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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
	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

X

- 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

X

- 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

X

- 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

X

- 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

X

- 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