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Long-Term Debt - Additional Information (Details)
3 Months Ended 6 Months Ended 7 Months Ended
Feb. 10, 2017
USD ($)
Oct. 04, 2016
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
May 11, 2017
USD ($)
Oct. 03, 2019
Oct. 03, 2018
Oct. 03, 2017
Debt Instrument                    
Gain on extinguishment of debt     $ 0 $ 0 $ 1,151,000 $ 0        
Amended New Credit Facility | LIBOR | Minimum                    
Debt Instrument                    
Basis spread on variable rate 3.00%                  
Amended New Credit Facility | LIBOR | Maximum                    
Debt Instrument                    
Basis spread on variable rate 4.00%                  
Amended New Credit Facility | Base Rate | Minimum                    
Debt Instrument                    
Basis spread on variable rate 2.00%                  
Amended New Credit Facility | Base Rate | Maximum                    
Debt Instrument                    
Basis spread on variable rate 3.00%                  
Revolving Credit Facility | New First Lien Exit Facility                    
Debt Instrument                    
Maximum borrowing capacity   $ 425,000,000.0                
Cash collateral released $ 50,000,000.0                  
Revolving Credit Facility | Amended New Credit Facility                    
Debt Instrument                    
Maximum borrowing capacity 600,000,000.0                  
Borrowing base $ 425,000,000.0                  
Commitment fee 0.50%                  
Percentage of proved reserves pledged as collateral 95.00%                  
Total net leverage ratio (no greater than)     3.50   3.50          
Interest coverage ratio (no less than)     2.25   2.25          
Aggregate principal amount of default trigger $ 25,000,000.0                  
Default trigger related to judgment liability 25,000,000.0                  
Debt outstanding     $ 0   $ 0          
Outstanding letters of credit     $ 6,200,000   6,200,000          
Secured Notes | New Building Note                    
Debt Instrument                    
Face amount of debt instrument $ 35,000,000.0 35,000,000.0                
Fair Value   36,600,000                
Gain on extinguishment of debt         $ 1,200,000          
Annual interest rate                   6.00%
Interest costs paid-in-kind             $ 1,300,000      
Term of interest payments paid in kind (after refinancing or repayment)             90 days      
Proceeds remitted to unsecured creditors   $ 26,800,000                
Forecast | Secured Notes | New Building Note                    
Debt Instrument                    
Annual interest rate               10.00% 8.00%