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Capital Management - Additional Information (Detail) $ in Millions	Dec. 31, 2019 CAD ($)
Top of range [member]
Disclosure Of Capital Components Explanatory Line Items [Line Items]
Unencumbered cash	$ 150.0

X

- Definition

The amount of cash held by the entity. This does not include demand deposits.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2019-01-01
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard
-URIDate 2019-03-27

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Disclosure Of Capital Components Explanatory Line Items

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: