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Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 138,099 $ 133,241
Less accumulated depreciation (89,639) (83,215)
Total Property, plant and equipment 48,460 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 14,419 14,380
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 109,223 107,899
Office furniture, fixtures and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 4,957 4,698
Automotive equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 491 374
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 6,551 $ 3,432