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v2.4.1.9

Condensed Consolidating Financial Statements - Schedule of Consolidating Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Current assets |  |  |  |
Cash and cash equivalents | $ 45,811 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 91,901 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 213,447 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 470,872 us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable — oil and gas revenues | 130,934 us-gaap_AccountsReceivableNetCurrent | 175,653 us-gaap_AccountsReceivableNetCurrent |  |
Accounts receivable — joint interest partners | 175,537 us-gaap_OilAndGasJointInterestBillingReceivablesCurrent | 139,459 us-gaap_OilAndGasJointInterestBillingReceivablesCurrent |  |
Accounts receivable – affiliates | 0 us-gaap_DueFromAffiliateCurrent |  |  |
Inventory | 21,354 us-gaap_InventoryNet | 20,652 us-gaap_InventoryNet |  |
Prepaid expenses | 14,273 us-gaap_PrepaidExpenseCurrent | 10,191 us-gaap_PrepaidExpenseCurrent |  |
Deferred income taxes |  | 6,335 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent |  |
Derivative instruments | 302,159 us-gaap_DerivativeAssetsCurrent | 2,264 us-gaap_DerivativeAssetsCurrent |  |
Advances to joint interest partners | 13 oas_AdvancesToJointInterestPartnersCurrent | 760 oas_AdvancesToJointInterestPartnersCurrent |  |
Other current assets | 6,526 us-gaap_OtherAssetsCurrent | 391 us-gaap_OtherAssetsCurrent |  |
Total current assets | 696,607 us-gaap_AssetsCurrent | 447,606 us-gaap_AssetsCurrent |  |
Property, plant and equipment |  |  |  |
Oil and gas properties (successful efforts method) | 5,966,140 us-gaap_OilAndGasPropertySuccessfulEffortMethodGross | 4,528,958 us-gaap_OilAndGasPropertySuccessfulEffortMethodGross |  |
Other property and equipment | 313,439 us-gaap_PropertyPlantAndEquipmentOther | 188,468 us-gaap_PropertyPlantAndEquipmentOther |  |
Less: accumulated depreciation, depletion, amortization and impairment | (1,092,793)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (637,676)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |  |
Total property, plant and equipment, net | 5,186,786 us-gaap_PropertyPlantAndEquipmentNet | 4,079,750 us-gaap_PropertyPlantAndEquipmentNet |  |
Assets held for sale |  | 137,066 us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsNoncurrent |  |
Derivative instruments | 13,348 us-gaap_DerivativeAssetsNoncurrent | 1,333 us-gaap_DerivativeAssetsNoncurrent |  |
Deferred costs and other assets | 41,671 us-gaap_DeferredCostsAndOtherAssets | 46,169 us-gaap_DeferredCostsAndOtherAssets |  |
Total assets | 5,938,412 us-gaap_Assets | 4,711,924 us-gaap_Assets |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |
Accounts payable | 20,958 us-gaap_AccountsPayableCurrent | 8,920 us-gaap_AccountsPayableCurrent |  |
Revenues and production taxes payable | 209,890 oas_RevenuesPayableAndProductionTaxesCurrent | 146,741 oas_RevenuesPayableAndProductionTaxesCurrent |  |
Accrued liabilities | 410,379 us-gaap_AccruedLiabilitiesCurrent | 241,830 us-gaap_AccruedLiabilitiesCurrent |  |
Accrued interest payable | 49,786 us-gaap_InterestPayableCurrent | 47,910 us-gaap_InterestPayableCurrent |  |
Deferred income taxes | 97,499 us-gaap_DeferredTaxLiabilitiesCurrent | 0 us-gaap_DeferredTaxLiabilitiesCurrent |  |
Derivative instruments | 0 us-gaap_DerivativeLiabilitiesCurrent | 8,188 us-gaap_DerivativeLiabilitiesCurrent |  |
Advances from joint interest partners | 6,616 oas_AdvancesFromJointInterestPartnersCurrent | 12,829 oas_AdvancesFromJointInterestPartnersCurrent |  |
Total current liabilities | 795,128 us-gaap_LiabilitiesCurrent | 466,418 us-gaap_LiabilitiesCurrent |  |
Long-term debt | 2,700,000 us-gaap_LongTermDebtNoncurrent | 2,535,570 us-gaap_LongTermDebtNoncurrent |  |
Deferred income taxes | 526,770 us-gaap_DeferredTaxLiabilitiesNoncurrent | 323,147 us-gaap_DeferredTaxLiabilitiesNoncurrent |  |
Asset retirement obligations | 42,097 us-gaap_AssetRetirementObligationsNoncurrent | 35,918 us-gaap_AssetRetirementObligationsNoncurrent |  |
Derivative instruments | 0 us-gaap_DerivativeLiabilitiesNoncurrent | 139 us-gaap_DerivativeLiabilitiesNoncurrent |  |
Other liabilities | 2,116 us-gaap_OtherLiabilitiesNoncurrent | 2,183 us-gaap_OtherLiabilitiesNoncurrent |  |
Total liabilities | 4,066,111 us-gaap_Liabilities | 3,363,375 us-gaap_Liabilities |  |
Stockholders’ equity |  |  |  |
Common stock, $0.01 par value: 300,000,000 shares authorized; 101,627,296 shares and 100,866,589 shares issued at December 31, 2014 and 2013, respectively | 1,001 us-gaap_CommonStockValue | 996 us-gaap_CommonStockValue |  |
Treasury stock, at cost: 285,677 shares and 167,155 shares at December 31, 2014 and 2013, respectively | (10,671)oas_TreasuryStockCost | (5,362)oas_TreasuryStockCost |  |
Additional paid-in-capital | 1,007,202 us-gaap_AdditionalPaidInCapitalCommonStock | 985,023 us-gaap_AdditionalPaidInCapitalCommonStock |  |
Retained earnings | 874,769 us-gaap_RetainedEarningsAccumulatedDeficit | 367,892 us-gaap_RetainedEarningsAccumulatedDeficit |  |
Total stockholders’ equity | 1,872,301 us-gaap_StockholdersEquity | 1,348,549 us-gaap_StockholdersEquity | 795,005 us-gaap_StockholdersEquity | 634,238 us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity | 5,938,412 us-gaap_LiabilitiesAndStockholdersEquity | 4,711,924 us-gaap_LiabilitiesAndStockholdersEquity |  |
Parent/Issuer [Member] |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 776 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 34,277 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 133,797 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 443,482 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Accounts receivable – affiliates | 781 us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 770 us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Prepaid expenses | 297 us-gaap_PrepaidExpenseCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 318 us-gaap_PrepaidExpenseCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total current assets | 1,854 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 35,365 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Property, plant and equipment |  |  |  |
