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Property and Equipment, net (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 73,095,000 $ 72,880,000  
Less: Accumulated depreciation (62,206,000) (61,101,000)  
Property, plant and equipment, excluding construction in progress, net 10,889,000 11,779,000  
Construction in progress 521,000 370,000  
Total 11,410,000 12,149,000  
Depreciation expense 2,500,000 2,400,000 2,800,000
Minimum
     
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in years) 3 years    
Maximum
     
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in years) 30 years    
Railroad and equipment
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 33,627,000 33,627,000  
Railroad and equipment | Minimum
     
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in years) 15 years    
Railroad and equipment | Maximum
     
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in years) 30 years    
Machinery and equipment
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 18,714,000 18,618,000  
Machinery and equipment | Minimum
     
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in years) 3 years    
Machinery and equipment | Maximum
     
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in years) 10 years    
Office equipment
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 19,154,000 18,909,000  
Office equipment | Minimum
     
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in years) 3 years    
Office equipment | Maximum
     
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in years) 10 years    
Autos and trucks
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 1,600,000 $ 1,726,000  
Autos and trucks | Minimum
     
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in years) 3 years    
Autos and trucks | Maximum
     
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in years) 10 years    
Property, Plant and Equipment [Member] | Minimum
     
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in years) 3 years    
Property, Plant and Equipment [Member] | Maximum
     
Property, Plant and Equipment [Line Items]      
Estimated Useful Life (in years) 30 years