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Income Taxes - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 CAD ($)
Income taxes [Abstract]
Adjustments of tax expense (income) by change in tax legislation	$ 9.1

X

- Definition

Adjustments of tax expense (income) recognised relating to tax legislation changes

+ References

No definition available.

+ Details

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Namespace Prefix:	stn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Income taxes

+ References

No definition available.

+ Details

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