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Weighted Average Shares Outstanding - Additional Information (Detail) - shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Earnings per share [abstract] |  |
Antidilutive effect of share options | 4,480,476 | 0

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Antidilutive securities excluded from computation of earnings per share amount1. + References No definition available. + Details
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Namespace Prefix: | stn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration