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Summary of Significant Accounting Policies - Additional Information 2 (Detail)
 1 Months Ended 3 Months Ended 6 Months Ended
Aug. 07, 2020
bbl
MMBTU_per_day
$ / MMBTU
$ / bbl
Jun. 30, 2020
USD ($)
MMBTU
bbl
Unit
$ / shares
$ / MMBTU
$ / bbl
$ / EquityUnit
shares
Jun. 30, 2020
USD ($)
MMBTU
bbl
Unit
$ / shares
$ / MMBTU
$ / bbl
$ / EquityUnit
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
MMBTU
bbl
Unit
Product
$ / shares
$ / MMBTU
$ / bbl
$ / EquityUnit
shares
Jun. 30, 2019
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
shares
Operations And Summary Of Significant Accounting Policies [Line Items]                
Derivative contracts settlement frequency         monthly      
Fair value of derivative net liability   $ 2,800,000 $ 2,800,000   $ 2,800,000      
Cash flow hedges derivative instruments   0 0   0      
Stock-based compensation expense recognized         $ 2,982,000 $ 1,271,000    
Number of primary products | Product         2      
Contract cash settlement max days         25 days      
Contract cancellable notice term         30 days      
Accounts Receivable related to satisfied performance obligations and unconditional right to consideration   75,369,000 75,369,000   $ 75,369,000     $ 120,111,000
Cumulative-effect adjustment   $ 108,549,000 $ 108,549,000   $ 108,549,000     $ 138,596,000
ASC 326                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Change in accounting principle, accounting standards update, adopted [true false]   true true   true      
Change in accounting principle, accounting standards update, adoption date   Jan. 01, 2020 Jan. 01, 2020   Jan. 01, 2020      
Change in accounting principle, accounting standards update, immaterial effect [true false]   true true   true      
ASC 326 | Adjustment                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Cumulative-effect adjustment             $ 0  
Restricted Stock                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Weighted average grant date fair value of stock grants per share | $ / shares   $ 5.96 $ 5.96   $ 5.96      
Shares of unvested restricted stock outstanding | shares   1,481,889 1,481,889   1,481,889     1,092,309
Unrecognized compensation cost related to unvested restricted stock   $ 6,600,000 $ 6,600,000   $ 6,600,000      
Period in which compensation cost expected to be recognized         2 years 1 month 6 days      
Restricted Stock | Directors and Employees                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Number of shares, Granted | shares   514,258            
Weighted average grant date fair value of stock grants per share | $ / shares   $ 5.38 $ 5.38   $ 5.38      
Potential Performance Shares (PSU)                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Period in which compensation cost expected to be recognized         2 years 1 month 6 days      
Number of performance stock units ("PSUs") outstanding | Unit   1,136,488 1,136,488   1,136,488      
Weighted average grant date fair value of PSUs per unit | $ / EquityUnit   9.33 9.33   9.33      
Minimum final number of shares of common stock issuable based on performance multiplier | shares         0      
Maximum final number of shares of common stock issuable based on performance multiplier | shares         2,272,976      
Unrecognized expense, performance share units         $ 6,700,000      
General and Administrative Expense                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Stock-based compensation expense recognized     $ 1,600,000 $ 600,000 $ 3,000,000.0 $ 1,300,000    
Natural Gas 2-Way Collar Contracts                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Volume | MMBTU   107,250,000 107,250,000   107,250,000      
Ceiling, Average price | $ / MMBTU   2.89 2.89   2.89      
Floor, Average price | $ / MMBTU   2.45 2.45   2.45      
Crude Oil Contracts, in Barrels                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Volume | bbl   532,100 532,100   532,100      
Ceiling, Average price | $ / bbl   63.89 63.89   63.89      
Floor, Average price | $ / bbl   49.25 49.25   49.25      
Subsequent Event | Natural Gas 2-Way Collar Contracts                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Volume | MMBTU_per_day 10,000              
Ceiling, Average price | $ / MMBTU 3.00              
Floor, Average price | $ / MMBTU 2.50              
Natural gas production year April 2021 to March 2022              
Subsequent Event | Crude Oil Contracts, in Barrels                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Volume | bbl 182,500              
Ceiling, Average price | $ / bbl 45.00              
Floor, Average price | $ / bbl 40.00              
Basis Swap Contracts                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Volume | MMBTU   36,590,000 36,590,000   36,590,000      
Fair value of derivative net asset   $ 1,100,000 $ 1,100,000   $ 1,100,000      
Derivative contracts settlement, month and year         2022-12      
Interest Rate Swap Contracts                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Outstanding under the bank credit facility   $ 500,000,000.0 $ 500,000,000.0   $ 500,000,000.0      
Interest Rate Swap Contracts | LIBOR                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Outstanding bank credit facility percentage         0.33%