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Trade and Other Receivables - Schedule of Reconciliation of Changes to Allowance for Doubtful Account (Detail) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of changes to allowance for doubtful account [Abstract] |  |
Balance, beginning of the year | CAD 28.2 | CAD 20.9
Provision for doubtful accounts | 11.6 | 17.0
Deductions | (8.7) | (8.0)
Impact of foreign exchange | (2.0) | (1.7)
Balance, end of the year | CAD 29.1 | CAD 28.2

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- Definition Additional allowance recognised in profit or loss allowance for doubtful accounts trade and other receivables. + References No definition available. + Details
Name: | stn_AdditionalAllowanceRecognisedInProfitOrLossAllowanceForDoubtfulAccountsTradeAndOtherReceivables
Namespace Prefix: | stn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Allowance For Doubtful Accounts Trade And Other Receivables + References No definition available. + Details
Name: | stn_AllowanceForDoubtfulAccountsTradeAndOtherReceivables
Namespace Prefix: | stn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Increase decrease through net exchange differences allowance for doubtful accounts trade and other receivables. + References No definition available. + Details
Name: | stn_IncreaseDecreaseThroughNetExchangeDifferencesAllowanceForDoubtfulAccountsTradeAndOtherReceivables
Namespace Prefix: | stn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Reconciliation of changes to allowance for doubtful account. + References No definition available. + Details
Name: | stn_ReconciliationOfChangesToAllowanceForDoubtfulAccountAbstract
Namespace Prefix: | stn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Utilisation allowance for doubtful account trade and other receivable. + References No definition available. + Details
Name: | stn_UtilisationAllowanceForDoubtfulAccountTradeAndOtherReceivable
Namespace Prefix: | stn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration