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v2.4.1.9

Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash and cash equivalents | $ 10,188 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 45,811 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 56,298 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 91,901 us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable | 243,169 oas_AccountsReceivableNetCurrentandOilandGasBillingsCondensedConsolidating | 306,471 oas_AccountsReceivableNetCurrentandOilandGasBillingsCondensedConsolidating |  |
Prepaid expenses | 16,954 us-gaap_PrepaidExpenseCurrent | 14,273 us-gaap_PrepaidExpenseCurrent |  |
Other current assets | 293,230 oas_OtherAssetsCurrentCondensedConsolidating | 330,052 oas_OtherAssetsCurrentCondensedConsolidating |  |
Oil and gas properties (successful efforts method) | 6,187,638 us-gaap_OilAndGasPropertySuccessfulEffortMethodGross | 5,966,140 us-gaap_OilAndGasPropertySuccessfulEffortMethodGross |  |
Other property and equipment | 356,940 us-gaap_PropertyPlantAndEquipmentOther | 313,439 us-gaap_PropertyPlantAndEquipmentOther |  |
Less: accumulated depreciation, depletion, amortization and impairment | (1,215,216)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (1,092,793)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |  |
Other long-term assets | 40,988 oas_OtherLongTermAssetsCondensedConsolidating | 55,019 oas_OtherLongTermAssetsCondensedConsolidating |  |
Total assets | 5,916,937 us-gaap_Assets | 5,938,412 us-gaap_Assets |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |
Accounts payable | 9,339 us-gaap_AccountsPayableCurrent | 20,958 us-gaap_AccountsPayableCurrent |  |
Other current liabilities | 632,900 us-gaap_OtherLiabilitiesCurrent | 774,170 us-gaap_OtherLiabilitiesCurrent |  |
Long-term debt | 2,365,000 us-gaap_LongTermDebtNoncurrent | 2,700,000 us-gaap_LongTermDebtNoncurrent |  |
Other long-term liabilities | 585,453 oas_OtherLiabilitiesNoncurrentCondensedConsolidating | 570,983 oas_OtherLiabilitiesNoncurrentCondensedConsolidating |  |
Common stock | 1,372 us-gaap_CommonStockValue | 1,001 us-gaap_CommonStockValue |  |
Other equity | 2,322,873 oas_StockholdersEquityOtherEquity |  |  |
Equity | 2,324,245 us-gaap_StockholdersEquity | 1,872,301 us-gaap_StockholdersEquity |  |
Total liabilities and stockholders’ equity | 5,916,937 us-gaap_LiabilitiesAndStockholdersEquity | 5,938,412 us-gaap_LiabilitiesAndStockholdersEquity |  |
Parent/Issuer [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 774 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 776 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 936 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 34,277 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Accounts receivable – affiliates | 1,032 us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 781 us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Prepaid expenses |  | 297 us-gaap_PrepaidExpenseCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other current assets | 148 oas_OtherAssetsCurrentCondensedConsolidating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Investments in and advances to subsidiaries | 4,499,571 oas_InvestmentsInAndAdvancesToAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,032,494 oas_InvestmentsInAndAdvancesToAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other long-term assets | 190,812 oas_OtherLongTermAssetsCondensedConsolidating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 178,752 oas_OtherLongTermAssetsCondensedConsolidating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total assets | 4,692,337 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,213,100 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |
Accounts payable – affiliates | 143,517 us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 91,459 us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other current liabilities | 24,575 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 49,340 us-gaap_OtherLiabilitiesCurrent / 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 |  |
Common stock | 1,372 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Other equity | 2,322,873 oas_StockholdersEquityOtherEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Equity |  | 1,872,301 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities and stockholders’ equity | 4,692,337 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,213,100 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Combined Guarantor Subsidiaries [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 9,414 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 45,035 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 55,362 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 57,624 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Accounts receivable | 243,169 oas_AccountsReceivableNetCurrentandOilandGasBillingsCondensedConsolidating / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 306,471 oas_AccountsReceivableNetCurrentandOilandGasBillingsCondensedConsolidating / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Accounts receivable – affiliates | 143,517 us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 91,459 us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Prepaid expenses |  | 13,976 us-gaap_PrepaidExpenseCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other current assets | 293,082 oas_OtherAssetsCurrentCondensedConsolidating / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 330,052 oas_OtherAssetsCurrentCondensedConsolidating / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Oil and gas properties (successful efforts method) | 6,187,638 us-gaap_OilAndGasPropertySuccessfulEffortMethodGross / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 5,966,140 us-gaap_OilAndGasPropertySuccessfulEffortMethodGross / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other property and equipment | 356,940 us-gaap_PropertyPlantAndEquipmentOther / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 313,439 us-gaap_PropertyPlantAndEquipmentOther / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Less: accumulated depreciation, depletion, amortization and impairment | (1,215,216)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (1,092,793)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other long-term assets | 12,674 oas_OtherLongTermAssetsCondensedConsolidating / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 25,584 oas_OtherLongTermAssetsCondensedConsolidating / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total assets | 6,031,218 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 5,999,363 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |
Accounts payable | 9,339 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 20,958 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Accounts payable – affiliates | 1,032 us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 781 us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other current liabilities | 608,325 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 724,830 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Long-term debt | 165,000 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 500,000 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other long-term liabilities | 747,951 oas_OtherLiabilitiesNoncurrentCondensedConsolidating / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 720,300 oas_OtherLiabilitiesNoncurrentCondensedConsolidating / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other equity | 4,499,571 oas_StockholdersEquityOtherEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |
Equity |  | 4,032,494 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total liabilities and stockholders’ equity | 6,031,218 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 5,999,363 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Intercompany Eliminations [Member] |  |  |  |
ASSETS |  |  |  |
Accounts receivable – affiliates | (144,549)us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (92,240)us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Investments in and advances to subsidiaries | (4,499,571)oas_InvestmentsInAndAdvancesToAffiliates / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (4,032,494)oas_InvestmentsInAndAdvancesToAffiliates / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Other long-term assets | (162,498)oas_OtherLongTermAssetsCondensedConsolidating / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (149,317)oas_OtherLongTermAssetsCondensedConsolidating / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Total assets | (4,806,618)us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (4,274,051)us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |
Accounts payable – affiliates | (144,549)us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (92,240)us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Other long-term liabilities | (162,498)oas_OtherLiabilitiesNoncurrentCondensedConsolidating / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (149,317)oas_OtherLiabilitiesNoncurrentCondensedConsolidating / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Other equity | (4,499,571)oas_StockholdersEquityOtherEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |
Equity |  | (4,032,494)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Total liabilities and stockholders’ equity | $ (4,806,618)us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | $ (4,274,051)us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |

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