Assets Held for Sale and Discontinued Operations - Summary of Assets and Liabilities Held for Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total current assets held for sale	$ 1,115	$ 1,047
Total noncurrent assets held for sale	3,430	9,665
Accrued liabilities			$ 3,500
Total current liabilities associated with assets held for sale	4,052	2,815
Total noncurrent liabilities associated with assets held for sale	6,978	7,013
Assets Held for Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable	810	343
Other current assets	305	704
Total current assets held for sale	1,115	1,047
Proved oil and gas properties, net	3,351	9,528
Other noncurrent assets	79	137
Total noncurrent assets held for sale	3,430	9,665
Accounts payable	1,848	2,067
Accrued liabilities	2,145	570
Other current liabilities	59	178
Total current liabilities associated with assets held for sale	4,052	2,815
Asset retirement obligations	6,973	6,488
Other liabilities	5	525
Total noncurrent liabilities associated with assets held for sale	$ 6,978	$ 7,013