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v2.4.1.9

Supplemental Oil and Gas Reserve Information - Unaudited - Net Proved, Proved Developed and Proved Undeveloped Reserves (Detail) | 1 Months Ended | 12 Months Ended
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Mar. 31, 2014 MBoe | Dec. 31, 2014 MMcf MBbls MBoe | Dec. 31, 2014 MBbls MBoe MMcf | Dec. 31, 2013 MBbls MMcf MBoe | Dec. 31, 2013 MMcf MBoe MBbls | Dec. 31, 2012 MMcf MBbls MBoe | Dec. 31, 2012 MBbls MBoe MMcf
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |  |  |  |
Proved reserves (Volume), beginning balance |  | 198,590 us-gaap_ProvedDevelopedAndUndevelopedReservesNet | 198,590 us-gaap_ProvedDevelopedAndUndevelopedReservesNet | 91,530 us-gaap_ProvedDevelopedAndUndevelopedReservesNet | 91,530 us-gaap_ProvedDevelopedAndUndevelopedReservesNet | 57,900 us-gaap_ProvedDevelopedAndUndevelopedReservesNet | 57,900 us-gaap_ProvedDevelopedAndUndevelopedReservesNet
Proved reserves (Energy), beginning balance |  | 227,920 us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy | 227,920 us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy | 143,345 us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy | 143,345 us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy | 78,715 us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy | 78,715 us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy
Revisions of previous estimates (Volume) |  | (12,290)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease | (23,069)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease | 3,390 us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease | 10,412 us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease | (8,495)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease | (567)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
Proved Undeveloped Reserves, Decrease from Estimated Net Proved Reserve Balance (Energy) |  | 21,411 oas_ProvedUndevelopedReservesDecreasefromEstimatedNetProvedReserveBalanceEnergy | 21,411 oas_ProvedUndevelopedReservesDecreasefromEstimatedNetProvedReserveBalanceEnergy |  |  |  |
Revisions of previous estimates (Energy) |  | (25,117)us-gaap_ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy | (25,117)us-gaap_ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy | 5,125 us-gaap_ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy | 5,125 us-gaap_ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy | (1,983)us-gaap_ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy | (1,983)us-gaap_ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy
Extensions, discoveries and other additions (Volume) |  | 70,449 us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions | 80,855 us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions | 40,784 us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions | 31,856 us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions | 45,759 us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions | 66,245 us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
Extensions, discoveries and other additions (Energy) |  | 92,596 us-gaap_ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy | 92,596 us-gaap_ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy | 46,094 us-gaap_ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy | 46,094 us-gaap_ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy | 73,871 us-gaap_ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy | 73,871 us-gaap_ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy
Sales of reserves in place (Volume) |  | (4,850)us-gaap_ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace | (7,640)us-gaap_ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace | 0 us-gaap_ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace | 0 us-gaap_ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace | 0 us-gaap_ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace | 0 us-gaap_ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace
Sales of reserves in place (Energy) | (8,448)us-gaap_ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy | (8,448)us-gaap_ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy | (8,448)us-gaap_ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy | 0 us-gaap_ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy | 0 us-gaap_ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy | 0 us-gaap_ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy | 0 us-gaap_ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy
Purchases of reserves in place (Volume) |  | 1,523 us-gaap_ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace | 1,546 us-gaap_ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace | 37,459 us-gaap_ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace | 49,631 us-gaap_ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace | 512 us-gaap_ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace | 881 us-gaap_ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace
Purchases of reserves in place (Energy) |  | 1,799 us-gaap_ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy | 1,799 us-gaap_ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy | 45,731 us-gaap_ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy | 45,731 us-gaap_ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy | 966 us-gaap_ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy | 966 us-gaap_ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy
Production (Volume) |  | (10,691)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction | (14,883)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction | (11,133)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction | (7,450)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction | (4,146)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction | (7,533)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
