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Capital Management - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of capital management [abstract] |  |
Net debt ratio | 2.42 | 1.16

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- Definition Disclosure of capital management. + References No definition available. + Details
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Namespace Prefix: | stn_
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Period Type: | duration

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- Definition Net debt to EBITDA ratio. + References No definition available. + Details
Name: | stn_NetDebtToEBITDARatio
Namespace Prefix: | stn_
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