Investments in and advances to subsidiaries | 4,032,494 oas_InvestmentsInAndAdvancesToAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,450,668 oas_InvestmentsInAndAdvancesToAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Deferred income taxes | 149,317 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 85,288 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Deferred costs and other assets | 29,435 us-gaap_DeferredCostsAndOtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 33,983 us-gaap_DeferredCostsAndOtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total assets | 4,213,100 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,605,304 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |
Accounts payable |  | 0 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accounts payable - affiliates | 91,459 us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 9,100 us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accrued liabilities |  | 33 us-gaap_AccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accrued interest payable | 49,340 us-gaap_InterestPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 47,622 us-gaap_InterestPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total current liabilities | 140,799 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 56,755 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Long-term debt | 2,200,000 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,200,000 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities | 2,340,799 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,256,755 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Stockholders’ equity |  |  |  |
Common stock, $0.01 par value: 300,000,000 shares authorized; 101,627,296 shares and 100,866,589 shares issued at December 31, 2014 and 2013, respectively | 1,001 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 996 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Treasury stock, at cost: 285,677 shares and 167,155 shares at December 31, 2014 and 2013, respectively | (10,671)oas_TreasuryStockCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (5,362)oas_TreasuryStockCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Additional paid-in-capital | 1,007,202 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 985,023 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Retained earnings | 874,769 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 367,892 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total stockholders’ equity | 1,872,301 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,348,549 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities and stockholders’ equity | 4,213,100 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,605,304 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Combined Guarantor Subsidiaries [Member] |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 45,035 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 57,624 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 79,650 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 27,390 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Accounts receivable — oil and gas revenues | 130,934 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 175,653 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Accounts receivable — joint interest partners | 175,537 us-gaap_OilAndGasJointInterestBillingReceivablesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 139,459 us-gaap_OilAndGasJointInterestBillingReceivablesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Accounts receivable – affiliates | 91,459 us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 9,100 us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Inventory | 21,354 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 20,652 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Prepaid expenses | 13,976 us-gaap_PrepaidExpenseCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 9,873 us-gaap_PrepaidExpenseCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Deferred income taxes |  | 6,335 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Derivative instruments | 302,159 us-gaap_DerivativeAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 2,264 us-gaap_DerivativeAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Advances to joint interest partners | 13 oas_AdvancesToJointInterestPartnersCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 760 oas_AdvancesToJointInterestPartnersCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other current assets | 6,526 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 391 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total current assets | 786,993 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 422,111 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Property, plant and equipment |  |  |  |
Oil and gas properties (successful efforts method) | 5,966,140 us-gaap_OilAndGasPropertySuccessfulEffortMethodGross / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 4,528,958 us-gaap_OilAndGasPropertySuccessfulEffortMethodGross / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other property and equipment | 313,439 us-gaap_PropertyPlantAndEquipmentOther / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 188,468 us-gaap_PropertyPlantAndEquipmentOther / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Less: accumulated depreciation, depletion, amortization and impairment | (1,092,793)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (637,676)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total property, plant and equipment, net | 5,186,786 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 4,079,750 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Assets held for sale |  | 137,066 us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Derivative instruments | 13,348 us-gaap_DerivativeAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,333 us-gaap_DerivativeAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Deferred costs and other assets | 12,236 us-gaap_DeferredCostsAndOtherAssets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 12,186 us-gaap_DeferredCostsAndOtherAssets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total assets | 5,999,363 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 4,652,446 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |
