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Potential Business Combination - Additional information (Detail) | 9 Months Ended
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Sep. 30, 2020
Bonterra [member] |
Disclosure of detailed information about business combination [line items] |
Description of shares issued | two common shares of Obsidian Energy for each Bonterra common share

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Description of number of shares issued or each share in acquiree. + References No definition available. + Details
Name: | obe_DescriptionOfNumberOfSharesIssuedForEachShareInAcquiree
Namespace Prefix: | obe_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_BusinessCombinationsAxis=obe_BonterraMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |