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Net Interest Expense and Other Net Finance Expense - Schedule of Other Net Finance Expense (Detail) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of other net finance expense [abstract] |  |
Amortization on available-for-sale investment debt securities | CAD 0.6 | CAD 0.4
Bank charges | 8.6 | 7.4
Total other finance expense | 9.2 | 7.8
Realized gain on sale of available-for-sale investment debt securities | (1.4) | (0.1)
Derecognition of notes payable | (0.7) | (1.3)
Other net finance expense | CAD 7.1 | CAD 6.4

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 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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Balance Type: | debit
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 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Amortization on available for sale investment debt securities. + References No definition available. + Details
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- Definition Derecognition of notes payable. + References No definition available. + Details
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Namespace Prefix: | stn_
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Period Type: | duration

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- Definition Disclosure of other net finance expense. + References No definition available. + Details
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- Definition Other finance expense. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Other finance income on available for sale financial assets. + References No definition available. + Details
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