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Related Party (Tables)
12 Months Ended
Dec. 31, 2011
Related Parties [Abstract]  
Summary of balances and transactions with the Stockholder Broker-Dealer Client or affiliates
                 
    As of December 31,  
    2011     2010  
    (In thousands)  

Cash and cash equivalents

  $ 156,982     $ 110,642  

Securities and cash provided as collateral

    550       4,049  

Accounts receivable

    2,255       829  

Accounts payable

    86       66  

 

                         
    Year Ended December 31,  
    2011     2010     2009  
    (In thousands)  

Commissions

  $ 7,045     $ 5,541     $ 14,103  

Technology products and services

    167       16       35  

Information and user access fees

    176       132       243  

Investment income

    90       113       214  

Other income

    66       63       152  

General and administrative

    73       27       79