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, 2023	Dec. 31, 2022	Dec. 31, 2021
Natural gas and oil properties:
Properties subject to depletion	[1]	$ 10,435,611	$ 9,855,287	$ 9,338,236
Unproved properties	[1]	789,871	800,592	837,334
Total	[1]	11,225,482	10,655,879	10,175,570
Accumulated depreciation, depletion and amortization	[1]	(5,107,801)	(4,765,475)	(4,420,914)
Natural gas and oil properties, successful efforts method, net	[1]	$ 6,117,681	$ 5,890,404	$ 5,754,656

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