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Acquisitions (Details) - 2021 Williston Acquisition a in Thousands, $ in Millions	May 03, 2021 USD ($) a
Asset Acquisition [Line Items]
Acres acquired | a	95
Payments to acquire land	$ 745.0
Payments for deposit on asset acquisitions	$ 74.5

X

- Definition

Number of Acres Acquired, Net

+ References

No definition available.

+ Details

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Namespace Prefix:	oas_
Data Type:	dtr-types:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Payments for Asset Acquisitions, Deposit

+ References

No definition available.

+ Details

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Namespace Prefix:	oas_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

Name:	us-gaap_AssetAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Definition

The cash outflow from the acquisition of real estate intended to generate income for the owner; excludes land acquired for use by the owner.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585

+ Details

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X

- Details

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Namespace Prefix:
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