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Financial Instruments - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Financial Instrument At Fair Value [Line Items]          
Securities Owned $ 1,041,590,000   $ 1,041,590,000   $ 924,541,000
Loan position held in secondary loan trading portfolio 0   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    
Forward or delayed delivery of the underlying instrument with settlement     180 days    
Bank call loans 94,600,000   94,600,000   27,500,000
Number of money center banks     2    
Customer securities under customer margin loans available to be pledged 1,100,000,000   1,100,000,000    
Customer securities under customer margin loans agreement available to be re-pledged 198,200,000   198,200,000    
Customer securities deposited to secure obligations and margin requirements under option contracts 46,400,000   46,400,000    
Outstanding letters of credit 0   0    
Gross balances of reverse repurchase agreements 4,300,000,000   4,300,000,000   5,500,000,000
Gross balances of repurchase agreements 5,100,000,000   5,100,000,000   6,100,000,000
Carrying value of pledged securities owned that can be sold or re-pledged by the counterparty 725,400,000   725,400,000   653,700,000
Carrying value of securities owned by the Company loaned or pledged 171,300,000   171,300,000   119,800,000
Receivable from brokers and clearing organizations 361,589,000   361,589,000   288,113,000
Credit Concentration Risk [Member]
          
Financial Instrument At Fair Value [Line Items]          
Interest expense 305,000 332,000 705,000 1,100,000  
Utilization of warehouse facility 61,200,000   61,200,000   65,900,000
Warehouse facility excess retention             
Guaranteed mortgages for a period 10 days   10 days    
Outstanding under the warehouse facility line 27,000,000   27,000,000    
Variable interest rate under warehouse facility     1 month LIBOR plus 1.85%    
Variable interest rate     1.85%    
U.S. Treasury Notes Securities [Member]
          
Financial Instrument At Fair Value [Line Items]          
Number of open short contract 420   420    
Open contracts for Federal Funds futures with a fair value 290,000,000   290,000,000    
Federal Funds [Member]
          
Financial Instrument At Fair Value [Line Items]          
Open contracts for Federal Funds futures 7,700,000,000   7,700,000,000    
Open contracts for Federal Funds futures with a fair value 209,808,000   209,808,000    
Lehman Brothers International Europe [Member]
          
Financial Instrument At Fair Value [Line Items]          
Lehman Brothers International (Europe) held securities with a fair value 7,500,000   7,500,000    
Two Major U.S Broker [Member]
          
Financial Instrument At Fair Value [Line Items]          
Receivable from brokers and clearing organizations 112,900,000   112,900,000    
Reverse Repurchase Agreement [Member]
          
Financial Instrument At Fair Value [Line Items]          
Customer securities under customer margin loans agreement available to be re-pledged 10,400,000   10,400,000   44,000,000
Securities received as collateral under securities borrowed transaction with market value 183,200,000   183,200,000   209,900,000
Securities Borrowed Transactions [Member]
          
Financial Instrument At Fair Value [Line Items]          
Customer securities under customer margin loans agreement available to be re-pledged 4,400,000,000   4,400,000,000   5,500,000,000
Securities received as collateral under securities borrowed transaction with market value 4,400,000,000   4,400,000,000   5,500,000,000
Corporate [Member]
          
Financial Instrument At Fair Value [Line Items]          
Collateralized loans, collateralized by firm and customer securities 111,500,000   111,500,000    
Other Than Corporate Customer [Member]
          
Financial Instrument At Fair Value [Line Items]          
Collateralized loans, collateralized by firm and customer securities 46,400,000   46,400,000    
Senior Secured Credit Note [Member]
          
Financial Instrument At Fair Value [Line Items]          
Senior secured credit note reference rate description     3-Month LIBOR    
Auction Rate Securities [Member]
          
Financial Instrument At Fair Value [Line Items]          
Company purchased and holds auction rate securities 79,600,000   79,600,000    
Commitment to purchase ARS from clients through 2016 40,500,000   40,500,000    
ARS held in proprietary trading account result of the failed auctions 150,000   150,000    
Valuation adjustment (unrealized loss) for ARS 5,300,000   5,300,000    
Assets and liabilities transferred from level one and level two 0        
Auction Rate Securities [Member] | Maximum [Member]
          
Financial Instrument At Fair Value [Line Items]          
Commitment to purchase ARS period maximum     2016    
Deferred Compensation Share Based Payments [Member] | Corporate equities liabilities [Member]
          
Financial Instrument At Fair Value [Line Items]          
Securities Owned $ 13,800,000   $ 13,800,000   $ 13,200,000