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Condensed Consolidating Financial Statements - Schedule of Consolidating Statement of Operations (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Oil and gas revenues									$ 1,304,004,000us-gaap_OilAndGasSalesRevenue	$ 1,084,412,000us-gaap_OilAndGasSalesRevenue	$ 670,491,000us-gaap_OilAndGasSalesRevenue
Well services and midstream revenues									86,224,000us-gaap_RevenueOilAndGasServices	57,587,000us-gaap_RevenueOilAndGasServices	16,177,000us-gaap_RevenueOilAndGasServices
Total revenues	299,672,000us-gaap_OilAndGasRevenue	368,659,000us-gaap_OilAndGasRevenue	372,378,000us-gaap_OilAndGasRevenue	349,519,000us-gaap_OilAndGasRevenue	333,615,000us-gaap_OilAndGasRevenue	305,498,000us-gaap_OilAndGasRevenue	254,582,000us-gaap_OilAndGasRevenue	248,304,000us-gaap_OilAndGasRevenue	1,390,228,000us-gaap_OilAndGasRevenue	1,141,999,000us-gaap_OilAndGasRevenue	686,668,000us-gaap_OilAndGasRevenue
Expenses
Lease operating expenses									169,600,000us-gaap_LeaseOperatingExpense	94,634,000us-gaap_LeaseOperatingExpense	54,924,000us-gaap_LeaseOperatingExpense
Well services and midstream operating expenses									50,252,000us-gaap_WellServiceExpense	30,713,000us-gaap_WellServiceExpense	11,774,000us-gaap_WellServiceExpense
Marketing, transportation and gathering expenses									29,133,000us-gaap_GasGatheringTransportationMarketingAndProcessingCosts	25,924,000us-gaap_GasGatheringTransportationMarketingAndProcessingCosts	9,257,000us-gaap_GasGatheringTransportationMarketingAndProcessingCosts
Production taxes									127,648,000us-gaap_ProductionTaxExpense	100,537,000us-gaap_ProductionTaxExpense	62,965,000us-gaap_ProductionTaxExpense
Depreciation, depletion and amortization									412,334,000us-gaap_DepreciationDepletionAndAmortization	307,055,000us-gaap_DepreciationDepletionAndAmortization	206,734,000us-gaap_DepreciationDepletionAndAmortization
Exploration expenses									3,064,000us-gaap_ExplorationExpense	2,260,000us-gaap_ExplorationExpense	3,250,000us-gaap_ExplorationExpense
Impairment of oil and gas properties									47,238,000us-gaap_ImpairmentOfOilAndGasProperties	1,168,000us-gaap_ImpairmentOfOilAndGasProperties	3,581,000us-gaap_ImpairmentOfOilAndGasProperties
General and administrative expenses									92,306,000us-gaap_GeneralAndAdministrativeExpense	75,310,000us-gaap_GeneralAndAdministrativeExpense	57,190,000us-gaap_GeneralAndAdministrativeExpense
Total expenses									931,575,000us-gaap_CostsAndExpenses	637,601,000us-gaap_CostsAndExpenses	409,675,000us-gaap_CostsAndExpenses
Gain on sale of properties									186,999,000us-gaap_GainLossOnSaleOfProperty	0us-gaap_GainLossOnSaleOfProperty	0us-gaap_GainLossOnSaleOfProperty
Operating income	15,924,000us-gaap_OperatingIncomeLoss	134,103,000us-gaap_OperatingIncomeLoss	166,545,000us-gaap_OperatingIncomeLoss	329,080,000us-gaap_OperatingIncomeLoss	122,133,000us-gaap_OperatingIncomeLoss	150,862,000us-gaap_OperatingIncomeLoss	113,450,000us-gaap_OperatingIncomeLoss	117,953,000us-gaap_OperatingIncomeLoss	645,652,000us-gaap_OperatingIncomeLoss	504,398,000us-gaap_OperatingIncomeLoss	276,993,000us-gaap_OperatingIncomeLoss
Other income (expense)
Net gain (loss) on derivative instruments									327,011,000us-gaap_DerivativeGainLossOnDerivativeNet	(35,432,000)us-gaap_DerivativeGainLossOnDerivativeNet	34,164,000us-gaap_DerivativeGainLossOnDerivativeNet
Interest expense, net of capitalized interest									(158,390,000)us-gaap_InterestExpense	(107,165,000)us-gaap_InterestExpense	(70,143,000)us-gaap_InterestExpense
Other income (expense)									195,000us-gaap_OtherNonoperatingIncomeExpense	1,216,000us-gaap_OtherNonoperatingIncomeExpense	4,860,000us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense)									168,816,000us-gaap_NonoperatingIncomeExpense	(141,381,000)us-gaap_NonoperatingIncomeExpense	(31,119,000)us-gaap_NonoperatingIncomeExpense
Income before income taxes									814,468,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	363,017,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	245,874,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax benefit (expense)									(307,591,000)us-gaap_IncomeTaxExpenseBenefit	(135,058,000)us-gaap_IncomeTaxExpenseBenefit	(92,486,000)us-gaap_IncomeTaxExpenseBenefit
Net income	176,504,000us-gaap_NetIncomeLoss	121,587,000us-gaap_NetIncomeLoss	38,833,000us-gaap_NetIncomeLoss	169,953,000us-gaap_NetIncomeLoss	54,490,000us-gaap_NetIncomeLoss	54,499,000us-gaap_NetIncomeLoss	67,119,000us-gaap_NetIncomeLoss	51,851,000us-gaap_NetIncomeLoss	506,877,000us-gaap_NetIncomeLoss	227,959,000us-gaap_NetIncomeLoss	153,388,000us-gaap_NetIncomeLoss
Parent/Issuer [Member]
Expenses
General and administrative expenses									23,528,000us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	14,044,000us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	12,591,000us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total expenses									23,528,000us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	14,044,000us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	12,591,000us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating income									(23,528,000)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(14,044,000)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(12,591,000)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other income (expense)
Equity in earnings of subsidiaries									613,601,000oas_EquityInEarningsInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	299,459,000oas_EquityInEarningsInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	202,924,000oas_EquityInEarningsInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest expense, net of capitalized interest									(147,230,000)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(99,663,000)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(67,651,000)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other income (expense)									5,000us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(335,000)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,118,000us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total other income (expense)									466,376,000us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	199,461,000us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	136,391,000us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before income taxes									442,848,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	185,417,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	123,800,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax benefit (expense)									64,029,000us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	42,542,000us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	29,588,000us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income									506,877,000us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	227,959,000us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	153,388,000us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Combined Guarantor Subsidiaries [Member]
Revenues
