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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, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, at Carrying Value | $ 77,942 | $ 98,294 | $ 105,357 | $ 135,366
ASSETS |  |  |  |
Cash equivalents | 33,364 | 60,268 |  |
Securities segregated for regulatory and other purposes |  | 11,495 |  |
Deposits with clearing organizations | 16,595 | 10,492 |  |
Securities owned: |  |  |  |
Securities Owned | 806,772 | 856,088 |  |
Investments | 7,718 |  |  |
Loans held for sale | 20,095 | 75,989 |  |
Securities purchased under agreements to resell | 250,000 | 184,000 |  |
Derivative contracts: |  |  |  |
Derivative contracts, total | 7,285 | 4,530 |  |
Total | 1,192,229 | 1,267,309 |  |
Securities sold, but not yet purchased: |  |  |  |
Securities sold, but not yet purchased, at fair value | 128,262 | 76,314 |  |
Investments |  | 648 |  |
Derivative contracts: |  |  |  |
Derivative contracts | 4,542 | 6,574 |  |
Total | 132,804 | 83,536 |  |
Federal Funds Futures [Member] |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 135 | 18 |  |
Eurodollar Future [Member] |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 60 | 44 |  |
general collateral futures [Member] |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 2 |  |  |
To Be Announced Security [Member] |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts, total | 1,774 | 2,155 |  |
Derivative contracts: |  |  |  |
TBAs | 33 | 73 |  |
Interest Rate Lock Commitments [Member] |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts, total | 5,511 | 2,375 |  |
Derivative contracts: |  |  |  |
Derivative contracts | 3,188 | 3,653 |  |
U.S. Treasury Futures [Member] |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 87 | 186 |  |
Auction Rate Securities Purchase Commitment [Member] |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 1,037 | 2,600 |  |
Corporate Equities [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 49,012 | 61,634 |  |
Securities sold, but not yet purchased: |  |  |  |
Securities sold, but not yet purchased, at fair value | 49,457 | 45,336 |  |
Money Markets [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 2,668 | 1,263 |  |
Securities sold, but not yet purchased: |  |  |  |
Securities sold, but not yet purchased, at fair value | 15 | 241 |  |
Auction Rate Securities [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 87,323 | 85,124 |  |
Investments Included in Other Assets [Member] |  |  |  |
Securities owned: |  |  |  |
Investments | 58,118 | 64,447 |  |
U.S. Treasury Securities [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 503,509 | 566,346 |  |
Securities sold, but not yet purchased: |  |  |  |
Securities sold, but not yet purchased, at fair value | 67,472 | 11,837 |  |
U.S. Agency Securities [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 15,067 | 29,448 |  |
Securities sold, but not yet purchased: |  |  |  |
Securities sold, but not yet purchased, at fair value | 24 | 52 |  |
Sovereign Obligations [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 3,434 | 320 |  |
Corporate Debt and Other Obligations [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 19,922 | 14,673 |  |
Securities sold, but not yet purchased: |  |  |  |
Securities sold, but not yet purchased, at fair value | 3,010 | 4,847 |  |
Mortgage and Other Asset-Backed Securities [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 4,792 | 3,395 |  |
Securities sold, but not yet purchased: |  |  |  |
Securities sold, but not yet purchased, at fair value |  | 7 |  |
Municipal Obligations [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 62,250 | 40,166 |  |
Securities sold, but not yet purchased: |  |  |  |
Securities sold, but not yet purchased, at fair value | 55 | 72 |  |
Convertible Bonds [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 58,795 | 53,719 |  |
Securities sold, but not yet purchased: |  |  |  |
Securities sold, but not yet purchased, at fair value | 8,229 | 13,922 |  |
Level 1 [Member] |  |  |  |
ASSETS |  |  |  |
Cash equivalents | 33,364 | 60,268 |  |
Securities segregated for regulatory and other purposes |  | 11,495 |  |
Deposits with clearing organizations | 16,595 | 10,492 |  |
Securities owned: |  |  |  |
Securities Owned | 555,189 | 629,243 |  |
Derivative contracts: |  |  |  |
Total | 605,246 | 722,273 |  |
Securities sold, but not yet purchased: |  |  |  |
Securities sold, but not yet purchased, at fair value | 116,944 | 57,414 |  |
Investments |  | 648 |  |
Derivative contracts: |  |  |  |
Derivative contracts | 284 | 248 |  |
Total | 117,228 | 58,310 |  |
Level 1 [Member] | Federal Funds Futures [Member] |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 135 | 18 |  |
Level 1 [Member] | Eurodollar Future [Member] |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 60 | 44 |  |
Level 1 [Member] | general collateral futures [Member] |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 2 |  |  |
Level 1 [Member] | U.S. Treasury Futures [Member] |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 87 |  |  |
