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Property, Plant and Equipment, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 486,112 $ 513,540
Less: Accumulated depreciation and amortization (317,738) (313,178)
Property, plant and equipment, net $ 168,374 $ 200,362