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Long-Term Debt - Senior Secured Credit Facility - Additional Information (Detail) - USD ($)
9 Months Ended
Jul. 27, 2016
Jul. 28, 2015
Sep. 30, 2016
May 19, 2016
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]            
Senior Secured Credit Facility     $ 94,500,000   $ 87,000,000 $ 49,000,000
Senior Secured Credit Facility            
Debt Instrument [Line Items]            
Senior secured credit facility sub limit     $ 2,500,000      
Senior Secured Credit Facility | Minimum            
Debt Instrument [Line Items]            
Commitment fee percentage     0.375%      
Senior Secured Credit Facility | Maximum            
Debt Instrument [Line Items]            
Commitment fee percentage     0.50%      
Third Amendment to Credit Agreement and Limited Waiver (the Amendment)            
Debt Instrument [Line Items]            
Line of credit facility commitment fee percentage 0.50%          
Leverage ratio 400.00%          
Third Amendment to Credit Agreement and Limited Waiver (the Amendment) | Letter of Credit            
Debt Instrument [Line Items]            
Increase margin on loans 0.75%          
Third Amendment to Credit Agreement and Limited Waiver (the Amendment) | Quarter Period Ending June 30, 2016            
Debt Instrument [Line Items]            
Leverage ratio 475.00%          
Third Amendment to Credit Agreement and Limited Waiver (the Amendment) | Quarter Period Ending September 30, 2016            
Debt Instrument [Line Items]            
Leverage ratio 450.00%          
Third Amendment to Credit Agreement and Limited Waiver (the Amendment) | Quarter Period Ending December 31, 2016            
Debt Instrument [Line Items]            
Leverage ratio 425.00%          
Third Amendment to Credit Agreement and Limited Waiver (the Amendment) | All Periods Thereafter            
Debt Instrument [Line Items]            
Leverage ratio 400.00%          
Third Amendment to Credit Agreement and Limited Waiver (the Amendment) | ABR            
Debt Instrument [Line Items]            
Increase margin on loans 0.75%          
Third Amendment to Credit Agreement and Limited Waiver (the Amendment) | Eurodollar            
Debt Instrument [Line Items]            
Increase margin on loans 0.75%          
Citibank N A | Senior Secured Credit Facility            
Debt Instrument [Line Items]            
Debt instrument expanded borrowing base       $ 120,000,000 180,000,000  
Debt instrument maturity date   Oct. 16, 2018        
Senior Secured Credit Facility     $ 94,500,000   $ 87,000,000  
Citibank N A | Senior Secured Credit Facility | LIBOR            
Debt Instrument [Line Items]            
Debt instrument basis spread on variable rate   0.25%        
Wells Fargo Led Facility            
Debt Instrument [Line Items]            
Debt instrument face amount   $ 400,000,000        
LRAI | Senior Secured Credit Facility | Maximum            
Debt Instrument [Line Items]            
Lien percentage of assets for senior secured credit facility     80.00%      
LRAI | Senior Secured Credit Facility | LIBOR            
Debt Instrument [Line Items]            
Debt instrument basis spread on variable rate   1.00%        
Margin of loans, minimum   1.75%        
Margin of loans, maximum   2.75%        
LRAI | Senior Secured Credit Facility | Federal Funds Effective Rate            
Debt Instrument [Line Items]            
Debt instrument basis spread on variable rate   0.50%        
LRAI | Senior Secured Credit Facility | ABR            
Debt Instrument [Line Items]            
Margin of loans, minimum   0.75%        
Margin of loans, maximum   1.75%        
LRAI | Third Amendment to Credit Agreement and Limited Waiver (the Amendment) | Minimum            
Debt Instrument [Line Items]            
Percentage of value of oil and gas properties that must be mortgaged as collateral 90.00% 80.00%        
LRAI | Citibank N A | Senior Secured Credit Facility            
Debt Instrument [Line Items]            
Debt instrument face amount   $ 500,000,000