Summary of Significant Accounting Policies - Supplementary Information of Consolidated Statements of Cash Flows (Detail) - USD ($) $ in Thousands	2 Months Ended	7 Months Ended	9 Months Ended
	Sep. 30, 2018	Aug. 13, 2018	Sep. 30, 2019
Cash payments for:
Interest	$ 1,999		$ 110,820
Income taxes			2
Non-cash investing activities include:
Increase in accrued capital expenditures	$ 16,192		46,918
Non-cash investing activities related to the Covey Park Acquisition include:
Debt assumed in merger			446,625
Acquired working capital			41,624
Common Stock
Non-cash investing activities related to the Covey Park Acquisition include:
Issuance of stock			167,808
Predecessor
Cash payments for:
Interest		$ 36,187
Income taxes		2
Non-cash investing activities include:
Increase in accrued capital expenditures		$ 12,937
Series A 10% Convertible Preferred Stock
Non-cash investing activities related to the Covey Park Acquisition include:
Issuance of stock			$ 200,000