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Related-Party Disclosures - Summary of Joint Operations (Detail) - Joint operations [member]	12 Months Ended
	Dec. 31, 2019
Stantec-Bonatti, a Joint Venture [member] | Canada [member]
Disclosure of joint operations [line items]
Ownership Interests	85.00%
Jurisdiction	Canada
Stantec/SG, a Joint Venture [member] | United States [member]
Disclosure of joint operations [line items]
Ownership Interests	65.00%
Jurisdiction	United States
West, a Joint Venture [member] | United States [member]
Disclosure of joint operations [line items]
Ownership Interests	50.00%
Jurisdiction	United States
Starr ll, a Joint Venture [member] | United States [member]
Disclosure of joint operations [line items]
Ownership Interests	47.00%
Jurisdiction	United States

X

- 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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- Definition

The principal place of business of a joint operation. [Refer: Joint operations [member]; Principal place of business]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2019-01-01
-Paragraph 21
-Subparagraph a
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_21_a_iii&doctype=Standard
-URIDate 2019-03-27

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2019-01-01
-Paragraph 21
-Subparagraph a
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_21_a_iv&doctype=Standard
-URIDate 2019-03-27

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