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Long-Term Debt - Additional Information (Detail) - USD ($)
1 Months Ended 6 Months Ended
Jun. 26, 2015
Dec. 31, 2014
Aug. 31, 2014
Jun. 30, 2015
Jun. 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 June 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 June 30, 2015). At June 30, 2015, the Company had in place one base rate loan and one LIBO rate loan with effective rates of 5.00% and 2.91%, respectively.      
Outstanding borrowings under revolving credit facility       $ 86,000,000      
Weighted-average interest rate of borrowings       3.27%      
Credit facility remaining borrowing capacity       $ 26,500,000      
Interest swap agreements period       2 years      
Settlement of interest rate swaps       $ 146,000 $ 132,000    
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       2.91%      
Base Rate And Libor [Member] | Credit Agreement [Member]              
Debt Instrument [Line Items]              
Debt instrument basis weighted average interest rate spread on variable rate       3.42% 3.53%    
Equipment Loan [Member]              
Debt Instrument [Line Items]              
Debt instrument, interest rate, effective percentage       3.95%      
Company's bank debt       $ 6,600,000      
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 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       $ 4,600,000      
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 Loan [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 Loan [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%