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Restructuring Charges - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Restructuring and Related Activities [Abstract]          
Restructuring (reversal) charges $ (244,000) $ 1,789,000 $ 395,000 $ 3,843,000  
Restructuring liability $ 1,600,000   $ 1,600,000   $ 4,900,000