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Subsequent Events - Additional Information (Detail) (Not Designated as Hedging Instrument [Member], Energy Related Derivative [Member], Subsequent Event [Member]) | Feb. 28, 2015 MBbls
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2015 Swap Agreement [Member] |
Subsequent Event [Line Items] |
Total notional amount of oil barrels | 122 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
2016 Swap Agreement [Member] |
Subsequent Event [Line Items] |
Total notional amount of oil barrels | 62 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

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