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Long-Term Bank Debt - Additional Information (Detail) - USD ($)
1 Months Ended 6 Months Ended 9 Months Ended
Jun. 26, 2015
Dec. 31, 2014
Aug. 31, 2014
Jun. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Jul. 29, 2014
Jul. 31, 2013
Credit Agreement [Member]                
Debt Instrument [Line Items]                
Maturity date of amended and restated credit agreement         Jul. 30, 2017      
Credit facility borrowing base         $ 112,500,000      
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, 2015) 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, 2015). At September 30, 2015, the Company had in place one base rate loan and one LIBO rate loan with effective rates of 5.00% and 2.95%, respectively.      
Outstanding borrowings under revolving credit facility         $ 84,500,000      
Weighted-average interest rate of borrowings         3.44%      
Credit facility remaining borrowing capacity         $ 28,000,000      
Interest swap agreements period         2 years      
Settlement of interest rate swaps         $ 217,000 $ 210,000    
Revolving Line of Credit and Letter of Credit Facility [Member] | Credit Agreement [Member]                
Debt Instrument [Line Items]                
Credit facility borrowing capacity         $ 250,000,000      
Prime Rate [Member] | Credit Agreement [Member]                
Debt Instrument [Line Items]                
Debt instrument, interest rate, effective percentage         3.25%      
Base Rate [Member] | Credit Agreement [Member]                
Debt Instrument [Line Items]                
Debt instrument, interest rate, effective percentage         5.00%      
London Interbank Offered Rate (LIBOR) [Member] | Credit Agreement [Member]                
Debt Instrument [Line Items]                
Debt instrument, interest rate, effective percentage         2.95%      
Base Rate And Libor [Member] | Credit Agreement [Member]                
Debt Instrument [Line Items]                
Debt instrument basis weighted average interest rate spread on variable rate         3.39% 3.48%    
Equipment Loan [Member]                
Debt Instrument [Line Items]                
Debt instrument, interest rate, effective percentage         3.95%      
Company's bank debt         $ 6,000,000      
Equipment Loan, face amount               $ 10,000,000
Equipment Loan, monthly payment         $ 184,000      
Equipment Loan, maturity date         Jul. 31, 2018      
Additional Equipment Loan [Member] | Equipment Loans [Member]                
Debt Instrument [Line Items]                
Debt instrument, interest rate, effective percentage     3.40%          
Credit facility remaining borrowing capacity     $ 1,200,000          
Company's bank debt         $ 4,300,000      
Equipment Loan, face amount             $ 6,000,000  
Equipment Loan, monthly payment     87,800          
Equipment Loan, maturity date         Jul. 31, 2019      
Additional equipment Loan, drawings   $ 500,000 $ 4,800,000          
Equipment Loan, interest rate description         Interim draws on this facility carried a floating interest rate, payable monthly at the LIBO published rate plus 2.50% and on June 26, 2015 converted into a fixed term loan requiring monthly payments      
Additional Equipment Loan [Member] | Fixed Term Loan [Member] | Equipment Loans [Member]                
Debt Instrument [Line Items]                
Equipment Loan, monthly payment $ 8,700              
Equipment Loan, maturity date         Jun. 26, 2020      
Additional Equipment Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Equipment Loans [Member]                
Debt Instrument [Line Items]                
LIBOR rate loans       2.50%        
Minimum [Member] | Prime Rate [Member] | Credit Agreement [Member]                
Debt Instrument [Line Items]                
LIBOR rate loans         1.50%      
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Credit Agreement [Member]                
Debt Instrument [Line Items]                
LIBOR rate loans         2.50%      
Maximum [Member] | Prime Rate [Member] | Credit Agreement [Member]                
Debt Instrument [Line Items]                
LIBOR rate loans         2.00%      
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Credit Agreement [Member]                
Debt Instrument [Line Items]                
LIBOR rate loans         3.00%      
Interest Rate Swap [Member] | Credit Agreement [Member]                
Debt Instrument [Line Items]                
Swap agreement date         2012-07      
Commenced date         2014-01      
Company's bank debt         $ 75,000,000      
Interest Rate Swap [Member] | London Interbank Offered Rate (LIBOR) [Member] | Credit Agreement [Member]                
Debt Instrument [Line Items]                
Percentage for base rate loans at the prime rate         0.563%