Structure of Obsidian Energy - Additional Information (Detail)	9 Months Ended
Sep. 30, 2020 Segment
Disclosure of operating segments [line items]
Number of operating segment	1
Percentage of ownership in petroleum and natural gas assets	100.00%
Obsidian [member]
Disclosure of operating segments [line items]
Proportion of ownership interest in joint arrangement	55.00%

The proportion of ownership interest in a joint operation attributable to the entity. [Refer: Joint operations [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2020-01-01
-Paragraph 21
-Subparagraph a
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_21_a_iv&doctype=Standard
-URIDate 2020-01-01

Name:	ifrs-full_ProportionOfOwnershipInterestInJointOperation
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration