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Net Capital Requirements and Customer Protection Requirements (Tables)
3 Months Ended
Mar. 31, 2013
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

  $ 69,812     $ 16,334     $ 478  

Minimum net capital required

    1,585       2,753       270  
   

 

 

   

 

 

   

 

 

 

Excess net capital

  $ 68,227     $ 13,581     $ 208