Level 1 [Member] | U.S. Treasury Futures [Member] |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts |  | 186 |  |
Level 1 [Member] | Corporate Equities [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 49,012 | 61,634 |  |
Securities sold, but not yet purchased: |  |  |  |
Securities sold, but not yet purchased, at fair value | 49,457 | 45,336 |  |
Level 1 [Member] | Money Markets [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 2,668 | 1,263 |  |
Securities sold, but not yet purchased: |  |  |  |
Securities sold, but not yet purchased, at fair value | 15 | 241 |  |
Level 1 [Member] | Investments Included in Other Assets [Member] |  |  |  |
Securities owned: |  |  |  |
Investments | 98 | 10,775 |  |
Level 1 [Member] | U.S. Treasury Securities [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 503,509 | 566,346 |  |
Securities sold, but not yet purchased: |  |  |  |
Securities sold, but not yet purchased, at fair value | 67,472 | 11,837 |  |
Level 2 [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 164,131 | 141,485 |  |
Loans held for sale | 20,095 | 75,989 |  |
Securities purchased under agreements to resell | 250,000 | 184,000 |  |
Derivative contracts: |  |  |  |
Derivative contracts, total | 1,774 | 2,155 |  |
Total | 485,597 | 451,355 |  |
Securities sold, but not yet purchased: |  |  |  |
Securities sold, but not yet purchased, at fair value | 11,318 | 18,900 |  |
Derivative contracts: |  |  |  |
Derivative contracts | 33 | 73 |  |
Total | 11,351 | 18,973 |  |
Level 2 [Member] | Eurodollar Future [Member] |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 0 |  |  |
Level 2 [Member] | To Be Announced Security [Member] |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts, total | 1,774 | 2,155 |  |
Derivative contracts: |  |  |  |
TBAs | 33 | 73 |  |
Level 2 [Member] | Federal Funds Futures [Member] |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 0 |  |  |
Level 2 [Member] | Investments Included in Other Assets [Member] |  |  |  |
Securities owned: |  |  |  |
Investments | 49,597 | 47,726 |  |
Level 2 [Member] | U.S. Agency Securities [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 15,067 | 29,448 |  |
Securities sold, but not yet purchased: |  |  |  |
Securities sold, but not yet purchased, at fair value | 24 | 52 |  |
Level 2 [Member] | Sovereign Obligations [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 3,434 | 320 |  |
Level 2 [Member] | Corporate Debt and Other Obligations [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 19,922 | 14,673 |  |
Securities sold, but not yet purchased: |  |  |  |
Securities sold, but not yet purchased, at fair value | 3,010 | 4,847 |  |
Level 2 [Member] | Mortgage and Other Asset-Backed Securities [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 4,792 | 3,395 |  |
Securities sold, but not yet purchased: |  |  |  |
Securities sold, but not yet purchased, at fair value |  | 7 |  |
Level 2 [Member] | Municipal Obligations [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 62,121 | 39,930 |  |
Securities sold, but not yet purchased: |  |  |  |
Securities sold, but not yet purchased, at fair value | 55 | 72 |  |
Level 2 [Member] | Convertible Bonds [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 58,795 | 53,719 |  |
Securities sold, but not yet purchased: |  |  |  |
Securities sold, but not yet purchased, at fair value | 8,229 | 13,922 |  |
Level 3 [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 87,452 | 85,360 |  |
Derivative contracts: |  |  |  |
Derivative contracts, total | 5,511 | 2,375 |  |
Total | 101,386 | 93,681 |  |
Derivative contracts: |  |  |  |
Derivative contracts | 4,225 | 6,253 |  |
Total | 4,225 | 6,253 |  |
Level 3 [Member] | Interest Rate Lock Commitments [Member] |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts, total | 5,511 | 2,375 |  |
Derivative contracts: |  |  |  |
Derivative contracts | 3,188 | 3,653 |  |
Level 3 [Member] | Auction Rate Securities [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | 87,323 | 85,124 |  |
Level 3 [Member] | Auction Rate Securities Purchase Commitment [Member] |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 1,037 | 2,600 |  |
Level 3 [Member] | Investments Included in Other Assets [Member] |  |  |  |
Securities owned: |  |  |  |
Investments | 8,423 | 5,946 |  |
Level 3 [Member] | Municipal Obligations [Member] |  |  |  |
Securities owned: |  |  |  |
Securities Owned | $ 129 | $ 236 |  |

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- Definition Fair value of financial instruments sold short by a broker-dealer for their own account (proprietary securities) for trading or investment purposes determined by management based upon quoted prices of a financial instrument with similar characteristics or on a valuation technique or model. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29643736&loc=d3e42546-110969 + Details
Name: | us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant