Fair Value Measurements - Additional Information (Detail)	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) Counterparty	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Interest and dividends	$ 124,000		$ 184,000	$ 272,000	$ 363,000
Mark-to-market gain (loss)	7,600,000		$ 1,500,000	(3,000,000.0)	6,600,000
Deficiency charges	18,200,000
Allowance for doubtful accounts on accounts receivable	5,901,000			$ 5,901,000		$ 8,784,000
Number of derivative counterparties | Counterparty				21
Number of counter parties that are not participants in bank credit facility | Counterparty				5
Counterparties not in Facility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Net derivative asset	(5,100,000)			$ (5,100,000)
One Counterparty Not in Facility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Net derivative asset	$ 473,000			$ 473,000
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
Processing agreement extended period		10 years
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