Supplemental Oil and Gas Information (Unaudited) - Schedule of Changes in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Reserves (Detail) - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	May 04, 2017	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Supplemental Oil And Gas Reserve Information [Line Items]
Beginning of year		$ 691,089	$ 1,113,029	$ 767,671
Sale of oil and natural gas produced, net of production costs		(100,946)	(113,545)	(181,841)
Purchase of minerals in place		0	408,370	0
Sale of minerals in place		0	0	(29,036)
Extensions and discoveries		7,187	5,334	27,157
Changes in prices and costs		161,106	(623,592)	507,888
Previously estimated development costs incurred		61,851	84,341	73,761
Net changes in future development costs		(31,438)	110,892	24,396
Revisions of previous quantities		(27,060)	(183,300)	(86,812)
Accretion of discount		46,072	92,998	51,769
Change in production rates and other		(40,190)	22,034	(41,924)
End of year	$ 691,089	767,671	$ 916,561	$ 1,113,029
Predecessor [Member]
Supplemental Oil And Gas Reserve Information [Line Items]
Beginning of year	395,841	$ 691,089
Sale of oil and natural gas produced, net of production costs	(57,420)
Purchase of minerals in place	0
Sale of minerals in place	0
Extensions and discoveries	1,320
Changes in prices and costs	306,375
Previously estimated development costs incurred	9,227
Net changes in future development costs	(55,333)
Revisions of previous quantities	99,591
Accretion of discount	13,195
Change in production rates and other	(21,707)
End of year	$ 691,089