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Property, Plant and Equipment - Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]    
Land $ 2,089 $ 2,089
Buildings and improvements 44,647 43,800
Machinery and equipment 231,305 228,663
Furniture and fixtures 5,652 5,905
Construction in-progress and deposits 3,839 2,568
Property, plant and equipment, gross, total 287,532 283,025
Accumulated depreciation and amortization (250,082) (245,638)
Net balance $ 37,450 $ 37,387