Supplemental Disclosures to the Consolidated Balance Sheet and Condensed Statement of Cash Flows - Summary of Supplemental Cash Flows (Detail) - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	May 04, 2017	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Supplemental cash flows:
Cash paid for interest, net of amounts capitalized		$ 12,109	$ 15,937	$ 17,083
Cash paid for reorganization items, net		7,943	1,057	2,399
Noncash investing and financing activities:
Increase (decrease) in capital expenditures in payables and accrued liabilities		(1,080)	2,143	(156)
Asset retirement obligation removal related to divestitures		0	0	(15,702)
Assumption of asset retirement obligations related to Merger		0	9,440	0
Assets acquired & liabilities assumed in the Merger:
Accounts receivable		0	14,633	0
Prepaids and other current assets		0	3,229	0
Other non-current assets		0	9,075	0
Oil and natural gas properties		0	149,421	0
Other property and equipment		0	1,694	0
Accounts payable and other current liabilities		0	(24,135)	0
Other non-current liabilities		0	(5,067)	0
Long-term debt		0	(76,559)	0
Issuance of common stock in connection with the Merger		$ 0	$ 91,541	$ 0
Predecessor [Member]
Supplemental cash flows:
Cash paid for interest, net of amounts capitalized	$ 6,598
Cash paid for reorganization items, net	11,999
Noncash investing and financing activities:
Increase (decrease) in capital expenditures in payables and accrued liabilities	3,173
Asset retirement obligation removal related to divestitures	0
Assumption of asset retirement obligations related to Merger	0
Assets acquired & liabilities assumed in the Merger:
Accounts receivable	0
Prepaids and other current assets	0
Other non-current assets	0
Oil and natural gas properties	0
Other property and equipment	0
Accounts payable and other current liabilities	0
Other non-current liabilities	0
Long-term debt	0
Issuance of common stock in connection with the Merger	$ 0