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Summary of Property, Plant and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 124,519 $ 116,159
Less accumulated depreciation (74,691) (70,458)
Total Property, plant and equipment 49,828 45,701
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 12,768 12,537
Machinery and equipment
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 91,364 89,089
Office furniture, fixtures and equipment
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 9,108 8,400
Automotive equipment
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 278 312
Construction in progress
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 8,543 $ 3,363