XML 103 R89.htm IDEA: XBRL DOCUMENT
v3.20.4

Property, Plant and Equipment - Additional Information (Detail) - USD ($) | 1 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Nov. 19, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment charge | $ 0 | $ 4,937,143,000 | $ 10,257,000 | $ 384,228,000
Proved Oil and Gas Properties |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment charge |  | 4,400,000,000 | 0 | 0
Proved Oil and Gas Properties | Williston Basin |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment charge |  | 3,800,000,000 |  |
Proved Oil and Gas Properties | Permian Basin |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment charge |  | 637,300,000 |  |
Unproved oil and gas properties |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment charge |  | 401,100,000 | 5,400,000 | 900,000
Other property and equipment |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment charge |  | 108,300,000 | $ 0 | $ 0
Other property and equipment | Midstream Equipment |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment charge |  | $ 1,600,000 |  |

X
- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66906256&loc=d3e66150-109466 + Details
Name: | us-gaap_ImpairmentOfOilAndGasProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=oas_ProvedOilAndGasPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=oas_WillistonBasinMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=oas_PermianBasinMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=oas_UnprovedOilAndGasPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_PropertyPlantAndEquipmentOtherTypesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=oas_MidstreamEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |