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Oil and Gas Reserves Information (Unaudited) - Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Reserves (Detail) - USD ($) $ in Thousands | 5 Months Ended | 7 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Aug. 13, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017
Cash Flows Relating to Proved Reserves: |  |  |  |  |
Future Cash Flows | $ 8,054,092 |  | $ 9,871,616 | $ 13,078,155 |
Future Costs: |  |  |  |  |
Production | (2,160,912) |  | (3,173,350) | (3,562,042) |
Development and Abandonment | (1,800,335) |  | (2,592,520) | (3,171,351) |
Future Income Taxes | (622,241) |  | (154,872) | (676,759) |
Future Net Cash Flows | $ 3,470,604 |  | $ 3,950,874 | $ 5,668,003 |
Percentage of discount factor | 10.00% | 10.00% | 10.00% | 10.00% |
10% Discount Factor | $ (1,996,764) |  | $ (2,015,149) | $ (2,754,792) |
Standardized Measure of Discounted Future Net Cash Flows | $ 1,473,840 | $ 1,317,383 | $ 1,935,725 | $ 2,913,211 |
Predecessor |  |  |  |  |
Cash Flows Relating to Proved Reserves: |  |  |  |  |
Future Cash Flows |  | 6,384,203 |  |  |
Future Costs: |  |  |  |  |
Production |  | (1,804,559) |  |  |
Development and Abandonment |  | (1,945,141) |  |  |
Future Income Taxes |  | (199,589) |  |  |
Future Net Cash Flows |  | 2,434,914 |  |  |
10% Discount Factor |  | (1,556,927) |  |  |
Standardized Measure of Discounted Future Net Cash Flows |  | $ 877,987 |  |  | $ 881,544

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- Definition Amount of estimated future accumulated cash inflow from the sale of proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 31 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62455-109447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62479-109447 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63094-109448 + Details
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