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Net Capital Requirements and Customer Protection Requirements (Tables)
12 Months Ended
Dec. 31, 2012
Net Capital Requirements and Customer Protection Requirements [Abstract]  
Net capital requirements and customer protection requirements
                         
    MarketAxess     MarketAxess     MarketAxess  
    Corporation     Europe Limited     Canada Limited  
          (In thousands)        

Net capital

  $ 63,624     $ 13,151     $ 479  

Minimum net capital required

    2,266       2,943       277  
   

 

 

   

 

 

   

 

 

 

Excess net capital

  $ 61,358     $ 10,208     $ 202