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

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- Definition

Class Of Warrant Or Right, Issued During The Period

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

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- References

No definition available.

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