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Related Party (Tables)
9 Months Ended
Sep. 30, 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  
   
    Nine Months Ended September 30,  
    2012     2011  
    (In thousands)  

Commissions

  $ 1,480     $ 5,080  

Technology products and services

    35       115  

Information and user access fees

    24       140  

Investment income

    20       66  

Other income

    11       51  

General and administrative

    7       60