Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (Detail) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Natural gas properties:
Properties subject to depletion	[1]	$ 10,592,394	$ 10,435,611
Unproved properties	[1]	800,994	789,871
Total	[1]	11,393,388	11,225,482
Accumulated depletion and depreciation	[1]	(5,193,291)	(5,107,801)
Natural gas and oil properties, successful efforts method, net	[1]	$ 6,200,097	$ 6,117,681

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