Property, Plant and Equipment, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment, Gross [Abstract]
Property, plant and equipment, at cost	$ 343,142	$ 290,478
Accumulated depreciation	(196,251)	(185,356)
Accumulated amortization of capital leases	(2,915)	(2,829)
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]
Property And Equipment Net Excluding Work In Progress	143,976	102,293
Construction in progress	16,819	12,140
Total property, plant and equipment, net	160,795	114,433
Land
Property, Plant and Equipment, Gross [Abstract]
Property, plant and equipment, at cost	3,981	2,636
Land | Assets Held Under Capital Leases
Property, Plant and Equipment, Gross [Abstract]
Property, plant and equipment, at cost	226	546
Buildings and improvements
Property, Plant and Equipment, Gross [Abstract]
Property, plant and equipment, at cost	$ 74,397	55,887
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 | 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
Property, Plant and Equipment, Gross [Abstract]
Property, plant and equipment, at cost	$ 4,806	4,798
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
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
Machinery and equipment
Property, Plant and Equipment, Gross [Abstract]
Property, plant and equipment, at cost	$ 226,675	195,125
Machinery and equipment | Minimum
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]
Property, plant and equipment useful life	5 years
Machinery and equipment | Maximum
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]
Property, plant and equipment useful life	25 years
Office equipment
Property, Plant and Equipment, Gross [Abstract]
Property, plant and equipment, at cost	$ 31,504	30,622
Office equipment | Minimum
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]
Property, plant and equipment useful life	2 years
Office equipment | Maximum
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]
Property, plant and equipment useful life	8 years
Vehicles
Property, Plant and Equipment, Gross [Abstract]
Property, plant and equipment, at cost	$ 1,553	$ 864
Vehicles | Minimum
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]
Property, plant and equipment useful life	3 years
Vehicles | Maximum
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]
Property, plant and equipment useful life	6 years