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Summary of Property, Plant and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 133,235 $ 131,419
Less accumulated depreciation (81,087) (78,951)
Total Property, plant and equipment 52,148 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 14,237 14,167
Machinery and equipment
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 97,124 94,184
Office furniture, fixtures and equipment
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 9,932 9,717
Automotive equipment
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 288 278
Construction in progress
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 9,196 $ 10,615