Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2012
Fair Value Measurements [Abstract]  
Summary of financial assets and liabilities measured at fair value on a recurring basis
                                 
    Fair Value Measurements as of
December 31, 2012
 
     Level 1     Level 2     Level 3     Total  

Liabilities

                               

Interest rate swap agreements

  $ —       $ (645   $ —       $ (645

Foreign currency exchange contracts

    —         (2,010     —         (2,010

 

                                 
    Fair Value Measurements as of
December 31, 2011
 
     Level 1     Level 2     Level 3     Total  

Assets

                               

Foreign currency exchange contracts

  $ —       $ 168     $ —       $ 168  

Liabilities

                               

Interest rate swap agreements

    —         (1,014     —         (1,014

Foreign currency exchange contracts

    —         (2,371     —         (2,371