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, 2019	Sep. 30, 2018
Supplemental cash flows:
Cash paid for interest, net of amounts capitalized	$ 12,477	$ 15,405
Cash paid for reorganization items, net	684	2,004
Noncash investing and financing activities:
Increase (decrease) in capital expenditures in payables and accrued liabilities	324	(565)
Assets acquired & liabilities assumed in the Merger:
Accounts receivable	14,633	0
Prepaids and other current assets	3,229	0
Other non-current assets	9,879	0
Oil and natural gas properties	142,642	0
Other property and equipment	6,280	0
Accounts payable and accrued liabilities	(24,135)	0
Other non-current liabilities	(5,067)	0
Long-term debt	(76,559)	0
Issuance of common stock in connection with the Merger	$ 90,150	$ 0