Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities (Unaudited) - Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (Detail) - USD ($) $ in Thousands		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Natural gas and oil properties:
Properties subject to depletion	[1]	$ 11,058,771	$ 10,435,611	$ 9,855,287
Unproved properties	[1]	819,656	789,871	800,592
Total	[1]	11,878,427	11,225,482	10,655,879
Accumulated depreciation, depletion and amortization	[1]	(5,456,727)	(5,107,801)	(4,765,475)
Natural gas and oil properties, successful efforts method, net	[1]	$ 6,421,700	$ 6,117,681	$ 5,890,404

[1] (a) Includes capitalized asset retirement costs and the associated accumulated amortization.