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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues
Total revenues	$ 180,387us-gaap_OilAndGasRevenue	$ 349,519us-gaap_OilAndGasRevenue
Expenses
General and administrative expenses	23,324us-gaap_GeneralAndAdministrativeExpense	23,520us-gaap_GeneralAndAdministrativeExpense
Other operating expenses		180,312us-gaap_OtherCostAndExpenseOperating
Total expenses	214,022us-gaap_CostsAndExpenses	203,832us-gaap_CostsAndExpenses
Gain on sale of properties	0us-gaap_GainLossOnSaleOfProperty	183,393us-gaap_GainLossOnSaleOfProperty
Operating income (loss)	(33,635)us-gaap_OperatingIncomeLoss	329,080us-gaap_OperatingIncomeLoss
Other income (expense)
Interest expense, net of capitalized interest	(38,784)us-gaap_InterestExpense	(40,158)us-gaap_InterestExpense
Other income (expense)	8,218oas_OtherIncomeExpenseCondensedConsolidating	(17,450)oas_OtherIncomeExpenseCondensedConsolidating
Income (loss) before income taxes	(25,417)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	271,472us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax benefit (expense)	7,376us-gaap_IncomeTaxExpenseBenefit	(101,519)us-gaap_IncomeTaxExpenseBenefit
Net income (loss)	(18,041)us-gaap_NetIncomeLoss	169,953us-gaap_NetIncomeLoss
Parent/Issuer [Member]
Expenses
General and administrative expenses		5,612us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total expenses	8,619us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating income (loss)	(8,619)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(5,612)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other income (expense)
Equity in earnings in subsidiaries	12,619oas_EquityInEarningsInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	196,933oas_EquityInEarningsInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest expense, net of capitalized interest		(37,424)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other income (expense)	(35,222)oas_OtherIncomeExpenseCondensedConsolidating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	3oas_OtherIncomeExpenseCondensedConsolidating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income (loss) before income taxes	(31,222)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	153,900us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax benefit (expense)	13,181us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	16,053us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income (loss)	(18,041)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	169,953us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Combined Guarantor Subsidiaries [Member]
Revenues
Total revenues	180,387us-gaap_OilAndGasRevenue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	349,519us-gaap_OilAndGasRevenue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Expenses
General and administrative expenses		17,908us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Other operating expenses		180,312us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Total expenses	205,403us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Gain on sale of properties		183,393us-gaap_GainLossOnSaleOfProperty / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Operating income (loss)	(25,016)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	334,692us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Other income (expense)
Interest expense, net of capitalized interest		(2,734)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Other income (expense)	43,440oas_OtherIncomeExpenseCondensedConsolidating / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	(17,453)oas_OtherIncomeExpenseCondensedConsolidating / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Income (loss) before income taxes	18,424us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	314,505us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Income tax benefit (expense)	(5,805)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	(117,572)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net income (loss)	12,619us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	196,933us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Intercompany Eliminations [Member]
Other income (expense)
Equity in earnings in subsidiaries	(12,619)oas_EquityInEarningsInSubsidiaries / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember	(196,933)oas_EquityInEarningsInSubsidiaries / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Income (loss) before income taxes	(12,619)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember	(196,933)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net income (loss)	$ (12,619)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember	$ (196,933)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember

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