Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 139,591	$ 133,241
Less accumulated depreciation	(91,619)	(83,215)
Total Property, plant and equipment	47,972	50,026
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	2,458	2,458
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 14,726	14,380
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Useful Life	10 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Useful Life	30 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 113,506	107,899
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Useful Life	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Useful Life	15 years
Office furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 4,997	4,698
Office furniture, fixtures and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Useful Life	3 years
Office furniture, fixtures and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Useful Life	10 years
Automotive equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 491	374
Automotive equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Useful Life	3 years
Automotive equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Useful Life	6 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 3,413	$ 3,432
Construction in progress | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Useful Life	3 years
Construction in progress | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Useful Life	15 years