Accounts payable | 20,958 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 8,920 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Accounts payable - affiliates | 781 us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 770 us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Revenues and production taxes payable | 209,890 oas_RevenuesPayableAndProductionTaxesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 146,741 oas_RevenuesPayableAndProductionTaxesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Accrued liabilities | 410,379 us-gaap_AccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 241,797 us-gaap_AccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Accrued interest payable | 446 us-gaap_InterestPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 288 us-gaap_InterestPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Deferred income taxes | 97,499 us-gaap_DeferredTaxLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |
Derivative instruments |  | 8,188 us-gaap_DerivativeLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Advances from joint interest partners | 6,616 oas_AdvancesFromJointInterestPartnersCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 12,829 oas_AdvancesFromJointInterestPartnersCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total current liabilities | 746,569 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 419,533 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Long-term debt | 500,000 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 335,570 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Deferred income taxes | 676,087 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 408,435 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Asset retirement obligations | 42,097 us-gaap_AssetRetirementObligationsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 35,918 us-gaap_AssetRetirementObligationsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Derivative instruments |  | 139 us-gaap_DerivativeLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other liabilities | 2,116 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 2,183 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total liabilities | 1,966,869 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,201,778 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Stockholders’ equity |  |  |  |
Capital contributions from affiliates | 2,899,203 oas_CapitalContributions / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 2,930,978 oas_CapitalContributions / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Additional paid-in-capital | 8,743 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 8,743 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Retained earnings | 1,124,548 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 510,947 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total stockholders’ equity | 4,032,494 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 3,450,668 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total liabilities and stockholders’ equity | 5,999,363 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 4,652,446 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Intercompany Eliminations [Member] |  |  |  |
Current assets |  |  |  |
Accounts receivable – affiliates | (92,240)us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (9,870)us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Total current assets | (92,240)us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (9,870)us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Property, plant and equipment |  |  |  |
Investments in and advances to subsidiaries | (4,032,494)oas_InvestmentsInAndAdvancesToAffiliates / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (3,450,668)oas_InvestmentsInAndAdvancesToAffiliates / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Deferred income taxes | (149,317)us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (85,288)us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Total assets | (4,274,051)us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (3,545,826)us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |
Accounts payable - affiliates | (92,240)us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (9,870)us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Total current liabilities | (92,240)us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (9,870)us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Deferred income taxes | (149,317)us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (85,288)us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Total liabilities | (241,557)us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (95,158)us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Stockholders’ equity |  |  |  |
Capital contributions from affiliates | (2,899,203)oas_CapitalContributions / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (2,930,978)oas_CapitalContributions / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Additional paid-in-capital | (8,743)us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (8,743)us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Retained earnings | (1,124,548)us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (510,947)us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Total stockholders’ equity | (4,032,494)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (3,450,668)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Total liabilities and stockholders’ equity | $ (4,274,051)us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | $ (3,545,826)us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |

X
- Definition The total of the amounts received in advance for capital projects from our joint interest partners. + References No definition available. + Details
Name: | oas_AdvancesFromJointInterestPartnersCurrent
Namespace Prefix: | oas_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total of the amounts paid in advance to a third party for capital projects that will be reclassified to PP&E or expensed with the passage of time or the occurrence of a triggering event, which is expected to be within one year or the normal operating cycle (if longer). + References No definition available. + Details
Name: | oas_AdvancesToJointInterestPartnersCurrent
Namespace Prefix: | oas_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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