    
Securities owned    
Securities owned, at fair value 18,573 27,690
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 37 31
Level 2 [Member] | Sovereign Obligations [Member]
    
Securities owned    
Securities owned, at fair value 2,068 19
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 1,015  
Level 2 [Member] | Corporate Debt and Other Obligations [Member]
    
Securities owned    
Securities owned, at fair value 11,979 11,969
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 3,187 1,858
Level 2 [Member] | Mortgage and Other Asset-Backed Securities [Member]
    
Securities owned    
Securities owned, at fair value 3,179 2,880
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 5 18
Level 2 [Member] | Municipal Obligations [Member]
    
Securities owned    
Securities owned, at fair value 81,586 49,616
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 795 467
Level 2 [Member] | Convertible Bonds [Member]
    
Securities owned    
Securities owned, at fair value 60,851 49,130
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value 8,230 8,868
Level 2 [Member] | Other [Member]
    
Securities owned    
Investments 42,514 37,088
Level 3 [Member]
    
Securities owned    
Securities owned, at fair value 78,379 72,397
Total 91,353 85,351
Securities sold, but not yet purchased    
Securities sold, but not yet purchased at fair value   100
Derivative contracts 2,329 2,647
Total 2,329 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 67 40
Level 3 [Member] | Municipal Obligations [Member]
    
Securities owned    
Securities owned, at fair value 11,569 9,394
Level 3 [Member] | Other [Member]
    
Securities owned    
Securities owned, at fair value 66,743 62,963
Level 3 [Member] | Other [Member]
    
Securities owned    
Investments $ 12,974 $ 12,954