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Property, Plant and Equipment - Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]    
Land $ 2,089 $ 2,089
Buildings and improvements 45,147 43,950
Machinery and equipment 243,392 237,434
Furniture and fixtures 6,320 5,656
Construction in-progress and deposits 4,120 2,471
Property, plant and equipment, gross, total 301,068 291,600
Accumulated depreciation and amortization (259,712) (254,026)
Net balance $ 41,356 $ 37,574