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Investment Tax Credit - Additional Information (Detail) - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Investment tax credits [abstract]
Investment tax credits	CAD 9.6	CAD 5.9

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- Definition

Investment tax credits used to reduce administrative and marketing expenses.

+ References

No definition available.

+ Details

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

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- Definition

Investment tax credits [abstract]

+ References

No definition available.

+ Details

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