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Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Property and equipment - gross $ 127,424 $ 127,874
Less accumulated depreciation (100,943) (100,952)
Total property and equipment, net 26,481 26,922
Land    
Property Plant And Equipment [Line Items]    
Property and equipment - gross 875 875
Buildings    
Property Plant And Equipment [Line Items]    
Property and equipment - gross $ 17,389 17,389
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 $ 34,957 34,957
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 $ 62,681 62,681
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 $ 3,106 3,556
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 $ 8,416 $ 8,416