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Net Capital Requirements and Customer Protection Requirements (Tables)
9 Months Ended
Sep. 30, 2012
Net Capital Requirements and Customer Protection Requirements [Abstract]  
Net capital requirements and customer protection requirements
                         
    MarketAxess
Corporation
    MarketAxess
Europe Limited
    MarketAxess
Canada Limited
 
    (In thousands)  

Net capital

  $ 75,058     $ 13,078     $ 431  

Minimum net capital required

    2,544       2,927       280  
   

 

 

   

 

 

   

 

 

 

Excess net capital

  $ 72,514     $ 10,151     $ 151