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Long-Term Debt - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Nov. 30, 2012
Dec. 31, 2011
Dec. 31, 2012
First Amendment
Rantoul Partners
Dec. 31, 2012
Second Amendment
Dec. 31, 2012
Second Amendment
Minimum
Dec. 31, 2012
Third Amendment
Dec. 31, 2012
Line of Credit
Federal Funds Rate
Dec. 31, 2012
Line of Credit
Base Rate
Minimum
Dec. 31, 2012
Line of Credit
Base Rate
Maximum
Dec. 31, 2012
Line of Credit
Floating Rate
Minimum
Dec. 31, 2012
Line of Credit
Floating Rate
Maximum
Dec. 31, 2012
Long-Term Debt [Member]
Debt Instrument [Line Items]                          
Debt instrument interest rate, margin               0.50% 0.00% 0.75% 2.25% 3.00%  
Line of credit facility, maximum borrowing capacity       $ 50,000,000 $ 50,000,000   $ 50,000,000            
Line of credit facility, current borrowing capacity         7,000,000   12,150,000            
Debt Instrument, Interest Rate Increase           3.75              
Provision To Repurchase Common Stock             2,000,000            
Long-term Debt, Weighted Average Interest Rate 7.20%                        
Less current portion 0   7,000                    
Credit Facility                         $ 8,500,000
Debt Instrument, Interest Rate, Stated Percentage   0.24%     3.75%