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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

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