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Consolidated Statements of Cash Flows (Parenthetical) | 12 Months Ended
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Dec. 31, 2017 shares
Statement of Cash Flows [Abstract] |
Shares issued in acquisition of business (in shares) | 1,882,058
Warrants issued during the period (in shares) | 1,000,000

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Namespace Prefix: | strl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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