Supplemental Oil and Gas Information (Unaudited) - Schedule of Net Reserves (Detail)	4 Months Ended	8 Months Ended	12 Months Ended
	May 04, 2017 MBoe bbl MMcf	Dec. 31, 2017 MBoe MMBoe bbl MMcf	Dec. 31, 2019 MBoe bbl MMcf	Dec. 31, 2018 MBoe MMBoe bbl MMcf
Supplemental Oil And Gas Reserve Information [Line Items]
Extensions and discoveries | MMBoe		1.2		1.9
Proved Reserves, Total
Supplemental Oil And Gas Reserve Information [Line Items]
Proved developed and undeveloped reserves, Beginning of year | MBoe		181,444	140,189	164,953
Extensions and discoveries | MBoe		1,199	441	1,923
Purchase of minerals in place | MBoe			69,697
Production | MBoe		(7,142)	(9,256)	(9,694)
Sale of minerals in place | MBoe				(11,016)
Revision of previous estimates | MBoe		(10,548)	(38,069)	(5,977)
Proved developed and undeveloped reserves, End of year | MBoe	181,444	164,953	163,002	140,189
Proved developed reserves, Beginning of year | MBoe		129,283	110,156	117,910
Proved developed reserves, End of year | MBoe	129,283	117,910	130,577	110,156
Proved undeveloped reserves, Beginning of year | MBoe		52,161	30,033	47,043
Proved undeveloped reserves, End of year | MBoe	52,161	47,043	32,425	30,033
Proved Reserves, Total | Predecessor [Member]
Supplemental Oil And Gas Reserve Information [Line Items]
Proved developed and undeveloped reserves, Beginning of year | MBoe	152,761	181,444
Extensions and discoveries | MBoe	69
Production | MBoe	(3,890)
Revision of previous estimates | MBoe	32,504
Proved developed and undeveloped reserves, End of year | MBoe	181,444
Proved developed reserves, Beginning of year | MBoe	111,132	129,283
Proved developed reserves, End of year | MBoe	129,283
Proved undeveloped reserves, Beginning of year | MBoe	41,630	52,161
Proved undeveloped reserves, End of year | MBoe	52,161
Oil [Member]
Supplemental Oil And Gas Reserve Information [Line Items]
Proved developed and undeveloped reserves, Beginning of year		80,960	69,624	72,004
Extensions and discoveries		121	301	1,207
Purchase of minerals in place			17,429
Production		(2,380)	(3,498)	(3,335)
Revision of previous estimates		(6,697)	(13,084)	(93)
Proved developed and undeveloped reserves, End of year	80,960	72,004	70,772	69,624
Proved developed reserves, Beginning of year		57,803	54,147	50,014
Proved developed reserves, End of year	57,803	50,014	53,476	54,147
Proved undeveloped reserves, Beginning of year		23,157	15,477	21,990
Proved undeveloped reserves, End of year	23,157	21,990	17,296	15,477
Sale of minerals in place				(159)
Oil [Member] | Predecessor [Member]
Supplemental Oil And Gas Reserve Information [Line Items]
Proved developed and undeveloped reserves, Beginning of year	65,741	80,960
Extensions and discoveries	53
Production	(1,204)
Revision of previous estimates	16,370
Proved developed and undeveloped reserves, End of year	80,960
Proved developed reserves, Beginning of year	45,536	57,803
Proved developed reserves, End of year	57,803
Proved undeveloped reserves, Beginning of year	20,205	23,157
Proved undeveloped reserves, End of year	23,157
Natural Gas [Member]
Supplemental Oil And Gas Reserve Information [Line Items]
Proved developed and undeveloped reserves, Beginning of year | MMcf		419,472	293,959	406,558
Extensions and discoveries | MMcf		4,900	576	2,910
Purchase of minerals in place | MMcf			202,409
Production | MMcf		(21,885)	(26,489)	(29,176)
Revision of previous estimates | MMcf		4,071	(92,586)	(30,005)
Proved developed and undeveloped reserves, End of year | MMcf	419,472	406,558	377,869	293,959
Proved developed reserves, Beginning of year | MMcf		297,101	232,110	299,481
Proved developed reserves, End of year | MMcf	297,101	299,481	320,731	232,110
Proved undeveloped reserves, Beginning of year | MMcf		122,371	61,849	107,077
Proved undeveloped reserves, End of year | MMcf	122,371	107,077	57,138	61,849
Sale of minerals in place | MMcf				(56,328)
Natural Gas [Member] | Predecessor [Member]
Supplemental Oil And Gas Reserve Information [Line Items]
Proved developed and undeveloped reserves, Beginning of year | MMcf	371,016	419,472
Extensions and discoveries | MMcf	45
Production | MMcf	(12,411)
Revision of previous estimates | MMcf	60,822
Proved developed and undeveloped reserves, End of year | MMcf	419,472
Proved developed reserves, Beginning of year | MMcf	280,035	297,101
Proved developed reserves, End of year | MMcf	297,101
Proved undeveloped reserves, Beginning of year | MMcf	90,981	122,371
Proved undeveloped reserves, End of year | MMcf	122,371
NGLs [Member]
Supplemental Oil And Gas Reserve Information [Line Items]
Proved developed and undeveloped reserves, Beginning of year		30,572	21,572	25,189
Extensions and discoveries		261	44	231
Purchase of minerals in place			18,533
Production		(1,114)	(1,343)	(1,496)
Revision of previous estimates		(4,530)	(9,554)	(883)
Proved developed and undeveloped reserves, End of year	30,572	25,189	29,252	21,572
Proved developed reserves, Beginning of year		21,963	17,324	17,982
Proved developed reserves, End of year	21,963	17,982	23,646	17,324
Proved undeveloped reserves, Beginning of year		8,609	4,248	7,207
Proved undeveloped reserves, End of year	8,609	7,207	5,606	4,248
Sale of minerals in place				(1,469)
NGLs [Member] | Predecessor [Member]
Supplemental Oil And Gas Reserve Information [Line Items]
Proved developed and undeveloped reserves, Beginning of year	25,184	30,572
Extensions and discoveries	8
Production	(616)
Revision of previous estimates	5,996
Proved developed and undeveloped reserves, End of year	30,572
Proved developed reserves, Beginning of year	18,923	21,963
Proved developed reserves, End of year	21,963
Proved undeveloped reserves, Beginning of year	6,261	8,609
Proved undeveloped reserves, End of year	8,609