Costs Incurred for Property Acquisition, Exploration and Development (Detail) - USD ($) $ in Thousands		3 Months Ended			12 Months Ended
		Mar. 31, 2022		Mar. 31, 2021	Dec. 31, 2021
Acquisitions:
Acreage purchases	[1]	$ 8,574			$ 21,942
Development	[1]	107,987			381,753
Gas gathering facilities:
Development	[1]	7			3,402
Subtotal	[1]	121,267			436,981
Asset retirement obligations		1,377	[1]	$ 761	18,634	[1]
Total costs incurred	[1]	122,644			455,615
Exploration Expense
Exploration:
Drilling	[1]	0			6,329
Expense	[1]	4,247			22,048
Stock-based compensation expense	[1]	$ 452			$ 1,507

[1] Includes costs incurred whether capitalized or expensed.