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Capital Commitments - Additional Information (Detail) - CAD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of finance lease and operating lease by lessee [Line Items]
Commitments to purchase property, plant and equipment	$ 113	$ 113
2021 [Member]
Disclosure of finance lease and operating lease by lessee [Line Items]
Commitments to purchase property, plant and equipment	24
2022 [Member]
Disclosure of finance lease and operating lease by lessee [Line Items]
Commitments to purchase property, plant and equipment	53
2023 [Member]
Disclosure of finance lease and operating lease by lessee [Line Items]
Commitments to purchase property, plant and equipment	$ 36

X

- Definition

The amount of future capital expenditures that the entity is committed to make.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items representing commitments.

+ References

No definition available.

+ Details

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Namespace Prefix:	pds_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: