Supplemental Crude Oil and Natural Gas Information - Changes in Standardized Measure of Discounted Future Net Cash Flows (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward]
Standardized measure of discounted future net cash flows at beginning of year	$ 15,684,817	$ 10,470,177	$ 5,510,223
Extensions, discoveries and improved recoveries, less related costs	1,649,322	5,162,635	1,462,629
Revisions of previous quantity estimates	(1,564,503)	(3,522,428)	(1,004,355)
Changes in estimated future development and abandonment costs	1,401,513	1,063,089	743,657
Increase Due to Purchases of Minerals in Place	49,330
Sales of Minerals in Place		(9,192)	(41,077)
Net change in prices and production costs	(6,591,347)	4,224,473	3,808,116
Accretion of discount	1,865,034	1,183,347	665,507
Sales of crude oil and natural gas produced, net of production costs	(3,486,103)	(3,743,572)	(2,450,474)
Development costs incurred during the period	1,557,121	1,134,153	1,045,875
Change in timing of estimated future production and other	(1,690,779)	1,324,365	948,519
Change in income taxes	1,587,236	(1,602,230)	(218,443)
Net change	(5,223,176)	5,214,640	4,959,954
Standardized measure of discounted future net cash flows at end of year	$ 10,461,641	$ 15,684,817	$ 10,470,177