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Summary of Significant Accounting Policies (Details) - Anticipated	Dec. 31, 2020
Minimum
Subsequent Event [Line Items]
Expected reduction in capital expenditures (percent)	50.00%
Maximum
Subsequent Event [Line Items]
Expected reduction in capital expenditures (percent)	60.00%

X

- Definition

Capital Expenditures, Increase (Decrease), Percent

+ References

No definition available.

+ Details

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

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: