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Summary of Significant Accounting Policies - Additional Information 2 (Detail)
 1 Months Ended 3 Months Ended
May 05, 2021
MMBTU
$ / MMBTU
Mar. 31, 2021
USD ($)
MMBTU
product
$ / shares
$ / EquityUnit
$ / MMBTU
shares
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
shares
Operations And Summary Of Significant Accounting Policies [Line Items]        
Fair value of derivative net liability   $ 1,100,000    
Cash flow hedges derivative instruments   0    
Stock-based compensation expense recognized   $ 1,690,000 $ 1,430,000  
Number of primary products | product   2    
Contract cash settlement max days   25 days    
Contract cancellable notice term   30 days    
Oil and gas sales   $ 126,503,000   $ 125,016,000
Natural Gas Swap Contracts        
Operations And Summary Of Significant Accounting Policies [Line Items]        
Volume (in MMBTU) | MMBTU   182,878,737    
Average price | $ / MMBTU   2.54    
Natural Gas Swap Contracts | Subsequent Event        
Operations And Summary Of Significant Accounting Policies [Line Items]        
Volume (in MMBTU) | MMBTU 14,600,000      
Average price | $ / MMBTU 2.70      
Restricted Stock        
Operations And Summary Of Significant Accounting Policies [Line Items]        
Shares of unvested restricted stock outstanding (in shares) | shares   1,034,506   1,038,006
Weighted average grant date fair value of stock grants per share (in dollars per share) | $ / shares   $ 5.80    
Unrecognized compensation cost related to unvested restricted stock   $ 3,700,000    
Period in which compensation cost expected to be recognized   1 year 7 months 6 days    
Potential Performance Shares (PSU)        
Operations And Summary Of Significant Accounting Policies [Line Items]        
Period in which compensation cost expected to be recognized   1 year 6 months    
Number of performance stock units ("PSUs") outstanding (in shares) | shares   1,136,488    
Weighted average grant date fair value of PSUs per unit (in dollars per share) | $ / EquityUnit   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   $ 4,100,000    
General and Administrative Expense        
Operations And Summary Of Significant Accounting Policies [Line Items]        
Stock-based compensation expense recognized   1,700,000 $ 1,400,000  
Interest Rate Swap Contracts        
Operations And Summary Of Significant Accounting Policies [Line Items]        
Outstanding under the bank credit facility   $ 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%