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, 2022	Dec. 31, 2021	Dec. 31, 2020
Natural gas and oil properties:
Properties subject to depletion	[1]	$ 9,855,287	$ 9,338,236	$ 8,891,348
Unproved properties	[1]	800,592	837,334	859,766
Total	[1]	10,655,879	10,175,570	9,751,114
Accumulated depreciation, depletion and amortization	[1]	(4,765,475)	(4,420,914)	(4,064,305)
Natural gas and oil properties, successful efforts method, net	[1]	$ 5,890,404	$ 5,754,656	$ 5,686,809

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