Revenue - Summary of Revenues Disaggregated (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues:
Total revenues	$ 72,959	$ 85,522	$ 197,646	$ 264,442
Oil and Natural Gas Sales [Member]
Revenues:
Total revenues	72,426	85,446	196,978	264,187
Oil [Member]
Revenues:
Total revenues	55,011	52,576	136,754	165,843
NGLs [Member]
Revenues:
Total revenues	4,306	12,132	15,509	34,009
Natural Gas [Member]
Revenues:
Total revenues	$ 13,109	$ 20,738	$ 44,715	$ 64,335