Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Total property and equipment	$ 8,551,419	$ 8,803,668
Less accumulated depreciation, depletion and impairment	(5,244,742)	(4,801,119)
Property and equipment, net	3,306,677	4,002,549
Equipment
Property Plant And Equipment [Line Items]
Total property and equipment	8,114,326	8,370,933
Oil and natural gas properties
Property Plant And Equipment [Line Items]
Total property and equipment	226,646	219,855
Buildings
Property Plant And Equipment [Line Items]
Total property and equipment	184,700	186,736
Land
Property Plant And Equipment [Line Items]
Total property and equipment	$ 25,747	$ 26,144