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Long-Term Debt - Additional Information (Detail) |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
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May 29, 2018 USD ($) | May 14, 2018 USD ($) | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2018 USD ($) day $ / shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Nov. 19, 2018 USD ($) | Oct. 16, 2018 USD ($) | Aug. 27, 2018 USD ($) | Jun. 30, 2018 USD ($) | May 25, 2018 USD ($) | Apr. 19, 2018 USD ($) | Feb. 26, 2018 USD ($) | Apr. 10, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 2,735,276,000 | $ 2,735,276,000 | $ 2,097,606,000 |  |  |  |  |  |  |  |  |
Total long-term debt |  |  | 2,735,276,000 | 2,735,276,000 | 2,097,606,000 |  |  |  |  |  |  |  |  |
Less: unamortized deferred financing costs on senior unsecured notes |  |  | $ 31,200,000 | $ 31,200,000 |  |  |  |  |  |  |  |  |  |
Minimum reserve value of oil and natural gas properties (percent) |  |  | 90.00% | 90.00% |  |  |  |  |  |  |  |  |  |
Aggregate cost of debt repurchased |  |  |  | $ 423,340,000 | 0 | $ 435,907,000 |  |  |  |  |  |  |  |
Gain (loss) on debt repurchase |  |  |  | (13,848,000) | 0 | 4,741,000 |  |  |  |  |  |  |  |
Write off of deferred finance costs |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |  |
Amortization of deferred financing costs |  |  |  | 7,600,000 | 7,000,000 | 9,800,000 |  |  |  |  |  |  |  |
Senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: unamortized deferred financing costs on senior unsecured notes |  |  | $ 20,865,000 | 20,865,000 | 22,956,000 |  |  |  |  |  |  |  |  |
Total principal of senior unsecured notes |  |  | 2,039,409,000 | 2,039,409,000 | $ 2,052,950,000 |  |  |  |  |  |  |  |  |
Face amount of repurchased debt |  |  |  |  |  |  |  |  |  |  | $ 390,600,000 |  |  |
Debt repurchased |  |  |  |  |  |  |  |  |  |  | $ 402,000,000 |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, weighted average interest rate |  |  |  |  | 3.10% |  |  |  |  |  |  |  |  |
Line of credit | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  | $ 14,000,000 | $ 14,000,000 | $ 10,500,000 |  |  |  |  |  |  |  |  |
Line of credit | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit sublimit |  |  |  |  |  |  |  | $ 1,600,000,000 |  |  |  | $ 1,600,000,000 |  |
Line of credit facility, capacity available for specific purpose other than for trade purchases |  |  |  |  |  |  |  | 3,000,000,000 |  |  |  | 2,500,000,000 |  |
Current borrowing base |  |  |  |  |  |  |  | $ 1,350,000,000 |  |  |  | $ 1,350,000,000 | $ 1,350,000,000 | $ 1,150,000,000
Debt, weighted average interest rate |  |  | 4.20% | 4.20% | 3.20% |  |  |  |  |  |  |  |  |
Write off of deferred finance costs |  |  |  | $ 289,410.602981102 | $ 1,800,000 |  |  |  |  |  |  |  |  |
Unsecured Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fair value |  |  | $ 1,830,400,000 | 1,830,400,000 |  |  |  |  |  |  |  |  |  |
Unsecured Senior Notes | Senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt |  |  | 2,039,400,000 | 2,039,400,000 |  |  |  |  |  |  |  |  |  |
7.25% senior unsecured notes due February 1, 2019 | Senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal of senior unsecured notes |  |  | 0 | 0 | 54,275,000 |  |  |  |  |  |  |  |  |
Senior unsecured notes stated interest rate (percent) |  |  |  |  |  |  |  |  |  |  | 7.25% |  |  |
Senior unsecured debt principal amount |  |  |  |  |  |  |  |  |  |  | $ 31,300,000 |  |  |
Aggregate cost of debt repurchased | $ 23,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt redemption price (percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
6.50% senior unsecured notes due November 1, 2021 | Senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal of senior unsecured notes |  |  | 71,835,000 | 71,835,000 | 395,501,000 |  |  |  |  |  |  |  |  |
Senior unsecured notes stated interest rate (percent) |  |  |  |  |  |  |  |  |  |  | 6.50% |  |  |
Senior unsecured debt principal amount |  |  |  |  |  |  |  |  |  |  | $ 323,700,000 |  |  |
Amended credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of credit unused borrowing base capacity |  |  | 868,000,000 | $ 868,000,000 | 1,069,500,000 |  |  |  |  |  |  |  |  |
