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Long-Term Bank Debt - Additional Information (Detail) (USD $)
9 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Equipment Loan [Member]
Jul. 31, 2013
Equipment Loan [Member]
Aug. 31, 2014
Additional Equipment Loan [Member]
Sep. 30, 2014
Additional Equipment Loan [Member]
Jul. 29, 2014
Additional Equipment Loan [Member]
Sep. 30, 2014
Minimum [Member]
Sep. 30, 2014
Maximum [Member]
Sep. 30, 2014
Interest Rate Swap [Member]
Debt Instrument [Line Items]                    
Credit facility borrowing capacity $ 250,000,000                  
Maturity date of amended and restated credit agreement Jul. 30, 2017                  
Credit facility borrowing base 160,000,000                  
Credit facility, interest rate description The Company's borrowing rates in the credit facility provide for base rate loans at the prime rate (3.25% at September 30, 2014) plus applicable margin utilization rates that range from 1.50% to 2.00%, and LIBO rate loans at LIBO published rates plus applicable utilization rates (2.50% to 3.00% at September 30, 2014). At September 30, 2014, the Company had in place one base rate loan and one LIBO rate loan with effective rates of 4.75% and 2.65%, respectively.                  
Percentage for base rate loans at the prime rate 3.25%   3.95%     3.40%       0.563%
Minimum range for applicable margin utilization rate 1.50%                  
Maximum range for applicable margin utilization rate 2.00%                  
Debt instrument interest one base rate basis for effective rate 4.75%                  
LIBOR rate loans               2.50% 3.00%  
Effective LIBOR loan rate 2.65%                  
Outstanding borrowings under revolving credit facility 86,500,000                  
Weighted-average interest rate of borrowings 3.32%                  
Credit facility remaining borrowing capacity 73,500,000         1,200,000        
Debt instrument basis weighted average interest rate spread on variable rate 3.48% 3.53%                
Equipment Loan, face amount       10,000,000     6,000,000      
Equipment Loan, monthly payment     184,000     87,800        
Equipment Loan, maturity date     Jul. 31, 2018     Jul. 31, 2019        
Company's bank debt     8,000,000     4,800,000       75,000,000
Additional equipment Loan, drawings         4,800,000          
Interest swap agreements period                   2 years
Commenced date                   Jan. 31, 2014
Settlement of interest rate swaps                   $ 210,000