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Summary of Significant Accounting Policies - Narrative (Detail) |  |  |  |  | 5 Months Ended | 7 Months Ended | 12 Months Ended |
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May 19, 2020 USD ($) shares | Nov. 01, 2019 USD ($) $ / shares shares | Jul. 16, 2019 USD ($) $ / shares shares | Jul. 16, 2019 USD ($) $ / shares $ / bbl $ / Mcf | Aug. 14, 2018 USD ($) shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) customer | Aug. 13, 2018 USD ($) customer | Dec. 31, 2020 USD ($) product customer segment $ / shares shares | Dec. 31, 2019 USD ($) customer shares | Dec. 31, 2018 USD ($) | Sep. 30, 2020 USD ($)
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Jones contribution transaction, Shares issued | shares |  |  |  |  | 88,571,429 |  |  |  |  |  |  |
Jones contribution transaction, ownership percentage |  |  |  |  | 84.00% |  |  |  |  |  |  |
Assumed 7½% senior notes |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 446,625,000 |  |
Repayments of outstanding borrowings |  |  |  |  |  |  | 1,291,352,000 | 49,679,000 | 907,000,000 | 127,000,000 |  |
Value of common stock shares issued |  |  |  |  |  | $ 95,003,000 |  |  | 116,206,000 | 95,003,000 |  |
Acquisition related fees |  |  |  |  |  |  | 0 | 2,866,000 | 0 | 41,010,000 |  |
Management's oil price outlook | $ / bbl |  |  |  | 74.80 |  |  |  |  |  |  |  |
Management's gas price outlook | $ / Mcf |  |  |  | 3.32 |  |  |  |  |  |  |  |
Annual minimum discount rate |  |  |  | 10.00% |  |  |  |  |  |  |  |
Annual maximum discount rate |  |  |  | 25.00% |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  | 223,621,000 | 166,630,000 | 858,195,000 | 768,689,000 |  |
Operating income |  |  |  |  |  |  | 116,031,000 | 10,822,000 | 163,032,000 | 274,886,000 |  |
Allowance for doubtful accounts |  |  |  |  |  |  |  |  | 0 |  |  |
Goodwill |  |  |  |  |  | 335,897,000 |  |  | 335,897,000 | 335,897,000 |  |
Operating lease right-of-use assets |  |  |  |  |  | $ 3,509,000 |  |  | 3,025,000 | 3,509,000 |  |
Cash payments for operating leases associated with right-of-use assets |  |  |  |  |  |  |  |  | $ 2,500,000 | $ 2,000,000.0 |  |
Operating lease, weighted average remaining term |  |  |  |  |  | 1 year 11 months 15 days |  |  | 1 year 6 months 14 days | 1 year 11 months 15 days |  |
Discount rate |  |  |  |  |  | 5.00% |  |  | 4.30% | 5.00% |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 1 |  |  |
Number of primary products | product |  |  |  |  |  |  |  |  | 2 |  |  |
Contract cash settlement max days |  |  |  |  |  |  |  |  | 25 days |  |  |
Contract cancellable notice term |  |  |  |  |  |  |  |  | 30 days |  |  |
Oil and gas sales |  |  |  |  |  | $ 120,111,000 |  |  | $ 125,016,000 | $ 120,111,000 |  |
Reimbursements of overhead costs |  |  |  |  |  |  | 4,500,000 | 8,500,000 | $ 24,700,000 | 16,800,000 |  |
Performance multiplier, minimum |  |  |  |  |  |  |  |  | 0.00% |  |  |
Performance multiplier, maximum |  |  |  |  |  |  |  |  | 200.00% |  |  |
Warrants for common stock exercise price | $ / shares |  |  |  |  |  |  |  |  | $ 0.01 |  |  |
Conversion price per share (in dollars per share) | $ / shares |  |  | $ 4.00 |  |  |  |  |  | $ 4.00 |  |  |
Interest paid in-kind |  |  |  |  |  |  | $ 0 | 25,004,000 | $ 0 | $ 0 |  |
Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest paid in-kind |  |  |  |  |  |  |  | $ 25,000,000.0 |  |  |  |
Major Oil and Natural Gas Purchaser |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of major customer of oil and gas sales | customer |  |  |  |  |  |  | 2 | 3 | 4 | 3 |  |
Major Oil and Natural Gas Purchaser One |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage accounted of oil and gas sales |  |  |  |  |  |  | 32.00% | 33.00% | 19.00% | 19.00% |  |
Major Oil and Natural Gas Purchaser Two |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage accounted of oil and gas sales |  |  |  |  |  |  | 18.00% | 22.00% | 15.00% | 16.00% |  |
Major Oil and Natural Gas Purchaser Three |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage accounted of oil and gas sales |  |  |  |  |  |  |  | 20.00% | 15.00% | 12.00% |  |
Major Oil and Natural Gas Purchaser Four |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage accounted of oil and gas sales |  |  |  |  |  |  |  |  | 10.00% |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment estimated useful lives |  |  |  |  |  |  |  |  | 3 years |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment estimated useful lives |  |  |  |  |  |  |  |  | 31 years 6 months |  |  |
Haynesville Shale |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Merger value |  | $ 42,300,000 |  |  |  |  |  |  |  |  |  |
Pro Forma |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related fees |  |  |  |  |  |  |  |  |  | $ 41,000,000.0 | $ 41,000,000.0 |
