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Asset Retirement Obligations - Additional Information (Details) $ in Millions	Sep. 30, 2020 USD ($)
Asset Retirement Obligation Disclosure [Abstract]
ARO reclassified to liabilities subject to compromise	$ 57.6

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- Definition

Asset Retirement Obligations Reclassified to Liabilities Subject to Compromise

+ References

No definition available.

+ Details

Name:	oas_AssetRetirementObligationsReclassifiedToLiabilitiesSubjectToCompromise
Namespace Prefix:	oas_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_AssetRetirementObligationDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration