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Financial Instruments - Additional Information (Detail) (USD $)
 1 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 26, 2013
Sep. 30, 2013
Dealer
ForwardContracts
Dec. 31, 2012
Sep. 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]
Dec. 31, 2012
Senior Secured Credit Note [Member]
Sep. 30, 2013
Senior Secured Notes [Member]
Sep. 30, 2013
Corporate [Member]
Sep. 30, 2013
Other Than Corporate Customer [Member]
Sep. 30, 2013
Credit Concentration Risk [Member]
Sep. 30, 2012
Credit Concentration Risk [Member]
Sep. 30, 2013
Credit Concentration Risk [Member]
Sep. 30, 2012
Credit Concentration Risk [Member]
Sep. 30, 2013
Reverse Repurchase Agreements [Member]
Dec. 31, 2012
Reverse Repurchase Agreements [Member]
Sep. 30, 2013
Securities Borrowed Transactions [Member]
Dec. 31, 2012
Securities Borrowed Transactions [Member]
Sep. 30, 2013
Warehouse Facility [Member]
Credit Concentration Risk [Member]
Sep. 30, 2012
Caps [Member]
Sep. 30, 2013
Caps [Member]
Sep. 30, 2012
Caps [Member]
Dec. 31, 2012
Caps [Member]
Sep. 30, 2013
Four Major U.S. Broker [Member]
Sep. 30, 2013
U.S. Treasury Notes Securities [Member]
Contract
Sep. 30, 2013
U.S. Treasury Notes Securities [Member]
Fixed Income Investments [Member]
Sep. 30, 2013
Auction Rate Securities [Member]
Sep. 30, 2013
Auction Rate Securities [Member]
Sep. 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       $ 14,100,000 $ 14,000,000                                              
Company purchased and holds auction rate securities                                                   85,900,000 85,900,000  
Commitment to purchase ARS from clients through 2016                                                   36,200,000 36,200,000  
Commitment to purchase ARS period maximum                                                       2016
ARS held in proprietary trading account result of the failed auctions                                                   150,000 150,000  
Valuation adjustment (unrealized loss) for ARS                                                   7,900,000 7,900,000  
Assets and liabilities transferred from level one and level two                                                   0 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                                     Dec. 31, 2012   Dec. 31, 2012 Dec. 31, 2012            
Senior Secured Credit Note reference rate description           3-Month LIBOR                                            
Interest expense                                                          
Cash flow hedges used for asset and liability management                                       0                
Number of foreign exchange option outstanding   0                                                    
Number of open short contract                                               468        
Open short contract, period                                               10 years        
Open contracts for Federal Funds futures                                               1,184        
Open contracts for Federal Funds futures with a fair value                                               180,000 771,000      
Forward or delayed delivery of the underlying instrument with settlement   180 days                                                    
Bank call loans   94,800,000 128,300,000                                                  
Collateralized loans, collateralized by firm               132,500,000                                        
Collateralized loans, collateralized by customer securities                 225,100,000                                      
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   206,000,000                       2,600,000,000 1,200,000,000 34,800,000 14,300,000                      
Customer securities deposited to secure obligations and margin requirements under option contracts   335,200,000                                                    
Outstanding letters of credit   0                                                    
Securities received as collateral under securities borrowed transaction with market value                           2,600,000,000 1,200,000,000 289,700,000 354,000,000                      
Carrying value of pledged securities owned that can be sold or re-pledged by the counterparty   805,400,000 570,000,000                                                  
Carrying value of securities owned by the Company loaned or pledged   133,900,000 159,400,000                                                  
Amount of first interim distribution 9,500,000                                                      
Fair value of the company's investment on reserves not paid in first distribution   274,000                                                    
Receivable from brokers and clearing organizations                                             204,900,000          
Number of broker-dealers   4                                                    
Loans to Citizens   0                                                    
Guaranteed mortgages for a period                       15 days                                
Outstanding under the warehouse facility line                                   49,100,000                    
Variable interest rate under warehouse facility                                   1 month LIBOR                    
Interest expense                   $ 183,000 $ 305,000 $ 616,000 $ 705,000