Property, Plant and Equipment - Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Land	$ 2,089	$ 2,089
Buildings and improvements	43,950	44,647
Machinery and equipment	237,434	231,305
Furniture and fixtures	5,656	5,652
Construction in-progress and deposits	2,471	3,839
Property, plant and equipment, gross, total	291,600	287,532
Accumulated depreciation and amortization	(254,026)	(250,082)
Net balance	$ 37,574	$ 37,450