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Net Interest Expense and Other Net Finance Expense - Schedule of Other Net Finance Expense (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of other net finance expense [abstract] |  |
Realized loss on sale of FVOCI investment debt securities | $ 0.3 |
Amortization on FVOCI investment debt securities | 0.5 | $ 0.6
Bank charges | 5.6 | 8.6
Total other finance expense | 6.4 | 9.2
Realized gain on sale of FVOCI investment debt securities |  | (1.4)
Derecognition of notes payable | (0.7) | (0.7)
Other net finance expense | $ 5.7 | $ 7.1

X
- Definition The amount of bank and similar charges recognised by the entity as an expense. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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Period Type: | duration

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- Definition The amount of finance costs that the entity does not separately disclose in the same statement or note. [Refer: Finance costs] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Amortization on financial assets measured at fair value through other comprehensive income. + References No definition available. + Details
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- Definition Derecognition of notes payable. + References No definition available. + Details
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- Definition Disclosure of other net finance expense. + References No definition available. + Details
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- Definition Loss on sale of financial assets at fair value through other comprehensive income. + References No definition available. + Details
Name: | stn_LossOnSaleOfFinancialAssetsAtFairValueThroughOtherComprehensiveIncome
Namespace Prefix: | stn_
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- Definition Other finance expense. + References No definition available. + Details
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- Definition Other finance income on financial assets measured at fair value through other comprehensive income. + References No definition available. + Details
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