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Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 141,195 $ 139,591
Less accumulated depreciation (95,807) (91,619)
Total Property, plant and equipment 45,388 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 15,020 14,726
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 116,928 113,506
Office furniture, fixtures and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 4,947 4,997
Automotive equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 508 491
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 1,334 $ 3,413