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Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 140,179 $ 139,591
Less accumulated depreciation (93,746) (91,619)
Total Property, plant and equipment 46,433 47,972
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 14,982 14,726
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 116,818 113,506
Office furniture, fixtures and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 4,895 4,997
Automotive equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 510 491
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 516 $ 3,413