Summary of Significant Accounting Policies - Summary of Changes in Reserve for Future Abandonment Costs (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Asset Retirement Obligations Noncurrent [Abstract]
Future abandonment costs — beginning of period	$ 5,136
Accretion expense	96
New wells placed on production	40
Liabilities settled and assets disposed of	(29)
Future abandonment costs — end of period	$ 5,243
Predecessor
Asset Retirement Obligations Noncurrent [Abstract]
Future abandonment costs — beginning of period		$ 10,407
Accretion expense		140
New wells placed on production		2
Liabilities settled and assets disposed of		(60)
Future abandonment costs — end of period		$ 10,489