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v3.20.1

Summary of Significant Accounting Policies (Details) - Anticipated | Dec. 31, 2020
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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%

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- Definition Capital Expenditures, Increase (Decrease), Percent + References No definition available. + Details
Name: | oas_CapitalExpendituresIncreaseDecreasePercent
Namespace Prefix: | oas_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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- 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: |

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