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Summary of Property, Plant and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 132,216 $ 131,419
Less accumulated depreciation (81,002) (78,951)
Total Property, plant and equipment 51,214 52,468
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 14,356 14,167
Machinery and equipment
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 106,559 94,184
Office furniture, fixtures and equipment
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 4,844 9,717
Automotive equipment
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 375 278
Construction in progress
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 3,624 $ 10,615