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Summary of Significant Accounting Policies - Net Changes in Capitalized Exploratory Well Costs (Detail) - USD ($) $ in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2020	Nov. 19, 2020	Dec. 31, 2021	Dec. 31, 2019
Increase (Decrease) in Capitalized Exploratory Well Costs that are Pending Determination of Proved Reserves [Roll Forward]
Beginning of period	$ 0	$ 0	$ 0	$ 4,457
Exploratory well cost additions (pending determination of proved reserves)	0	0	0	0
Exploratory well cost reclassifications (successful determination of proved reserves)	0	0	0	(4,222)
Exploratory well dry hole costs (unsuccessful in adding proved reserves)	0	0	0	(235)
Exploratory well cost reclassifications (canceled wells written off to predrill write-off)	0	0	1	0
End of period	$ 0	$ 0	$ 1	$ 0

X

- Definition

Reclassification to Well, Facilities, and Equipment Based on Cancelled Wells Written Off

+ References

No definition available.

+ Details

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Namespace Prefix:	oas_
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X

- Definition

Additions to capitalized exploratory well costs that were added during the reporting period pending the determination of proved reserves.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 1B
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=123377692&loc=SL6806780-109447

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X

- Definition

The amount of capitalized exploratory well costs that is pending the determination of proved reserves. This does not include amounts that were capitalized and subsequently expensed in the same annual period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123377692&loc=SL6806780-109447

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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X

- Definition

Previously capitalized costs of the drilling of wells that were reclassified as part of the costs of the enterprise's wells and related equipment and facilities at the time that proved reserves were found.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 1B
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=123377692&loc=SL6806780-109447

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- Definition

Dry hole costs from oil and gas producing activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 360
-Section 25
-Paragraph 9
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=96866604&loc=d3e64954-109465

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 23
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e62136-109447

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