Production (Energy) |  | (16,664)us-gaap_ProvedDevelopedAndUndevelopedReserveProductionEnergy | (16,664)us-gaap_ProvedDevelopedAndUndevelopedReserveProductionEnergy | (12,375)us-gaap_ProvedDevelopedAndUndevelopedReserveProductionEnergy | (12,375)us-gaap_ProvedDevelopedAndUndevelopedReserveProductionEnergy | (8,224)us-gaap_ProvedDevelopedAndUndevelopedReserveProductionEnergy | (8,224)us-gaap_ProvedDevelopedAndUndevelopedReserveProductionEnergy
Net proved reserves (Volume), closing balance |  | 220,120 us-gaap_ProvedDevelopedAndUndevelopedReservesNet | 220,120 us-gaap_ProvedDevelopedAndUndevelopedReservesNet | 198,590 us-gaap_ProvedDevelopedAndUndevelopedReservesNet | 198,590 us-gaap_ProvedDevelopedAndUndevelopedReservesNet | 91,530 us-gaap_ProvedDevelopedAndUndevelopedReservesNet | 91,530 us-gaap_ProvedDevelopedAndUndevelopedReservesNet
Net proved reserves (Energy), closing balance |  | 272,086 us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy | 272,086 us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy | 227,920 us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy | 227,920 us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy | 143,345 us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy | 143,345 us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy
Proved developed reserves (Volume) |  | 114,016 us-gaap_ProvedDevelopedReservesVolume | 114,016 us-gaap_ProvedDevelopedReservesVolume | 106,774 us-gaap_ProvedDevelopedReservesVolume | 106,774 us-gaap_ProvedDevelopedReservesVolume | 44,695 us-gaap_ProvedDevelopedReservesVolume | 44,695 us-gaap_ProvedDevelopedReservesVolume
Proved developed reserves (Energy) |  | 146,343 us-gaap_ProvedDevelopedReservesBOE1 | 146,343 us-gaap_ProvedDevelopedReservesBOE1 | 122,136 us-gaap_ProvedDevelopedReservesBOE1 | 122,136 us-gaap_ProvedDevelopedReservesBOE1 | 70,051 us-gaap_ProvedDevelopedReservesBOE1 | 70,051 us-gaap_ProvedDevelopedReservesBOE1
Proved undeveloped reserve (Volume) |  | 106,104 us-gaap_ProvedUndevelopedReserveVolume | 106,104 us-gaap_ProvedUndevelopedReserveVolume | 91,816 us-gaap_ProvedUndevelopedReserveVolume | 91,816 us-gaap_ProvedUndevelopedReserveVolume | 46,835 us-gaap_ProvedUndevelopedReserveVolume | 46,835 us-gaap_ProvedUndevelopedReserveVolume
Proved undeveloped reserves (Energy) |  | 125,743 us-gaap_ProvedUndevelopedReserveBOE1 | 125,743 us-gaap_ProvedUndevelopedReserveBOE1 | 105,784 us-gaap_ProvedUndevelopedReserveBOE1 | 105,784 us-gaap_ProvedUndevelopedReserveBOE1 | 73,294 us-gaap_ProvedUndevelopedReserveBOE1 | 73,294 us-gaap_ProvedUndevelopedReserveBOE1

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- Definition Energy measure of increase in quantity of proved reserve of oil and gas resulting from the extension of the proved acreage of previously discovered reservoir or discovery of new field with proved reserve or of new reservoir of proved reserve in old field, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447 + Details
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- Definition Energy measure of proved reserve of oil and gas, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447 + Details
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- Definition Energy measure of decrease in quantity of proved reserve of oil and gas resulting from production, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447 + Details
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- Definition Energy measure of increase in quantity of proved reserve of oil and gas resulting from purchase of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447 + Details
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- Definition Energy measure of increase (decrease) in quantity of proved reserve of oil and gas related to revision of a previous estimate resulting from new information, except for an increase in proved acreage, or change in economic factors, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447 + Details
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- Definition Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447 + Details
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- Definition The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(a)(2)) -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph a -Subparagraph 2 -Article 4 + Details
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- Definition Production of proved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447 + Details
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- Definition Purchase of minerals in place. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447 + Details
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- Definition Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447 + Details
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- Definition Energy measure of decrease in quantity of proved reserve of oil and gas resulting from sale of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447 + Details
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- Definition Energy measure of interests in proved developed reserves of crude oil, including condensate and natural gas liquids, natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas. + References No definition available. + Details
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- Definition Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61797-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61884-109447 + Details
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- Definition Energy measure of proved undeveloped reserves of crude oil, including condensate and natural gas liquids, natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas. + References No definition available. + Details
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- Definition Net quantities of an enterprise's interests in proved undeveloped reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other renewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61797-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61884-109447 + Details
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