Costs Incurred for Property Acquisition, Exploration and Development (Detail) - USD ($) $ in Thousands		9 Months Ended			12 Months Ended
		Sep. 30, 2024		Sep. 30, 2023	Dec. 31, 2023
Acquisitions:
Acreage purchases	[1]	$ 37,743			$ 40,067
Development	[1]	444,637			568,484
Gas gathering facilities:
Development	[1]	2,425			3,123
Subtotal	[1]	517,996			638,204
Asset retirement obligations		2,912	[1]	$ 2,377	4,616	[1]
Total costs incurred	[1]	520,908			642,820
Exploration Expense
Exploration:
Drilling	[1]	14,680			0
Expense	[1]	17,506			25,280
Stock-based compensation expense	[1]	$ 1,005			$ 1,250

[1] (a) Includes costs incurred whether capitalized or expensed.