XML 135 R121.htm IDEA: XBRL DOCUMENT v3.20.4

Commitments and Contingencies - Additional Information (Detail) $ in Thousands, ft³ in Millions, bbl in Millions					12 Months Ended
	Sep. 28, 2020 USD ($)	Sep. 14, 2020 USD ($)	Nov. 01, 2019 USD ($)	Mar. 23, 2017 USD ($)	Dec. 31, 2020 USD ($) bbl ft³
Surety Bond
Commitments And Contingencies [Line Items]
Off-balance sheet commitments					$ 49,000
Revolving credit facility
Commitments And Contingencies [Line Items]
Off-balance sheet commitments					$ 6,800
Volume Commitment Agreement
Commitments And Contingencies [Line Items]
Term of commitment agreements					10 years
Volume Commitment Agreement | Crude oil
Commitments And Contingencies [Line Items]
Minimum quantity of delivery | bbl					46.6
Volume Commitment Agreement | Natural Gas Liquids
Commitments And Contingencies [Line Items]
Minimum quantity of delivery | bbl					28.1
Volume Commitment Agreement | Natural gas
Commitments And Contingencies [Line Items]
Minimum quantity of delivery | ft³					704.1
Volume Commitment Agreement | Produced Water and Fresh Water
Commitments And Contingencies [Line Items]
Minimum quantity of delivery | bbl					8.7
Volume Commitment Agreement Exception
Commitments And Contingencies [Line Items]
Term of commitment agreements					24 years
Continuous Development Agreement
Commitments And Contingencies [Line Items]
Term of commitment agreements					8 years
Additional term of commitment agreements					5 years
Non-performance fees					$ 100,000
Pending Litigation | Mirada Litigation
Commitments And Contingencies [Line Items]
Damages sought (in excess of)			$ 200,000	$ 100,000
Settled Litigation | Mirada Litigation
Commitments And Contingencies [Line Items]
Amount proposed to be paid under Settlement Agreement	$ 42,800
Amount due upon effective plan date of the Plan	20,000
Litigation liability	$ 22,800
Settled Litigation | Solomon Litigation
Commitments And Contingencies [Line Items]
Amount due upon effective plan date of the Plan		$ 15

X

- Definition

Commitments And Contingencies [Line Items]

+ References

No definition available.

+ Details

Name:	oas_CommitmentsAndContingenciesLineItems
Namespace Prefix:	oas_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Litigation Settlement, Amount Awarded To Other Party, Portion Due On Effective Date of Plan

+ References

No definition available.

+ Details

Name:	oas_LitigationSettlementAmountAwardedToOtherPartyPortionDueOnEffectiveDateOfPlan
Namespace Prefix:	oas_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Oil and Gas Delivery Commitments and Contracts, Additional Duration Term

+ References

No definition available.

+ Details

Name:	oas_OilAndGasDeliveryCommitmentsAndContractsAdditionalDurationTerm
Namespace Prefix:	oas_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Oil and Gas Delivery Commitments and Contracts, Duration Term

+ References

No definition available.

+ Details

Name:	oas_OilAndGasDeliveryCommitmentsAndContractsDurationTerm
Namespace Prefix:	oas_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Oil and Gas Delivery Commitments and Contracts, Non-Performance Fees

+ References

No definition available.

+ Details

Name:	oas_OilAndGasDeliveryCommitmentsAndContractsNonPerformanceFees
Namespace Prefix:	oas_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Quantity of oil and gas subject to delivery commitment.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1207
-Paragraph (a)
-Subparagraph (2)

+ Details

Name:	srt_OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume
Namespace Prefix:	srt_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Carrying amount of reserve for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid within one year of the date of the statement of financial position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 55
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=116646759&loc=d3e15243-108350

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

+ Details

Name:	us-gaap_LitigationReserveCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

+ Details

Name:	us-gaap_LossContingencyDamagesSoughtValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82919202-210446

+ Details

Name:	us-gaap_OffBalanceSheetCreditLossLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_SuretyBondMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_OilAndGasDeliveryCommitmentsAndContractsAxis=oas_VolumeCommitmentAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_EnergyAxis=srt_CrudeOilMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_EnergyAxis=srt_NaturalGasLiquidsReservesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_EnergyAxis=srt_NaturalGasReservesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_EnergyAxis=oas_ProducedWaterAndFreshWaterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_OilAndGasDeliveryCommitmentsAndContractsAxis=oas_VolumeCommitmentAgreementExceptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_OilAndGasDeliveryCommitmentsAndContractsAxis=oas_ContinuousDevelopmentAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LitigationStatusAxis=us-gaap_PendingLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_LitigationCaseAxis=oas_MiradaLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LitigationStatusAxis=us-gaap_SettledLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_LitigationCaseAxis=oas_SolomonLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: