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Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property and equipment - gross $ 299,332 $ 287,617
Less accumulated depreciation and amortization (115,799) (111,060)
Property and equipment - net 183,533 176,557
Land
   
Property, Plant and Equipment [Line Items]    
Property and equipment - gross 5,273 5,273
Buildings
   
Property, Plant and Equipment [Line Items]    
Property and equipment - gross 54,948 54,948
Buildings | Minimum
   
Property, Plant and Equipment [Line Items]    
Estimated Useful Life (Years) 39 years  
Buildings | Maximum
   
Property, Plant and Equipment [Line Items]    
Estimated Useful Life (Years) 40 years  
Building Improvements
   
Property, Plant and Equipment [Line Items]    
Property and equipment - gross 114,131 114,099
Building Improvements | Minimum
   
Property, Plant and Equipment [Line Items]    
Estimated Useful Life (Years) 5 years  
Building Improvements | Maximum
   
Property, Plant and Equipment [Line Items]    
Estimated Useful Life (Years) 40 years  
Machinery and Equipment
   
Property, Plant and Equipment [Line Items]    
Property and equipment - gross 81,960 82,189
Machinery and Equipment | Minimum
   
Property, Plant and Equipment [Line Items]    
Estimated Useful Life (Years) 3 years  
Machinery and Equipment | Maximum
   
Property, Plant and Equipment [Line Items]    
Estimated Useful Life (Years) 15 years  
Furniture, fixtures and office equipment
   
Property, Plant and Equipment [Line Items]    
Property and equipment - gross 5,087 5,046
Furniture, fixtures and office equipment | Minimum
   
Property, Plant and Equipment [Line Items]    
Estimated Useful Life (Years) 5 years  
Furniture, fixtures and office equipment | Maximum
   
Property, Plant and Equipment [Line Items]    
Estimated Useful Life (Years) 10 years  
Computer Equipment and Software
   
Property, Plant and Equipment [Line Items]    
Estimated Useful Life (Years) 3 years  
Property and equipment - gross 11,265 11,289
Leasehold Improvements
   
Property, Plant and Equipment [Line Items]    
Estimated Useful Life (Years) 4 years  
Property and equipment - gross 17 17
Construction in Progress
   
Property, Plant and Equipment [Line Items]    
Property and equipment - gross $ 26,651 $ 14,756