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Subsequent Events (Details) - Subsequent Event [Member] - Crude Oil [Member] bbl in Thousands | 1 Months Ended
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Jul. 31, 2017 $ / bbl bbl
2017 Swaps and Two-way Collar Options [Member] |
Subsequent Event [Line Items] |
Total ntional amount of oil (in Bbls) | bbl | 244
Weighted average floor price (in dollars per barrel) | $ / bbl | 49.43
2018 Swaps and Two-way Collar Options [Member] |
Subsequent Event [Line Items] |
Total ntional amount of oil (in Bbls) | bbl | 2,915
Weighted average floor price (in dollars per barrel) | $ / bbl | 48.59
2019 Swaps and Two-way Collar Options [Member] |
Subsequent Event [Line Items] |
Total ntional amount of oil (in Bbls) | bbl | 248
Weighted average floor price (in dollars per barrel) | $ / bbl | 48.49

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- Definition The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract. + References No definition available. + Details
Name: | us-gaap_DerivativeAverageFloorPrice
Namespace Prefix: | us-gaap_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

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- Definition Nominal volume used to calculate payments on a derivative instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | duration

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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
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_EnergyAxis=us-gaap_CrudeOilMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=oas_TwoThousandSeventeenSwapsandTwowayCollarOptionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=oas_TwoThousandEighteenSwapsandTwowayCollarOptionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=oas_TwoThousandNineteenSwapsandTwowayCollarOptionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |