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Financial Instruments - Additional Information (Detail) (USD $) | 6 Months Ended | 12 Months Ended |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  | 3 Months Ended | 6 Months Ended |  |  |  |  | 6 Months Ended |  | 6 Months Ended |  | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 ForwardContracts | Dec. 31, 2012 | Jun. 30, 2013 Deferred Compensation Share Based Payments [Member] Corporate Equities Liabilities [Member] | Dec. 31, 2012 Deferred Compensation Share Based Payments [Member] Corporate Equities Liabilities [Member] | Jun. 30, 2013 Interest Rate Cap [Member] | Jun. 30, 2012 Interest Rate Cap [Member] | Jun. 30, 2012 Interest Rate Cap [Member] | Dec. 31, 2012 Senior Secured Credit Note [Member] | Jun. 30, 2013 Senior Secured Notes [Member] | Jun. 30, 2013 Corporate [Member] | Jun. 30, 2013 Other Than Corporate Customer [Member] | Jun. 30, 2013 Credit Concentration Risk [Member] | Jun. 30, 2012 Credit Concentration Risk [Member] | Jun. 30, 2013 Credit Concentration Risk [Member] | Jun. 30, 2012 Credit Concentration Risk [Member] | Jun. 30, 2013 Reverse Repurchase Agreements [Member] | Dec. 31, 2012 Reverse Repurchase Agreements [Member] | Jun. 30, 2013 Securities Borrowed Transactions [Member] | Dec. 31, 2012 Securities Borrowed Transactions [Member] | Jun. 30, 2013 Warehouse Facility [Member] Credit Concentration Risk [Member] | Jun. 30, 2013 Lehman Brothers International Europe [Member] | Jun. 30, 2013 Two Major U.S Broker [Member] | Jun. 30, 2013 U.S. Treasury Notes Securities [Member] Contract | Jun. 30, 2013 U.S. Treasury Notes Securities [Member] Fixed Income Investments [Member] | Jun. 30, 2013 Auction Rate Securities [Member] | Jun. 30, 2013 Auction Rate Securities [Member] Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the corporate equities that are included in securities owned |  |  | $ 13,300,000 | $ 14,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company purchased and holds auction rate securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 83,300,000 |
Commitment to purchase ARS from clients through 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,900,000 |
Commitment to purchase ARS period maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2016
ARS held in proprietary trading account result of the failed auctions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000 |
Valuation adjustment (unrealized loss) for ARS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,600,000 |
Assets and liabilities transferred from level one and level two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Interest rate |  |  |  |  |  |  |  |  | 8.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan position held in secondary loan trading portfolio | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the reverse repurchase agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the repurchase agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date of interest rate cap contract |  | December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Credit Note reference rate description |  |  |  |  |  |  |  | 3-Month LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  | 573 | 19,775 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flow hedges used for asset and liability management |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of foreign exchange option outstanding | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward or delayed delivery of the underlying instrument with settlement | 180 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of open short contract |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 355 |  |  |
Open short contract, period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |
Open contracts for Federal Funds futures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,110 |  |  |
Open contracts for Federal Funds futures with a fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,000 | 401,000 |  |
Bank call loans | 219,800,000 | 128,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized loans, collateralized by firm |  |  |  |  |  |  |  |  |  | 157,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized loans, collateralized by customer securities |  |  |  |  |  |  |  |  |  |  | 255,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer securities under customer margin loans available to be pledged | 1,300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer securities under customer margin loans agreement available to be repledged | 201,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,600,000 | 14,300,000 | 3,500,000,000 | 1,200,000,000 |  |  |  |  |  |  |
Customer securities deposited to secure obligations and margin requirements under option contracts | 402,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities received as collateral under securities borrowed transaction with market value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 185,600,000 | 354,000,000 | 3,500,000,000 | 1,200,000,000 |  |  |  |  |  |  |
Carrying value of pledged securities owned that can be sold or re-pledged by the counterparty | 550,000,000 | 570,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of securities owned by the Company loaned or pledged | 157,900,000 | 159,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lehman Brothers International (Europe) held securities with a fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,800,000 |  |  |  |  |
Receivable from brokers and clearing organizations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66,500,000 |  |  |  |
Guaranteed mortgages for a period |  |  |  |  |  |  |  |  |  |  |  | 15 days |  | 15 days |  |  |  |  |  |  |  |  |  |  |  |
Outstanding under the warehouse facility line |  |  |  |  |  |  |  |  |  |  |  | 12,000,000 |  | 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate under warehouse facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 month LIBOR |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  | $ 149,200 | $ 158,000 | $ 291,300 | $ 401,000 |  |  |  |  |  |  |  |  |  |  |

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