Revenue - Summary of Revenues Disaggregated (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Total revenues	$ 35,171	$ 59,532	$ 93,307	$ 124,687
Oil and Natural Gas Sales [Member]
Revenues:
Total revenues	34,888	59,485	92,675	124,552
Oil [Member]
Revenues:
Total revenues	22,963	41,685	64,814	81,742
NGLs [Member]
Revenues:
Total revenues	3,343	5,336	8,465	11,201
Natural Gas [Member]
Revenues:
Total revenues	$ 8,582	$ 12,464	$ 19,396	$ 31,609