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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
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