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Fair Value Measurements - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Counterparty
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Interest and dividends $ 148,000 $ 179,000  
Mark-to-market gain (loss) (10,500,000) 5,100,000  
Deficiency charges 17,000,000.0    
Allowance for doubtful accounts on accounts receivable $ 9,527,000   $ 8,784,000
Number of derivative counterparties | Counterparty 20    
Number of counter parties that are not participants in bank credit facility | Counterparty 4    
Counterparties not in Facility      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Net derivative asset $ 8,200,000    
North Louisiana | Level 2      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Impairment on natural gas and oil properties $ 77,000,000.0    
Fair Value, Measurements, Nonrecurring | North Louisiana      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Impairment on natural gas and oil properties     $ 1,093,531,000
Natural Gas and Oil Properties | Fair Value, Measurements, Nonrecurring      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Impairment on natural gas and oil properties   $ 0