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Related Parties (Tables)
12 Months Ended
Dec. 31, 2012
Related Parties [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  

 

                         
    Year Ended December 31,  
    2012     2011     2010  
    (In thousands)  

Commissions

  $ 1,480     $ 7,045     $ 5,541  

Technology products and services

    35       167       16  

Information and user access fees

    24       176       132  

Investment income

    20       90       113  

Other income

    11       66       63  

General and administrative

    7       73       27