Summary of Significant Accounting Policies - Summary of Lease Cost Recognized (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Operations And Summary Of Significant Accounting Policies [Line Items]
Operating lease cost	$ 8,208	$ 20,457
General and Administrative Expense
Operations And Summary Of Significant Accounting Policies [Line Items]
Operating lease cost	416	827
Lease Operating Expense
Operations And Summary Of Significant Accounting Policies [Line Items]
Operating lease cost	212	349
Short-term Drilling Rig Costs Included in Proved Oil and Gas Properties
Operations And Summary Of Significant Accounting Policies [Line Items]
Operating lease cost	$ 7,580	$ 19,281