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Debt - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 26, 2015
Dec. 31, 2014
Aug. 31, 2014
Sep. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
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       $ 80,000,000 $ 80,000,000      
Credit facility, interest rate description         The Company's borrowing rates in the credit facility provide for base rate loans at the prime rate (3.5% at September 30, 2016) plus applicable margin utilization rates that range from 1.75% to 2.50%, and LIBO rate loans at LIBO published rates plus applicable utilization rates (2.75% to 3.50% at September 30, 2016). At September 30, 2016, the Company had in place one LIBO rate loan with an effective rate of 3.77%.      
Outstanding borrowings under revolving credit facility       $ 65,000,000 $ 65,000,000      
Weighted-average interest rate of borrowings       4.49% 4.49%      
Credit facility remaining borrowing capacity       $ 15,000,000 $ 15,000,000      
Interest swap agreements period         2 years      
Settlement of interest rate swaps         $ 7,000 $ 217,000    
Additional Equipment Loan [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       2,950,000 $ 2,950,000      
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      
Revolving Line of Credit and Letter of Credit Facility [Member] | Credit Agreement [Member]                
Debt Instrument [Line Items]                
Credit facility borrowing capacity       $ 250,000,000 $ 250,000,000      
Fixed Term Loan [Member] | Additional Equipment Loan [Member]                
Debt Instrument [Line Items]                
Equipment Loan, monthly payment $ 8,700              
Equipment Loan, maturity date         Jun. 26, 2020      
Prime Rate [Member] | Credit Agreement [Member]                
Debt Instrument [Line Items]                
Debt instrument, interest rate, effective percentage       3.50% 3.50%      
London Interbank Offered Rate (LIBOR) [Member] | Credit Agreement [Member]                
Debt Instrument [Line Items]                
Debt instrument, interest rate, effective percentage       3.77% 3.77%      
London Interbank Offered Rate (LIBOR) [Member] | Additional Equipment Loan [Member]                
Debt Instrument [Line Items]                
LIBOR rate loans         2.50%      
Base Rate And Libor [Member] | Credit Agreement [Member]                
Debt Instrument [Line Items]                
Debt instrument basis weighted average interest rate spread on variable rate       3.82% 3.82% 3.39%    
Equipment Loan [Member]                
Debt Instrument [Line Items]                
Debt instrument, interest rate, effective percentage       3.95% 3.95%      
Company's bank debt       $ 3,380,000 $ 3,380,000      
Equipment Loan, face amount               $ 10,000,000
Equipment Loan, monthly payment         $ 184,000      
Equipment Loan, maturity date         Jul. 31, 2018      
Minimum [Member] | Prime Rate [Member] | Credit Agreement [Member]                
Debt Instrument [Line Items]                
LIBOR rate loans         1.75%      
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Credit Agreement [Member]                
Debt Instrument [Line Items]                
LIBOR rate loans         2.75%      
Maximum [Member] | Prime Rate [Member] | Credit Agreement [Member]                
Debt Instrument [Line Items]                
LIBOR rate loans         2.50%      
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Credit Agreement [Member]                
Debt Instrument [Line Items]                
LIBOR rate loans         3.50%      
Interest Rate Swap [Member] | Credit Agreement [Member]                
Debt Instrument [Line Items]                
Swap agreement date         2012-07      
Commenced date         2014-01      
Termination date         2016-01      
Company's bank debt       $ 75,000,000 $ 75,000,000      
Interest Rate Swap [Member] | London Interbank Offered Rate (LIBOR) [Member] | Credit Agreement [Member]                
Debt Instrument [Line Items]                
Debt instrument, interest rate       0.563% 0.563%