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Property, Plant and Equipment - Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Abstract]    
Land $ 2,089 $ 2,089
Buildings and improvements 45,170 45,147
Machinery and equipment 208,135 243,392
Furniture and fixtures 7,239 6,320
Construction in-progress and deposits 9,251 4,120
Property, plant and equipment, gross, total 271,884 301,068
Accumulated depreciation and amortization (221,452) (259,712)
Net balance $ 50,432 $ 41,356