Amended credit facility | Current ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum current ratio |  |  |  | 1.0 |  |  |  |  |  |  |  |  |  |
Aggregate elected commitment threshold |  |  | 0.85 | $ 0.85 |  |  |  |  |  |  |  |  |  |
Amended credit facility | Minimum | EBITDAX |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum debt to EBITDAX ratio |  |  |  | 2.5 |  |  |  |  |  |  |  |  |  |
The Credit Agreement | Bridge Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit sublimit |  |  | 10,000,000 | $ 10,000,000 |  |  |  |  |  |  |  |  |  |
OMP Credit Facility | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: unamortized deferred financing costs on senior unsecured notes |  |  | 2,400,000 | 2,400,000 |  |  |  |  |  |  |  |  |  |
OMP Credit Facility | Line of credit | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal of senior unsecured notes |  |  | 318,000,000 | 318,000,000 | 78,000,000 |  |  |  |  |  |  |  |  |
Unused borrowing capacity |  |  | 82,000,000 | 82,000,000 |  |  |  |  |  |  |  |  |  |
Line of credit sublimit |  |  |  |  |  |  | $ 400,000,000 |  | $ 250,000,000 | $ 200,000,000 |  |  |  |
Notes | Senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes outstanding |  |  | $ 1,739,400,000 | $ 1,739,400,000 |  |  |  |  |  |  |  |  |  |
Notes | Senior unsecured notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes stated interest rate (percent) |  |  | 6.25% | 6.25% |  |  |  |  |  |  |  |  |  |
Notes | Senior unsecured notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes stated interest rate (percent) |  |  | 6.875% | 6.875% |  |  |  |  |  |  |  |  |  |
2026 Notes | Senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes stated interest rate (percent) |  | 6.25% |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured debt principal amount |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt issuance |  | $ 394,400,000 |  |  |  |  |  |  |  |  |  |  |  |
6.875% senior unsecured notes due March 15, 2022 | Senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal of senior unsecured notes |  |  | $ 901,480,000 | $ 901,480,000 | 937,080,000 |  |  |  |  |  |  |  |  |
Senior unsecured notes stated interest rate (percent) |  |  |  |  |  |  |  |  |  |  | 6.875% |  |  |
Senior unsecured debt principal amount |  |  |  |  |  |  |  |  |  |  | $ 35,600,000 |  |  |
6.875% senior unsecured notes and 2.625% senior unsecured notes | Senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal of senior unsecured notes |  |  | 666,100,000 | 666,100,000 |  |  |  |  |  |  |  |  |  |
6.25% senior unsecured notes due May 1, 2026 | Senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal of senior unsecured notes |  |  | 400,000,000 | 400,000,000 |  |  |  |  |  |  |  |  |  |
2022 Notes and 2023 Notes | Senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal of senior unsecured notes |  |  | 1,267,600,000 | 1,267,600,000 |  |  |  |  |  |  |  |  |  |
6.875% senior unsecured notes due January 15, 2023 | Senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal of senior unsecured notes |  |  | 366,094,000 | 366,094,000 | 366,094,000 |  |  |  |  |  |  |  |  |
2.625% senior unsecured convertible notes due September 15, 2023 | Senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt discount at inception |  |  | 69,268,000 | 69,268,000 | 80,388,000 |  |  |  |  |  |  |  |  |
Total principal of senior unsecured notes |  |  | $ 300,000,000 | $ 300,000,000 | 300,000,000 |  |  |  |  |  |  |  |  |
Senior unsecured notes stated interest rate (percent) |  |  | 2.625% | 2.625% |  |  |  |  |  |  |  |  |  |
Senior unsecured debt principal amount |  |  | $ 300,000,000 | $ 300,000,000 |  |  |  |  |  |  |  |  |  |
Initial conversion rate (shares per $1000 principal) |  |  |  | 76.365 |  |  |  |  |  |  |  |  |  |
Debt conversion rate (in usd per share) | $ / shares |  |  | $ 13.10 | $ 13.10 |  |  |  |  |  |  |  |  |  |
Oasis Credit Facility | Line of credit | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal of senior unsecured notes |  |  | $ 468,000,000 | $ 468,000,000 | 70,000,000 |  |  |  |  |  |  |  |  |
