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Consolidated Statements of Cash Flows (Parenthetical)	12 Months Ended
	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

X

- Definition

Class Of Warrant Or Right, Issued During The Period

+ References

No definition available.

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

X

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration