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Restructuring Charges - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Restructuring And Related Activities [Abstract]        
Restructuring charges $ 773 $ 678 $ 1,493 $ 2,903