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v2.4.1.9

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