Debt, weighted average interest rate |  |  | 4.20% | 4.20% |  |  |  |  |  |  |  |  |  |
Oasis Credit Facility | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: unamortized deferred financing costs on senior unsecured notes |  |  | $ 7,900,000 | $ 7,900,000 |  |  |  |  |  |  |  |  |  |
Gain on Extinguishment of Debt | Purchased Notes | Senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of deferred finance costs |  |  |  |  | $ 0 | $ 6,400,000 |  |  |  |  |  |  |  |
Debt Conversion Scenario 1 | Amended credit facility | Current ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
EBITDAX ratio |  |  |  | 4.25 |  |  |  |  |  |  |  |  |  |
Debt Conversion Scenario 1 | 2.625% senior unsecured convertible notes due September 15, 2023 | Senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | day |  |  |  | 20 |  |  |  |  |  |  |  |  |  |
Number of consecutive trading days | day |  |  |  | 30 |  |  |  |  |  |  |  |  |  |
Conversion price, percentage of stock price trigger (percent) |  |  |  | 130.00% |  |  |  |  |  |  |  |  |  |
Debt Conversion Scenario 2 | Amended credit facility | Current ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
EBITDAX ratio |  |  |  | 4.0 |  |  |  |  |  |  |  |  |  |
Debt Conversion Scenario 2 | 2.625% senior unsecured convertible notes due September 15, 2023 | Senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | day |  |  |  | 5 |  |  |  |  |  |  |  |  |  |
Number of consecutive trading days | day |  |  |  | 5 |  |  |  |  |  |  |  |  |  |
Percentage of stock price to product of stock sale price and conversion rate (percent) |  |  |  | 98.00% |  |  |  |  |  |  |  |  |  |
LIBOR | Revolving credit facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan term |  |  |  | 1 month |  |  |  |  |  |  |  |  |  |
Commitment fee of borrowing base capacity not utilized, percentage |  |  | 0.375% |  |  |  |  |  |  |  |  |  |  |
LIBOR | Revolving credit facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan term |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |
Commitment fee of borrowing base capacity not utilized, percentage |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |
OMP Operating, LLC | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit sublimit |  |  | $ 10,000,000 | $ 10,000,000 |  |  |  |  |  |  |  |  |  |
OMP Operating, LLC | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, sublimit increase allowed subject to certain conditions |  |  |  |  |  |  | $ 600,000,000 |  |  |  |  |  |  |
OMP Operating, LLC | Federal Funds Effective Swap Rate | ABR Loans | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin on variable rate (percent) |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |
OMP Operating, LLC | Federal Funds Effective Swap Rate | ABR Loans or Swingline Loans | Revolving credit facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin on variable rate (percent) |  |  |  | 0.75% |  |  |  |  |  |  |  |  |  |
OMP Operating, LLC | Federal Funds Effective Swap Rate | ABR Loans or Swingline Loans | Revolving credit facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin on variable rate (percent) |  |  |  | 1.75% |  |  |  |  |  |  |  |  |  |
OMP Operating, LLC | LIBOR | ABR Loans | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin on variable rate (percent) |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |

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- Definition Debt Instrument, Convertible, Threshold Percentage of Stock Price to Product of Stock Sale Price and Conversion Rate + References No definition available. + Details
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- Definition The minimum current ratio as required by the entity's debt agreement. + References No definition available. + Details
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- Definition The minimum ratio of consolidated EBITDAX to consolidated Interest Expense as required by the entity's debt agreement. + References No definition available. + Details
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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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