Fair Value Measurements - Additional Information (Detail)	3 Months Ended			9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2021 USD ($) Counterparty	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Implied volatilities				42.00%
Interest and dividends	$ 314,000	$ 114,000		$ 541,000	$ 385,000
Mark-to-market gain (loss)	(1,200,000)	3,200,000		3,100,000	$ 234,000,000
Impairment of proved properties and other assets				0
Allowance for doubtful accounts on accounts receivable	373,000			$ 373,000		$ 3,004,000
Number of derivative counterparties | Counterparty				19
Number of counter parties that are not participants in bank credit facility | Counterparty				5
One Counterparty Not in Facility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Net derivative asset	9,200,000			$ 9,200,000
Four Counterparties Not in Facility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Net derivative asset	$ 2,400,000			2,400,000
Fair Value, Inputs, Level 2 | Leases
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment of proved properties and other assets		$ 2,000,000.0
North Louisiana | Fair Value, Inputs, Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment of proved properties and other assets			$ 77,000,000.0
Maximum | North Louisiana | Contingent Consideration
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Potential contractual payout of contingent consideration				$ 75,000,000.0
Measurement Input, Price Volatility | Weighted Average | Swaptions | Natural Gas
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Implied volatilities				40.00%
Measurement Input, Price Volatility | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Implied volatilities				36.00%
Measurement Input, Price Volatility | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Implied volatilities				55.00%