Operating revenues |  |  |  |  |  |  |  |  |  | $ 1,147,290,000 | $ 1,168,585,000 |
Common Stock | Haynesville Shale |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share issue price | $ / shares |  | $ 6.85 |  |  |  |  |  |  |  |  |  |
Shares issued as consideration | shares |  | 4,500,000 |  |  |  |  |  |  |  |  |  |
Common Stock | Affiliates Controlled By Majority Shareholder Jerry Jones |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) | shares |  |  | 50,000,000 |  |  |  |  |  |  |  |  |
Value of common stock shares issued |  |  | $ 300,000,000.0 | $ 300,000,000.0 |  |  |  |  |  |  |  |
Convertible Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption value of convertible preferred stock issued |  |  |  |  |  |  |  |  | $ 210,000,000.0 |  |  |
Fair value of preferred stock |  |  |  |  |  |  |  |  | 200,000,000.0 |  |  |
Series B Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock issued/ sold (in shares) | shares |  |  | 175,000 |  |  |  |  |  |  |  |  |
Series B 10% Convertible Preferred Stock | Affiliates Controlled By Majority Shareholder Jerry Jones |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption value of convertible preferred stock issued |  |  | $ 175,000,000.0 |  |  |  |  |  |  |  |  |
Convertible preferred stock issued/ sold (in shares) | shares |  |  | 175,000 |  |  |  |  |  |  |  |  |
Series A 10% Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption value of convertible preferred stock issued |  |  | $ 210,000,000.0 |  |  |  |  |  |  |  |  |
Convertible preferred stock issued/ sold (in shares) | shares |  |  | 210,000 |  |  |  |  |  |  |  |  |
Fair value of preferred stock |  |  | $ 200,000,000.0 | 200,000,000.0 |  |  |  |  |  |  |  |
Redemption of outstanding shares | shares | 210,000 |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of redemption requirement | $ 210,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Accrued and unpaid dividends | $ 2,900,000 |  |  |  |  |  |  |  |  |  |  |
Covey Park Equity Owners |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash received by equity owners of acquire |  |  | 700,000,000 |  |  |  |  |  |  |  |  |
Repayments of outstanding borrowings |  |  | 380,000,000.0 |  |  |  |  |  |  |  |  |
Preferred equity redeemed in merger |  |  | 153,400,000 | 153,400,000 |  |  |  |  |  |  |  |
Merger value |  |  | 2,226,682,000 | 2,226,682,000 |  |  |  |  |  |  |  | $ 2,225,608,000
Acquisition related fees |  |  |  |  |  |  |  |  | $ 41,000,000.0 |  |  |
Fair value of asset retirement obligations |  |  | $ 5,374,000 | $ 5,374,000 |  |  |  |  |  |  |  | $ 5,374,000
Operating revenues |  |  |  |  |  | 264,400,000 |  |  |  |  |  |
Operating income |  |  |  |  |  | $ 93,000,000.0 |  |  |  |  |  |
Covey Park Equity Owners | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) | shares |  |  | 28,833,000 |  |  |  |  |  |  |  |  |
Share issue price | $ / shares |  |  | $ 5.82 | $ 5.82 |  |  |  |  |  |  |  |
Covey Park Equity Owners | Series A and Series B Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate common stock upon conversion | shares |  |  |  |  |  |  |  |  |  | 96,250,000 |  |
Covey Park Equity Owners | Convertible Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption value of convertible preferred stock issued |  |  | $ 210,000,000.0 |  |  |  |  |  |  |  |  |
Interest rate on debt instrument |  |  |  |  |  |  |  |  | 7.50% |  |  |
Aggregate common stock upon conversion | shares |  |  |  |  |  |  |  |  | 52,500,000 |  |  |
Covey Park Equity Owners | Series B Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate common stock upon conversion | shares |  |  |  |  |  |  |  |  | 43,750,000 |  |  |
Covey Park Equity Owners | 7.5% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Assumed 7½% senior notes |  |  | $ 625,000,000.0 |  |  |  |  |  |  |  |  |
Covey Park Equity Owners | 7½% Senior Notes Due 2025 |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt instrument |  |  | 7.50% | 7.50% |  |  |  |  | 7.00% |  |  |
Bakken Shale Properties |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Oil and gas property cost basis |  |  |  |  | $ 397,600,000 |  |  |  |  |  |  |
Oil and gas property capitalized costs |  |  |  |  | 554,300,000 |  |  |  |  |  |  |
Oil and gas property accumulated depletion, depreciation and amortization |  |  |  |  | $ 156,700,000 |  |  |  |  |  |  |
Oil and Gas Properties | Covey Park Equity Owners |  |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of asset retirement obligations |  |  | $ 5,400,000 | $ 5,400,000 |  |  |  |  |  |  |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition Discount rate used by lessee to determine present value of operating lease payments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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- Definition The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599 + Details
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