Oil and gas revenues									1,304,004,000us-gaap_OilAndGasSalesRevenue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	1,084,412,000us-gaap_OilAndGasSalesRevenue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	670,491,000us-gaap_OilAndGasSalesRevenue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Well services and midstream revenues									86,224,000us-gaap_RevenueOilAndGasServices / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	57,587,000us-gaap_RevenueOilAndGasServices / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	16,177,000us-gaap_RevenueOilAndGasServices / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Total revenues									1,390,228,000us-gaap_OilAndGasRevenue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	1,141,999,000us-gaap_OilAndGasRevenue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	686,668,000us-gaap_OilAndGasRevenue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Expenses
Lease operating expenses									169,600,000us-gaap_LeaseOperatingExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	94,634,000us-gaap_LeaseOperatingExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	54,924,000us-gaap_LeaseOperatingExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Well services and midstream operating expenses									50,252,000us-gaap_WellServiceExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	30,713,000us-gaap_WellServiceExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	11,774,000us-gaap_WellServiceExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Marketing, transportation and gathering expenses									29,133,000us-gaap_GasGatheringTransportationMarketingAndProcessingCosts / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	25,924,000us-gaap_GasGatheringTransportationMarketingAndProcessingCosts / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	9,257,000us-gaap_GasGatheringTransportationMarketingAndProcessingCosts / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Production taxes									127,648,000us-gaap_ProductionTaxExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	100,537,000us-gaap_ProductionTaxExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	62,965,000us-gaap_ProductionTaxExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Depreciation, depletion and amortization									412,334,000us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	307,055,000us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	206,734,000us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Exploration expenses									3,064,000us-gaap_ExplorationExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	2,260,000us-gaap_ExplorationExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	3,250,000us-gaap_ExplorationExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Impairment of oil and gas properties									47,238,000us-gaap_ImpairmentOfOilAndGasProperties / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	1,168,000us-gaap_ImpairmentOfOilAndGasProperties / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	3,581,000us-gaap_ImpairmentOfOilAndGasProperties / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
General and administrative expenses									68,778,000us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	61,266,000us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	44,599,000us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Total expenses									908,047,000us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	623,557,000us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	397,084,000us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Gain on sale of properties									186,999,000us-gaap_GainLossOnSaleOfProperty / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Operating income									669,180,000us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	518,442,000us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	289,584,000us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Other income (expense)
Net gain (loss) on derivative instruments									327,011,000us-gaap_DerivativeGainLossOnDerivativeNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	(35,432,000)us-gaap_DerivativeGainLossOnDerivativeNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	34,164,000us-gaap_DerivativeGainLossOnDerivativeNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Interest expense, net of capitalized interest									(11,160,000)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	(7,502,000)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	(2,492,000)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Other income (expense)									190,000us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	1,551,000us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	3,742,000us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Total other income (expense)									316,041,000us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	(41,383,000)us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	35,414,000us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Income before income taxes									985,221,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	477,059,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	324,998,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Income tax benefit (expense)									(371,620,000)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	(177,600,000)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	(122,074,000)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net income									613,601,000us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	299,459,000us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	202,924,000us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Intercompany Eliminations [Member]
Other income (expense)
Equity in earnings of subsidiaries									(613,601,000)oas_EquityInEarningsInSubsidiaries / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember	(299,459,000)oas_EquityInEarningsInSubsidiaries / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember	(202,924,000)oas_EquityInEarningsInSubsidiaries / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Total other income (expense)									(613,601,000)us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember	(299,459,000)us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember	(202,924,000)us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Income before income taxes									(613,601,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember	(299,459,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember	(202,924,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net income									$ (613,601,000)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember	$ (299,459,000)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember	$ (202,924,000)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember

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Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells.

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Cost incurred related to the gas activities, such as transportation, marketing and processing crude oil, natural gas and refined petroleum products.

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