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Related Party (Tables)
3 Months Ended
Mar. 31, 2012
Related Party [Abstract]  
Summary of balances and transactions with the Stockholder Broker-Dealer Client or affiliates
         
    As of  
    December 31,
2011
 
    (In thousands)  

Cash and cash equivalents

  $ 156,982  

Securities and cash provided as collateral

    550  

Accounts receivable

    2,255  

Accounts payable

    86  

 

                 
   
    Three Months Ended March 31,  
    2012     2011  
    (In thousands)  

Commissions

  $ 1,480     $ 1,719  

Technology products and services

    35       —    

Information and user access fees

    24       47  

Investment income

    20       25  

Other income

    11       17  

General and administrative

    7       20