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Subsequent Events Subsequent Events (Details) (USD $) | Mar. 31, 2015 financial_institution | Apr. 13, 2015 | Apr. 12, 2015 | May 07, 2015
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Subsequent Event [Line Items] |  |  |  |
Number of lenders in the bank group | 18 oas_NumberofFinancialInstitutions |  |  |
Revolving Credit Facility [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Line of credit facility maximum increase to aggregate commitments | 2,000,000,000 oas_LineOfCreditFacilityMaximumIncreaseToAggregateCommitments / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |  |  |
Line of credit facility, maximum borrowing capacity | 1,500,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |  |  |
Revolving Credit Facility [Member] | Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Line of credit facility maximum increase to aggregate commitments |  | 1,700,000,000.0 oas_LineOfCreditFacilityMaximumIncreaseToAggregateCommitments / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 2,000,000,000 oas_LineOfCreditFacilityMaximumIncreaseToAggregateCommitments / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Line of credit facility, maximum borrowing capacity |  | $ 1,525,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | $ 1,500,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Not Designated as Hedging Instrument [Member] | Energy Related Derivative [Member] | Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Average swap price (in dollars per barrel) |  |  |  | 61.28 us-gaap_DerivativeSwapTypeAverageFixedPrice / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Two Thousand Fifteen Swap Agreement [Member] | Not Designated as Hedging Instrument [Member] | Energy Related Derivative [Member] | Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Total Notional Amount of Oil (Barrels) |  |  |  | 1,102 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = oas_TwoThousandFifteenSwapAgreementMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Two Thousand Sixteen Swap Agreement [Member] | Not Designated as Hedging Instrument [Member] | Energy Related Derivative [Member] | Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Total Notional Amount of Oil (Barrels) |  |  |  | 703 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = oas_TwoThousandSixteenSwapAgreementMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Two Thousand Seventeen Swap Agreement [Member] | Not Designated as Hedging Instrument [Member] | Energy Related Derivative [Member] | Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Total Notional Amount of Oil (Barrels) |  |  |  | 31 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = oas_TwoThousandSeventeenSwapAgreementMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNonmonetaryNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition The aggregate commitment may be increased to this amount by increasing the commitment of one or more lender(s) under the credit facility. + References No definition available. + Details
Name: | oas_LineOfCreditFacilityMaximumIncreaseToAggregateCommitments
Namespace Prefix: | oas_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Number of Financial Institutions + References No definition available. + Details
Name: | oas_NumberofFinancialInstitutions
Namespace Prefix: | oas_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Average fixed price related to the group of price risk swap derivatives. + References No definition available. + Details
Name: | us-gaap_DerivativeSwapTypeAverageFixedPrice
Namespace Prefix: | us-gaap_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=oas_TwoThousandFifteenSwapAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=oas_TwoThousandSeventeenSwapAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=oas_TwoThousandSixteenSwapAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |