Property, Plant and Equipment, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment, Gross [Abstract]
Property, plant and equipment, at cost	$ 290,478	$ 295,162
Accumulated depreciation	(185,356)	(186,510)
Accumulated amortization of capital leases	(2,829)	(2,944)
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]
Property And Equipment Net Excluding Work In Progress	102,293	105,708
Construction in progress	12,140	9,649
Total property, plant and equipment, net	114,433	115,357
Land
Property, Plant and Equipment, Gross [Abstract]
Property, plant and equipment, at cost	2,636	2,773
Land | Assets Held Under Capital Leases
Property, Plant and Equipment, Gross [Abstract]
Property, plant and equipment, at cost	546	609
Buildings and improvements
Property, Plant and Equipment, Gross [Abstract]
Property, plant and equipment, at cost	$ 55,887	56,562
Buildings and improvements | Maximum
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]
Property, plant and equipment useful life	35 years
Buildings and improvements | Minimum
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]
Property, plant and equipment useful life	10 years
Buildings and improvements | Assets Held Under Capital Leases
Property, Plant and Equipment, Gross [Abstract]
Property, plant and equipment, at cost	$ 4,798	5,345
Buildings and improvements | Assets Held Under Capital Leases | Maximum
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]
Property, plant and equipment useful life	35 years
Buildings and improvements | Assets Held Under Capital Leases | Minimum
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]
Property, plant and equipment useful life	10 years
Machinery and equipment
Property, Plant and Equipment, Gross [Abstract]
Property, plant and equipment, at cost	$ 195,125	197,804
Machinery and equipment | Maximum
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]
Property, plant and equipment useful life	25 years
Machinery and equipment | Minimum
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]
Property, plant and equipment useful life	5 years
Office equipment
Property, Plant and Equipment, Gross [Abstract]
Property, plant and equipment, at cost	$ 30,622	31,139
Office equipment | Maximum
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]
Property, plant and equipment useful life	8 years
Office equipment | Minimum
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]
Property, plant and equipment useful life	2 years
Vehicles
Property, Plant and Equipment, Gross [Abstract]
Property, plant and equipment, at cost	$ 864	$ 930
Vehicles | Maximum
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]
Property, plant and equipment useful life	6 years
Vehicles | Minimum
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]
Property, plant and equipment useful life	3 years