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Summary of Significant Accounting Policies - Additional Information 2 (Detail)
 1 Months Ended 3 Months Ended 9 Months Ended
Nov. 05, 2020
MMBTU
Jun. 30, 2020
shares
Sep. 30, 2020
USD ($)
$ / shares
$ / MMBTU
$ / EquityUnit
shares
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
MMBTU
Product
$ / shares
$ / MMBTU
$ / EquityUnit
shares
Sep. 30, 2019
USD ($)
Oct. 01, 2020
$ / MMBTU
Dec. 31, 2019
USD ($)
shares
Operations And Summary Of Significant Accounting Policies [Line Items]                
Fair value of derivative net liability     $ 2,500,000   $ 2,500,000      
Cash flow hedges derivative instruments     0   0      
Stock-based compensation expense recognized         $ 4,734,000 $ 2,359,000    
Number of primary products | Product         2      
Contract cash settlement max days         25 days      
Contract cancellable notice term         30 days      
Oil and gas sales     $ 87,965,000   $ 87,965,000     $ 120,111,000
Restricted Stock                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Weighted average grant date fair value of stock grants per share (in dollars per share) | $ / shares     $ 5.80   $ 5.80      
Shares of unvested restricted stock outstanding (in shares) | shares     1,044,673   1,044,673     1,092,309
Unrecognized compensation cost related to unvested restricted stock     $ 5,400,000   $ 5,400,000      
Period in which compensation cost expected to be recognized         1 year 10 months 24 days      
Restricted Stock | Directors and Employees                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Granted (in shares) | shares   514,258            
Weighted average grant date fair value of stock grants per share (in dollars per share) | $ / shares     $ 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         1 year 10 months 24 days      
Number of performance stock units ("PSUs") outstanding (in shares) | shares     1,136,488   1,136,488      
Weighted average grant date fair value of PSUs per unit (in dollars per share) | $ / EquityUnit     9.33   9.33      
Minimum final number of shares of common stock issuable based on performance multiplier (in shares) | shares         0      
Maximum final number of shares of common stock issuable based on performance multiplier (in shares) | shares         2,272,976      
Unrecognized expense, performance share units         $ 5,800,000      
General and Administrative Expense                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Stock-based compensation expense recognized     $ 1,800,000 $ 1,100,000 $ 4,700,000 $ 2,400,000    
Natural Gas 2-Way Collar Contracts                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Volume (in MMBTU) | MMBTU         121,870,000      
Average Ceiling | $ / MMBTU     2.94   2.94      
Average Floor | $ / MMBTU     2.45   2.45      
Natural Gas Swaptions Call Contracts                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Volume (in MMBTU) | MMBTU         120,450,000      
Average price | $ / MMBTU     2.52   2.52      
Subsequent Event | Natural Gas 2-Way Collar Contracts                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Volume (in MMBTU) | MMBTU 20,000              
Average Ceiling | $ / MMBTU             3.70  
Average Floor | $ / MMBTU             2.60  
Basis Swap Contracts                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Volume (in MMBTU) | MMBTU         31,070,000      
Fair value of derivative net asset     $ 1,300,000   $ 1,300,000      
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      
Interest Rate Swap Contracts | LIBOR                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Outstanding bank credit facility percentage         0.33%      
Swaption Contracts October 2020 | Subsequent Event | Natural Gas Swaptions Call Contracts                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Volume (in MMBTU) | MMBTU 47,450,000              
Average price | $ / MMBTU             2.53