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Employee Costs - Schedule of Employee Benefits Cost (Detail) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of employee costs [abstract] |  |
Wages, salaries, and benefits | CAD 2,444.8 | CAD 2,211.7
Pension costs | 70.2 | 58.9
Share-based compensation | 9.5 | 8.9
Total employee costs | 2,524.5 | 2,279.5
Direct labor | 1,589.4 | 1,422.1
Indirect labor | 935.1 | 857.4
Total employee costs | CAD 2,524.5 | CAD 2,279.5

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- Definition The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_102&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_99&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 104 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_104&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 expense from share-based payment transactions with employees. + 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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- Definition The amount of expense from employee benefits (other than termination benefits) that are expected to be settled wholly within twelve months after the end of the annual reporting period in which the employees render the related services. + 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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- Definition Direct labor costs. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Disclosure of employee costs. + References No definition available. + Details
Name: | stn_DisclosureOfEmployeeCostsAbstract
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- Definition Employee pension costs. + References No definition available. + Details
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Balance Type: | debit
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- Definition Indirect labor costs. + References No definition available. + Details
Name: | stn_IndirectLaborCosts
Namespace Prefix: | stn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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