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Investments (Tables)
3 Months Ended
Mar. 31, 2013
Investments Debt And Equity Securities [Abstract]  
Summary of Available-for-Sale Securities

Available-for-sale securities consisted of the following:

 

     Adjusted
Cost
     Gross
Unrealized
Gain
     Gross
Unrealized
Loss
    Fair Value  

March 31, 2013

          

Registered investment companies

   $ 5,459       $  —         $ (318   $ 5,141   
  

 

 

    

 

 

    

 

 

   

 

 

 

December 31, 2012

          

Registered investment companies

   $ 4,830       $ 53       $ —        $ 4,883