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Potential Business Combination - Additional information (Detail)	9 Months Ended
	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_
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- Definition

Description of number of shares issued or each share in acquiree.

+ References

No definition available.

+ Details

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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: