XML 86 R74.htm IDEA: XBRL DOCUMENT
v3.19.2

Commitments and Contingencies - Additional Information (Details) bbl in Millions, Bcf in Millions, $ in Millions |  | 6 Months Ended
--- | --- | ---
Mar. 23, 2017 USD ($) | Jun. 30, 2019 USD ($) Bcf bbl
Loss Contingencies [Line Items] |  |
Required delivery time-frame under volume commitments time frame agreements |  | 10 years
Estimable future commitments under agreements | $ |  | $ 643.1
Mirada Litigation | Pending |  |
Loss Contingencies [Line Items] |  |
Damages sought (in excess of) | $ | $ 100.0 |
Crude Oil |  |
Loss Contingencies [Line Items] |  |
Minimum quantity to be delivered or transported (in MMBbl) |  | 48.3
Natural gas liquids |  |
Loss Contingencies [Line Items] |  |
Minimum quantity to be delivered or transported (in MMBbl) |  | 39.5
Natural Gas |  |
Loss Contingencies [Line Items] |  |
Minimum quantity to be delivered or transported (in MMBbl) | Bcf |  | 900.2
Water |  |
Loss Contingencies [Line Items] |  |
Minimum quantity to be delivered or transported (in MMBbl) |  | 31.7

X
- Definition Oil and Gas Delivery Commitments and Contracts, Maximum Term + References No definition available. + Details
Name: | oas_OilandGasDeliveryCommitmentsandContractsMaximumTerm
Namespace Prefix: | oas_
Data Type: | xbrli:durationItemType
Balance Type: | na
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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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=118942415&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=118942415&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=118942415&loc=d3e14326-108349 + Details
Name: | us-gaap_LossContingencyDamagesSoughtValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_LitigationCaseAxis=oas_MiradaLitigationMember
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_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_ProducedWaterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |