Supplemental Information on Oil and Gas Producing Activities (Unaudited) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Capitalized Costs Relating to Oil and Gas Producing Activities
Proved properties	$ 12,646,303	$ 12,260,713
Unproved properties	1,042,118	1,175,178
Total oil and gas properties	13,688,421	13,435,891
Accumulated depletion	(4,229,300)	(3,818,279)
Net capitalized costs	9,459,121	9,617,612
Costs Incurred in Certain Oil and Gas Activities
Unproved property	79,138	45,129	$ 88,682
Development costs	581,352	823,271	1,104,336
Exploration costs	19,822	2,993	149,782
Total costs incurred	680,312	871,393	1,342,800
Results of Operations for Oil and Gas Producing Activities
Revenues	5,790,759	3,083,905	3,643,873
Operating expenses:
Production expenses	2,793,877	2,736,478	2,417,509
Exploration expenses	1,164	1,083	884
Depletion	735,687	854,331	884,350
Impairment of unproved properties	90,523	223,770	1,300,444
Results of operations before income tax (expense) benefit	2,169,508	(731,757)	(959,314)
Income tax (expense) benefit	520,168	(176,061)	224,511
Results of operations	$ 2,689,676	$ (907,818)	$ (734,803)