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Weighted Average Shares Outstanding - Schedule of Basic and Diluted Common Shares Outstanding, Calculated on Weighted Average Basis (Parenthetical) (Detail) | Dec. 31, 2018 | Dec. 31, 2017
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Earnings per share [abstract] |  |
Share options | 507,066 | 4,426,237

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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 Dilutive share options. + References No definition available. + Details
Name: | stn_DilutiveShareOptions
Namespace Prefix: | stn_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant