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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2013
Fair Value Disclosures [Abstract]  
Measurement of Assets and Liabilities at Fair Value on Recurring Basis

The following tables set forth the Company’s financial assets and liabilities that were measured at fair value on a recurring basis during the periods ended June 30, 2013 and December 31, 2012, by level, within the fair value hierarchy:

 

                                                               
     As of June 30, 2013  
     Level 1      Level 2      Level 3      Total  

Trading securities

    $  4,049       $ —         $ —         $ 4,049   

Interest rate cap

      —           239         —           239   

 

                                                               
     As of December 31, 2012  
     Level 1      Level 2     Level 3      Total  

Trading securities

    $ 4,245       $ —        $ —         $ 4,245   

Interest rate swap

      —           (418 )      —           (418 ) 

Foreign exchange forward contract

      —           (1,475 )         (1,475 ) 

Metal commodity swaps

      —           (11 )         (11 )