Supplemental Disclosures to the Consolidated Balance Sheet and Condensed Statement of Cash Flows - Summary of Supplemental Cash Flows (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Supplemental cash flows:
Cash paid for interest, net of amounts capitalized	$ 10,331	$ 15,937
Cash paid for reorganization items, net	566	1,057
Cash paid for taxes	85	0
Noncash investing and financing activities:
Change in capital expenditures in payables and accrued liabilities	(5,343)	2,143
Assumption of asset retirement obligations related to Merger	0	9,440
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	9,075
Oil and natural gas properties	0	149,421
Other property and equipment	0	1,694
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	$ 91,541