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Property, Equipment and Software, Net (Tables)
12 Months Ended
Dec. 31, 2011
Property, Equipment and Software, Net [Abstract]  
Summary of Property, Equipment and Software, Net
                 
    2011     2010  

Leasehold improvements

  $ 46,150     $ 35,997  

Furniture and fixtures

    23,666       21,742  

Equipment

    63,303       60,924  

Software

    180,607       152,987  
   

 

 

   

 

 

 
      313,726       271,650  

Less accumulated depreciation and amortization

    (203,124     (174,683
   

 

 

   

 

 

 
    $ 110,602     $ 96,967