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Summary of Significant Accounting Policies - Additional Information 1 (Detail)
 1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 7 Months Ended 9 Months Ended
Aug. 14, 2018
USD ($)
$ / shares
$ / bbl
$ / Mcf
shares
Aug. 13, 2018
USD ($)
Jul. 31, 2018
USD ($)
a
Well
Location
Apr. 27, 2018
USD ($)
Sep. 30, 2018
USD ($)
a
Aug. 13, 2018
USD ($)
Sep. 30, 2018
USD ($)
a
Sep. 30, 2017
USD ($)
Aug. 13, 2018
USD ($)
Aug. 13, 2018
USD ($)
Sep. 30, 2018
USD ($)
a
$ / bbl
$ / Mcf
Sep. 30, 2017
USD ($)
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Jones contribution transaction, ownership percentage 84.00%                      
Jones contribution transaction, Shares issued | shares 88,571,429                      
Jones contribution transaction, share price | $ / shares $ 7.00                      
Purchase price allocation period 12 months                      
Success fee for contribution transaction   $ 8,100,000       $ 8,100,000     $ 8,100,000 $ 8,100,000    
Recognized stock-based compensation expense   7,200,000                    
Unrecognized stock-based compensation expense   11,900,000       11,900,000     11,900,000 11,900,000    
Jones contribution transaction             $ 36,365,000   43,200,000      
Deferred tax liability adjustment to additional paid-in capital                     $ 77,900,000  
Deferred tax liability related to tax basis of long-lived assets         $ 52,400,000   52,400,000       52,400,000  
Loss on sale of oil and gas properties             (98,000)          
Working interests re-acquired under the joint venture $ 17,900,000                      
Impairment of oil and gas properties             0          
Goodwill 349,667,000       349,667,000   349,667,000       $ 349,667,000  
Annual goodwill impairment test, description                     The Company will perform its first annual review of goodwill impairment starting on October 1, 2019.  
Cash flow hedges derivative instruments         $ 0   $ 0       $ 0  
Predecessor                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Transaction-related costs           2,600,000            
Loss on sale of oil and gas properties               $ 1,060,000   35,438,000   $ 1,060,000
Loss resulting from final settlement for property sale                   2,700,000    
Impairment of oil and gas properties           0   $ 0   0   $ 0
Predecessor | North Louisiana and Texas Properties                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Acquired oil and gas properties     $ 39,300,000                  
Oil and gas properties, gross acres | a     23,000                  
Oil and gas properties, net acres | a     12,000                  
Producing natural gas wells, gross | Well     120                  
Producing natural gas wells, net | Well     26.2                  
Producing Haynesville shale natural gas wells, gross | Well     49                  
Producing Haynesville shale natural gas wells, net | Well     14.7                  
Potential drilling locations, gross | Location     112                  
Potential drilling locations, net | Location     31.0                  
Potential operated drilling locations, gross | Location     21                  
Potential operated drilling locations, net | Location     17.9                  
Predecessor | South Texas Sold Properties                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Gross proceeds from sale of oil and gas properties       $ 125,000,000                
Effective date of sale       Nov. 01, 2017                
Bakken Shale Properties                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Oil and gas property cost basis 397,600,000                      
Oil and gas property capitalized costs 554,300,000                      
Oil and gas property accumulated depletion, depreciation and amortization $ 156,700,000                      
Goodwill Oil and Gas Property Valuation                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Management's oil price outlook | $ / bbl 79.72                      
Management's gas price outlook | $ / Mcf 3.87                      
Annual minimum discount rate 10.00%                      
Annual maximum discount rate 25.00%                      
South Texas Asset Held for Sale                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Management's oil price outlook | $ / bbl                     72.03  
Management's gas price outlook | $ / Mcf                     4.31  
Annual minimum discount rate                     20.00%  
Annual maximum discount rate                     25.00%  
Undeveloped Acres | a         8,400   8,400       8,400  
Proceeds from sale of undeveloped acreage         $ 13,700,000              
South Texas Asset Held for Sale | Predecessor                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Assets held for sale, fair value   $ 55,000,000       $ 55,000,000     $ 55,000,000 55,000,000    
Loss on sale of oil and gas properties                   $ 32,700,000