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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
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%

X

- 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

X

- Definition

Oil and Gas Properties, Measurement Input

+ References

No definition available.

+ Details

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Namespace Prefix:	oas_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- 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

X

- 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

X

- 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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X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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X

- Details

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X

- Details

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