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Long-Term Debt - Additional Information (Detail) (USD $) | 12 Months Ended | 0 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 24, 2014 | Sep. 24, 2013 | Oct. 01, 2014 | Sep. 30, 2014 | Apr. 01, 2014 | Mar. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Deferred financing costs | $ 35,500,000 us-gaap_DeferredFinanceCostsNet |  |  |  |  |  |  |  |
Amortization of Financing Costs | 6,400,000 us-gaap_AmortizationOfFinancingCosts | 4,500,000 us-gaap_AmortizationOfFinancingCosts | 3,000,000 us-gaap_AmortizationOfFinancingCosts |  |  |  |  |  |
Collateral, Percent of reserve value required | 80.00%oas_DebtInstrumentCollateralOilandGasPropertiesEligiblePercentofReserveValueRequired |  |  |  |  |  |  |  |
Two Thousand Twenty Two Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior unsecured debt principal amount |  |  |  |  | 1,000,000,000.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = oas_TwoThousandTwentyTwoNotesMember |  |  |  |
Senior unsecured notes stated interest rate |  |  |  |  | 6.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = oas_TwoThousandTwentyTwoNotesMember |  |  |  |
Net proceeds from issuance of notes |  |  |  | 983,600,000 us-gaap_ProceedsFromIssuanceOfUnsecuredDebt / us-gaap_DebtInstrumentAxis = oas_TwoThousandTwentyTwoNotesMember |  |  |  |  |
Two Thousand Nineteen Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior unsecured debt principal amount |  |  | 400,000,000.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = oas_TwoThousandNineteenNotesMember |  |  |  |  |  |
Senior unsecured notes stated interest rate |  |  | 7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = oas_TwoThousandNineteenNotesMember |  |  |  |  |  |
Two Thousand Twenty One Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior unsecured debt principal amount |  |  | 400,000,000.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = oas_TwoThousandTwentyOneNotesMember |  |  |  |  |  |
Senior unsecured notes stated interest rate |  |  | 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = oas_TwoThousandTwentyOneNotesMember |  |  |  |  |  |
Two Thousand Twenty Three Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior unsecured debt principal amount |  |  | 400,000,000.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = oas_TwoThousandTwentyThreeNotesMember |  |  |  |  |  |
Senior unsecured notes stated interest rate |  |  | 6.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = oas_TwoThousandTwentyThreeNotesMember |  |  |  |  |  |
Unsecured Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Net proceeds from issuance of notes |  |  | 1,175,800,000 us-gaap_ProceedsFromIssuanceOfUnsecuredDebt / us-gaap_DebtInstrumentAxis = oas_UnsecuredSeniorNotesMember |  |  |  |  |  |
Redemption percentage, maximum | 35.00%oas_RedemptionPercentageMaximum / us-gaap_DebtInstrumentAxis = oas_UnsecuredSeniorNotesMember |  |  |  |  |  |  |  |
Percentage of minimum outstanding principal amount | 65.00%oas_PercentageOfMinimumOutstandingPrincipalAmount / us-gaap_DebtInstrumentAxis = oas_UnsecuredSeniorNotesMember |  |  |  |  |  |  |  |
Event of default by payment default | 10,000,000.0 oas_EventOfDefaultByPaymentDefault / us-gaap_DebtInstrumentAxis = oas_UnsecuredSeniorNotesMember |  |  |  |  |  |  |  |
Event of default by final judgments | 10,000,000.0 oas_EventOfDefaultByFinalJudgments / us-gaap_DebtInstrumentAxis = oas_UnsecuredSeniorNotesMember |  |  |  |  |  |  |  |
Long-term Debt | 2,200,000,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = oas_UnsecuredSeniorNotesMember |  |  |  |  |  |  |  |
Amended Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Commitment fee of borrowing base capacity not utilized | 0.375%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = oas_AmendedCreditFacilityMember |  |  |  |  |  |  |  |
Long-term Debt | 500,000,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = oas_AmendedCreditFacilityMember |  |  |  |  |  |  |  |
Outstanding letters of credit | 5,200,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = oas_AmendedCreditFacilityMember |  |  |  |  |  |  |  |
Letter of credit unused borrowing base capacity | 994,800,000 us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount / us-gaap_DebtInstrumentAxis = oas_AmendedCreditFacilityMember |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility maximum increase to aggregate commitments |  |  |  |  |  | 2,000,000,000.0 oas_LineOfCreditFacilityMaximumIncreaseToAggregateCommitments / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember | 1,750,000,000.0 oas_LineOfCreditFacilityMaximumIncreaseToAggregateCommitments / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember | 1,750,000,000.0 oas_LineOfCreditFacilityMaximumIncreaseToAggregateCommitments / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember | 1,500,000,000.0 oas_LineOfCreditFacilityMaximumIncreaseToAggregateCommitments / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember
Line of credit facility, maximum borrowing capacity | 1,500,000,000.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  |  |  |
Line of credit facility, capacity available for specific purpose other than for trade purchases | $ 2,500,000,000.0 us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate | 1.90%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember | 1.80%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  |  |
Unsecured Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Redemption term | 180 days |  |  |  |  |  |  |  |
Current Ratio [Member] | Amended Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Minimum current ratio | 1.0 oas_MinimumCurrentRatio / us-gaap_DebtInstrumentAxis = oas_AmendedCreditFacilityMember / us-gaap_DebtSecurityAxis = oas_CurrentRatioMember |  |  |  |  |  |  |  |
Minimum [Member] | EBITDAX [Member] | Amended Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Minimum debt to EBITDAX ratio | 2.5 oas_RatioOfEbitdaxToInterestExpenseNecessaryToMaintainCovenants / us-gaap_DebtInstrumentAxis = oas_AmendedCreditFacilityMember / us-gaap_IncomeTaxAuthorityAxis = oas_EarningsBeforeIncomeTaxDepreciationAndAmortizationOfExtraordinaryItemsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |

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- Definition Debt Instrument, Collateral, Oil and Gas Properties Eligible, Percent of Reserve Value Required + References No definition available. + Details
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- Definition Debt Instrument, Redemption, Term + References No definition available. + Details
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- Definition The aggregate amount of certain final judgments for which failure to pay would qualify as an event of default under the Indenture of the Notes. + References No definition available. + Details
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- Definition The principal amount of payment defaults that would qualify as an event of default under the Indenture of the Notes. + References No definition available. + Details
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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
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- Definition The minimum current ratio as required by the entity's debt agreement. + References No definition available. + Details
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- Definition Percentage of minimum outstanding principal amount. + References No definition available. + Details
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- Definition The minimum ratio of consolidated EBITDAX to consolidated Interest Expense as required by the entity's debt agreement. + References No definition available. + Details
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- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + 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 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Subparagraph b -Article 5 + Details
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- Definition For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer. + References No definition available. + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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