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Related-Party Disclosures - Schedule of Subsidiaries (Detail) - Subsidiaries [member]	12 Months Ended
	Dec. 31, 2019
3221969 Nova Scotia Company [member] | Nova Scotia, Canada [member]
Disclosure of subsidiaries [line items]
Jurisdiction of Incorporation	Nova Scotia, Canada
International Insurance Group Inc. [member] | Barbados [member]
Disclosure of subsidiaries [line items]
Jurisdiction of Incorporation	Barbados
Mustang Acquisition Holdings Inc. [member] | Delaware, United States [member]
Disclosure of subsidiaries [line items]
Jurisdiction of Incorporation	Delaware, United States
MWH International Inc. [member] | Delaware, United States [member]
Disclosure of subsidiaries [line items]
Jurisdiction of Incorporation	Delaware, United States
Stantec Australia Pty Ltd [member] | Australia [member]
Disclosure of subsidiaries [line items]
Jurisdiction of Incorporation	Australia
Stantec Consulting Caribbean Ltd. [member] | Barbados [member]
Disclosure of subsidiaries [line items]
Jurisdiction of Incorporation	Barbados
Stantec Consulting International LLC [member] | Arizona, United States [member]
Disclosure of subsidiaries [line items]
Jurisdiction of Incorporation	Arizona, United States
Stantec Consulting International Ltd. [member] | Canada [member]
Disclosure of subsidiaries [line items]
Jurisdiction of Incorporation	Canada
Stantec Consulting Ltd./Stantec Experts-conseils ltee [member] | Canada [member]
Disclosure of subsidiaries [line items]
Jurisdiction of Incorporation	Canada
Stantec Consulting Michigan Inc. [member] | Michigan, United States [member]
Disclosure of subsidiaries [line items]
Jurisdiction of Incorporation	Michigan, United States
Stantec Consulting Services Inc. [member] | New York, United States [member]
Disclosure of subsidiaries [line items]
Jurisdiction of Incorporation	New York, United States
Stantec Delaware II LLC [member] | Delaware, United States [member]
Disclosure of subsidiaries [line items]
Jurisdiction of Incorporation	Delaware, United States
Stantec Holding (2017) Limited [member] | United Kingdom [member]
Disclosure of subsidiaries [line items]
Jurisdiction of Incorporation	United Kingdom
Stantec Holdings II Ltd. [member] | Alberta, Canada [member]
Disclosure of subsidiaries [line items]
Jurisdiction of Incorporation	Alberta, Canada
Stantec New Zealand [member] | New Zealand [member]
Disclosure of subsidiaries [line items]
Jurisdiction of Incorporation	New Zealand
Stantec Technology International Inc. [member] | Delaware, United States [member]
Disclosure of subsidiaries [line items]
Jurisdiction of Incorporation	Delaware, United States
Stantec UK Limited. [member] | United Kingdom [member]
Disclosure of subsidiaries [line items]
Jurisdiction of Incorporation	United Kingdom

X

- Definition

The country in which a subsidiary of the entity is incorporated. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2019-01-01
-Paragraph 16
-Subparagraph b
-Clause ii
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-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2019-01-01
-Paragraph 17
-Subparagraph b
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2019-en-r&anchor=para_17_b_ii&doctype=Standard
-URIDate 2019-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2019-01-01
-Paragraph 12
-Subparagraph b
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-URIDate 2019-03-27

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2019-01-01
-Paragraph 19B
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_19B_b&doctype=Standard
-URIDate 2019-03-27

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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.

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