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Financial instruments - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Bank
ForwardContracts
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loan position held in secondary loan trading portfolio $ 0 $ 0  
Fair value of the reverse repurchase agreements       
Fair value of the repurchase agreements       
Interest rate swap expiration date Dec. 31, 2012    
Net gain on the interest rate swaps, after tax   69,000 450,900
Senior Secured Credit Note reference rate description 3-Month LIBOR    
Derivatives instruments gain recognized income 28,000    
Number of foreign exchange option outstanding 0    
Forward or delayed delivery of the underlying instrument with settlement 180 days    
Bank call loans 128,300,000 27,500,000  
Number of money center banks 2    
Customer securities under customer margin loans available to be pledged 1,500,000,000    
Amount repledged of customer securities under customer margin loan 171,200,000    
Customer securities deposited to secure obligations and margin requirements under option contracts 339,800,000    
Outstanding letters of credit 0    
Gross balances of reverse repurchase agreements 1,200,000,000 5,500,000,000  
Gross balances of repurchase agreements 1,600,000,000 6,100,000,000  
Carrying value of pledged securities owned that can be sold or re-pledged by the counterparty 570,000,000 653,700,000  
Carrying value of securities owned by the Company loaned or pledged 159,400,000 119,800,000  
U.S. Treasury Notes Securities [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Number of open short contract 380    
Open short contract, period 10 years    
Open contracts for Federal Funds futures with a fair value 286,000,000    
Federal Funds [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Open contracts for Federal Funds futures 6,000,000,000    
Open contracts for Federal Funds futures with a fair value 120,000,000    
Corporate [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized loans, collateralized by firm 158,200,000    
Other Than Corporate Customer [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized loans, collateralized by customer securities 225,800,000    
Reverse Repurchase Agreement [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Amount repledged of customer securities under customer margin loan 14,300,000 44,000,000  
Securities received as collateral under securities borrowed transaction with market value 354,000,000 209,900,000  
Securities Borrowed Transactions [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Amount repledged of customer securities under customer margin loan 1,200,000,000 5,500,000,000  
Securities received as collateral under securities borrowed transaction with market value 1,200,000,000 5,500,000,000  
Two Major U.S Broker [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Receivable from brokers and clearing organizations 78,600,000    
Lehman Brothers International Europe [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Lehman Brothers International (Europe) held securities with a fair value 7,500,000    
Credit Concentration Risk [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Utilization of warehouse facility 0 65,900,000  
Warehouse facility excess retention        
Guaranteed mortgages for a period 10 days    
Outstanding under the warehouse facility line 8,100,000    
Variable interest rate under warehouse facility 1 month LIBOR plus 1.85%    
Variable interest rate 1.85%    
Interest expense 895,000.0 1,700,000  
Deferred Compensation Share Based Payments [Member] | Corporate equities liabilities [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of the corporate equities that are included in securities owned 14,000,000 13,200,000  
Senior Secured Credit Note [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior Secured Credit Note reference rate description 3-Month LIBOR    
Swaps [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate swap expiration date   Mar. 31, 2011  
Interest Rate Cap [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest expense 19,780    
Auction Rate Securities [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Company purchased and holds auction rate securities 77,100,000    
Commitment to purchase ARS from clients through 2016 38,300,000    
ARS held in proprietary trading account result of the failed auctions 150,000    
Valuation adjustment (unrealized loss) for ARS 7,700,000    
Assets and liabilities transferred from level one and level two $ 0    
Auction Rate Securities [Member] | Maximum [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Commitment to purchase ARS period maximum 2016