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Business Segment Information - Summarized Financial Information of Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 180,387 us-gaap_OilAndGasRevenue | $ 349,519 us-gaap_OilAndGasRevenue |
Operating income (loss) | (33,635)us-gaap_OperatingIncomeLoss | 329,080 us-gaap_OperatingIncomeLoss |
Other income (expense) | 8,218 us-gaap_NonoperatingIncomeExpense | (57,608)us-gaap_NonoperatingIncomeExpense |
Income (loss) before income taxes | (25,417)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 271,472 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
Property, Plant and Equipment, Net | 5,329,362 us-gaap_PropertyPlantAndEquipmentNet |  | 5,186,786 us-gaap_PropertyPlantAndEquipmentNet
Total assets | 5,916,937 us-gaap_Assets |  | 5,938,412 us-gaap_Assets
Exploration and Production [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 173,859 us-gaap_OilAndGasRevenue / us-gaap_StatementBusinessSegmentsAxis = oas_ExplorationAndProductionMember | 331,847 us-gaap_OilAndGasRevenue / us-gaap_StatementBusinessSegmentsAxis = oas_ExplorationAndProductionMember |
Well Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 50,905 us-gaap_OilAndGasRevenue / us-gaap_StatementBusinessSegmentsAxis = oas_WellServicingMember | 52,406 us-gaap_OilAndGasRevenue / us-gaap_StatementBusinessSegmentsAxis = oas_WellServicingMember |
Midstream Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 17,642 us-gaap_OilAndGasRevenue / us-gaap_StatementBusinessSegmentsAxis = oas_MidstreamServicesMember | 9,353 us-gaap_OilAndGasRevenue / us-gaap_StatementBusinessSegmentsAxis = oas_MidstreamServicesMember |
Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 180,387 us-gaap_OilAndGasRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 349,519 us-gaap_OilAndGasRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |
Operating income (loss) | (33,635)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 329,080 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |
Other income (expense) | 8,218 us-gaap_NonoperatingIncomeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | (57,608)us-gaap_NonoperatingIncomeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |
Income (loss) before income taxes | (25,417)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 271,472 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |
Property, Plant and Equipment, Net | 5,329,362 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |  | 5,186,786 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Total assets | 5,916,937 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |  | 5,938,412 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Operating Segments [Member] | Exploration and Production [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 173,859 us-gaap_OilAndGasRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_ExplorationAndProductionMember | 331,847 us-gaap_OilAndGasRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_ExplorationAndProductionMember |
Operating income (loss) | (42,247)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_ExplorationAndProductionMember | 322,945 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_ExplorationAndProductionMember |
Other income (expense) | 8,239 us-gaap_NonoperatingIncomeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_ExplorationAndProductionMember | (57,660)us-gaap_NonoperatingIncomeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_ExplorationAndProductionMember |
Income (loss) before income taxes | (34,008)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_ExplorationAndProductionMember | 265,285 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_ExplorationAndProductionMember |
Property, Plant and Equipment, Net | 5,194,649 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_ExplorationAndProductionMember |  | 5,074,588 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_ExplorationAndProductionMember
Total assets | 5,758,513 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_ExplorationAndProductionMember |  | 5,802,295 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_ExplorationAndProductionMember
Operating Segments [Member] | Well Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 2,708 us-gaap_OilAndGasRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_WellServicingMember | 15,827 us-gaap_OilAndGasRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_WellServicingMember |
Operating income (loss) | 9,610 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_WellServicingMember | 13,452 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_WellServicingMember |
Other income (expense) | (2)us-gaap_NonoperatingIncomeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_WellServicingMember | 52 us-gaap_NonoperatingIncomeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_WellServicingMember |
Income (loss) before income taxes | 9,608 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_WellServicingMember | 13,504 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_WellServicingMember |
Property, Plant and Equipment, Net | 56,270 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_WellServicingMember |  | 58,767 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_WellServicingMember
Total assets | 330,239 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_WellServicingMember |  | 281,844 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_WellServicingMember
Operating Segments [Member] | Midstream Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 3,820 us-gaap_OilAndGasRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_MidstreamServicesMember | 1,845 us-gaap_OilAndGasRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_MidstreamServicesMember |
Operating income (loss) | 9,308 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_MidstreamServicesMember | 4,632 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_MidstreamServicesMember |
Other income (expense) | (19)us-gaap_NonoperatingIncomeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_MidstreamServicesMember |  |
Income (loss) before income taxes | 9,289 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_MidstreamServicesMember | 4,632 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_MidstreamServicesMember |
Property, Plant and Equipment, Net | 207,713 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_MidstreamServicesMember |  | 172,394 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_MidstreamServicesMember
Total assets | 265,627 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_MidstreamServicesMember |  | 212,685 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = oas_MidstreamServicesMember
Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (62,019)us-gaap_OilAndGasRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (44,087)us-gaap_OilAndGasRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |
Operating income (loss) | (10,306)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (11,949)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |
Income (loss) before income taxes | (10,306)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (11,949)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |
Property, Plant and Equipment, Net | (129,270)us-gaap_PropertyPlantAndEquipmentNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  | (118,963)us-gaap_PropertyPlantAndEquipmentNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Total assets | (437,442)us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  | (358,412)us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Segment Reconciling Items [Member] | Well Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 48,197 us-gaap_OilAndGasRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = oas_WellServicingMember | 36,579 us-gaap_OilAndGasRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = oas_WellServicingMember |
Segment Reconciling Items [Member] | Midstream Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 13,822 us-gaap_OilAndGasRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = oas_MidstreamServicesMember | $ 7,508 us-gaap_OilAndGasRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = oas_MidstreamServicesMember |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 + Details
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- Definition Aggregate revenue during the period related to oil and gas business activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62136-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62246-109447 + Details
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