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Assets Held for Sale and Divestiture - Additional Information (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2014
Property, Plant and Equipment [Line Items] |  |  |  |
Proceeds from sale of properties | $ 324,852 us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment |  |  |
Gain on sale of properties | 186,999 us-gaap_GainLossOnSaleOfProperty | 0 us-gaap_GainLossOnSaleOfProperty | 0 us-gaap_GainLossOnSaleOfProperty |
Oil and gas properties |  | 191,384 oas_AssetsHeldforSaleOilandGasProperties |  |
Less: accumulated depreciation, depletion, amortization and impairment |  | (54,318)oas_AssetsHeldforSaleAccumulatedDepreciationDepletionAmortizationandImpairment |  |
Total assets | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssets | 137,066 us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssets |  |
Asset retirement obligation |  | 1,973 oas_LiabilitiesofAssetsHeldforSaleAssetRetirementObligation |  |
Total liabilities |  | 1,973 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation |  |
Net assets |  | 135,093 oas_AssetsHeldforSaleLongLivedNetofLiabilities |  |
Non-Operated OIl and Natural Gas Properties [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Proceeds from sale of properties |  |  |  | 324,900 us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = oas_NonOperatedOIlandNaturalGasPropertiesMember
Gain on sale of properties |  |  |  | $ 187,000 us-gaap_GainLossOnSaleOfProperty / us-gaap_PropertyPlantAndEquipmentByTypeAxis = oas_NonOperatedOIlandNaturalGasPropertiesMember

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- Definition Assets Held-for-Sale, Accumulated Depreciation, Depletion, Amortization and Impairment + References No definition available. + Details
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Balance Type: | credit
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- Definition Assets Held For Sale, Long Lived, Net of Liabilities + References No definition available. + Details
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- Definition Assets Held-for-Sale, Oil and Gas Properties + References No definition available. + Details
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Namespace Prefix: | oas_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Liabilities of Assets Held for Sale, Asset Retirement Obligation + References No definition available. + Details
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Namespace Prefix: | oas_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount classified as long lived assets attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of gain (loss) on sale or disposal of oil and gas property or timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount classified as liabilities attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760 + Details
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- Definition The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Details
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- Details
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