XML 43 R32.htm IDEA: XBRL DOCUMENT v3.8.0.1
Long-Term Debt - Additional Information (Detail) - USD ($)
1 Months Ended 9 Months Ended
Feb. 15, 2017
Jun. 26, 2015
Dec. 31, 2014
Aug. 14, 2014
Sep. 30, 2017
Sep. 30, 2016
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         $ 49,800,000      
Weighted-average interest rate of borrowings         4.67%      
Credit facility remaining borrowing capacity         $ 17,200,000      
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         $ 2,140,000      
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         $ 3,941,000,000 $ 6,958,000,000    
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         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         4.98% 3.83%    
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         $ 1,800,000      
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%