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v3.20.1

Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative credit risk valuation adjustment, derivative assets | $ 0.7 |
Derivative credit risk valuation adjustment, derivative liabilities |  | $ 0.5
Inflation factor | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Asset retirement obligation measurement input (percent) | 2.50% |
Oil and gas and other properties, measurement input (percent) | 2.50% |
NYMEX forward price | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Oil and gas and other properties, measurement input (percent) | 2.50% |
Market-based weighted average cost of capital | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Asset retirement obligation measurement input (percent) | 8.40% |
Market-based weighted average cost of capital | Discounted Cash Flow | Proved Oil And Gas Properties |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Oil and gas and other properties, measurement input (percent) | 12.70% |
Market-based weighted average cost of capital | Discounted Cash Flow | Midstream Assets |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Oil and gas and other properties, measurement input (percent) | 10.40% |

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- Definition Asset Retirement Obligation, Measurement Input + References No definition available. + Details
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Namespace Prefix: | oas_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Oil and Gas Properties, Measurement Input + References No definition available. + Details
Name: | oas_OilAndGasPropertiesMeasurementInput
Namespace Prefix: | oas_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of credit risk valuation adjustment to derivative assets to properly reflect the credit quality of the counterparties. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of credit risk valuation adjustment to derivative liabilities to properly reflect the credit quality of the entity. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Details
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Namespace Prefix: |
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- Details
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- Details
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- Details
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- Details
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- Details
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Balance Type: |
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