Supplemental Disclosures to the Unaudited Condensed Consolidated Balance Sheets and Unaudited Condensed Consolidated Statements of Cash Flows - Summary of Supplemental Cash Flows (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Supplemental cash flows:
Cash paid for interest, net of amounts capitalized	$ 7,921	$ 12,477
Cash paid for reorganization items, net	532	684
Cash paid for taxes	85	0
Noncash investing and financing activities:
Change in capital expenditures in payables and accrued liabilities	(4,016)	324
Assets acquired & liabilities assumed in the Merger:
Accounts receivable	0	14,633
Prepaids and other current assets	0	3,229
Other non-current assets	0	9,879
Oil and natural gas properties	0	142,642
Other property and equipment	0	6,280
Accounts payable and other current liabilities	0	(24,135)
Other non-current liabilities	0	(5,067)
Long-term debt	0	(76,559)
Issuance of common stock in connection with the Merger	$ 0	$ 90,150