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Long-Term Debt - Additional Information (Detail) - USD ($)
1 Months Ended 6 Months Ended
Feb. 15, 2017
Jun. 26, 2015
Dec. 31, 2014
Aug. 14, 2014
Jun. 30, 2017
Jun. 30, 2016
Jul. 19, 2017
Jul. 29, 2014
Jul. 31, 2013
Credit Agreement [Member]                  
Debt Instrument [Line Items]                  
Maturity date of amended and restated credit agreement         Jul. 30, 2017        
Outstanding borrowings under revolving credit facility         $ 39,800,000        
Weighted-average interest rate of borrowings         4.87%        
Credit facility remaining borrowing capacity         $ 35,200,000        
Interest swap agreements period         2 years        
Settlement of interest rate swaps           $ 7,000      
Additional Equipment Loan [Member]                  
Debt Instrument [Line Items]                  
Credit facility remaining borrowing capacity       $ 1,200,000          
Company's bank debt         $ 2,410,000        
Equipment Loan, face amount               $ 6,000,000  
Percentage for base rate loans at the prime rate       3.40%          
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, with a rate of 3.50% and requiring monthly payments        
Fair Value Measurements, Valuation Techniques         discounted cash flow model        
Additional Equipment Loan [Member] | Significant Unobservable Inputs (Level 3) [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Fair Value Disclosure         $ 4,710,000,000 $ 7,798,000,000      
2017 Credit Agreement [Member]                  
Debt Instrument [Line Items]                  
Credit facility borrowing capacity $ 300,000,000                
Maturity date of amended and restated credit agreement Feb. 15, 2021                
Credit agreement date Feb. 15, 2017                
Credit facility borrowing base $ 75,000,000                
2017 Credit Agreement [Member] | Subsequent Event [Member]                  
Debt Instrument [Line Items]                  
Credit facility borrowing base             $ 67,000,000    
Revolving Line of Credit and Letter of Credit Facility [Member] | Credit Agreement [Member]                  
Debt Instrument [Line Items]                  
Credit facility borrowing capacity         $ 250,000,000        
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        
Equipment Loan, Interest rate on fixed loans         3.50%        
Base Rate And Libor [Member] | Credit Agreement [Member]                  
Debt Instrument [Line Items]                  
Debt instrument basis weighted average interest rate spread on variable rate         5.20% 3.66%      
London Interbank Offered Rate (LIBOR) [Member] | Additional Equipment Loan [Member]                  
Debt Instrument [Line Items]                  
LIBOR rate loans         2.50%        
Equipment Loan [Member]                  
Debt Instrument [Line Items]                  
Company's bank debt         $ 2,330,000        
Equipment Loan, face amount                 $ 10,000,000
Percentage for base rate loans at the prime rate         3.95%        
Equipment Loan, monthly payment         $ 184,000        
Equipment Loan, maturity date         Jul. 31, 2018        
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        
Interest Rate Swap [Member] | London Interbank Offered Rate (LIBOR) [Member] | Credit Agreement [Member]                  
Debt Instrument [Line Items]                  
Debt instrument, interest rate         0.563%