Selected Quarterly Financial Data (Unaudited) - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Selected Quarterly Financial Information [Line Items]
Proved and unproved impairment expense	$ 1,095,634	$ 0	$ 0	$ 0	$ 0	$ 0	$ 15,302	$ 7,312	$ 1,095,634	$ 22,614	$ 63,679
Goodwill impairment expense					1,641,197	0	0	0	0	1,641,197	0
Unproved impairment expense	1,193,711	$ 16,202	$ 12,770	$ 12,659	$ 441,750	$ 6,549	$ 54,922	$ 11,773	$ 1,235,342	$ 514,994	$ 269,725
North Louisiana Assets
Selected Quarterly Financial Information [Line Items]
Proved and unproved impairment expense	$ 2,300,000