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Net Capital Requirements and Customer Protection Requirements (Tables)
6 Months Ended
Jun. 30, 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

  $ 66,293     $ 28,001     $ 406  

Minimum net capital required

    1,619       3,212       271  
   

 

 

   

 

 

   

 

 

 

Excess net capital

  $ 64,674     $ 24,789     $ 135