Revenue - Summary of Revenues Disaggregated (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Total revenues	$ 52,745	$ 72,959	$ 146,052	$ 197,646
Oil and Natural Gas Sales [Member]
Revenues:
Total revenues	52,488	72,426	145,163	196,978
Oil [Member]
Revenues:
Total revenues	36,868	55,011	101,682	136,754
NGLs [Member]
Revenues:
Total revenues	5,537	4,306	14,002	15,509
Natural Gas [Member]
Revenues:
Total revenues	$ 10,083	$ 13,109	$ 29,479	$ 44,715