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Investment Tax Credit - Additional Information (Detail) - CAD CAD in Millions | 12 Months Ended
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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
Name: | stn_InvestmentTaxCreditsAbstract
Namespace Prefix: | stn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration