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Property and Equipment (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property and equipment - gross $ 317,022 $ 310,348
Less accumulated depreciation and amortization (123,154) (118,221)
Property and equipment - net 193,868 192,127
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 $ 131,300 114,131
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 $ 102,996 80,919
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 $ 5,015 5,015
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 $ 10,355 10,465
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 $ 7,118 $ 39,580