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Other Financial Statement Information - Property, Plant and Equipment - Net (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property and equipment - Gross $ 240,179 $ 231,229
Less accumulated depreciation 135,041 130,768
Property and equipment - Net 105,138 100,461
Land and Improvements [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment - Gross 14,770 12,141
Buildings and Improvements [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment - Gross 71,963 69,963
Machinery and Equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment - Gross 144,724 141,940
Construction in Progress [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment - Gross $ 8,722 $ 7,185