XML 42 R31.htm IDEA: XBRL DOCUMENT v3.5.0.2

Note 6 - Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details Textual) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2015
CEO of RHB [Member] | Upon Death [Member]
Business Acquisition, Percentage of Voting Interests Acquired	50.00%	50.00%
Myers [Member] | Upon Death [Member]
Business Acquisition, Percentage of Voting Interests Acquired	50.00%	50.00%
Income (Loss) from Subsidiaries, before Tax	$ 3.9	$ 3.9	$ 0.7

X

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount before tax of income (loss) of subsidiary attributable to the parent entity.

+ References

No definition available.

+ Details

Name:	us-gaap_IncomeLossFromSubsidiariesBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_TitleOfIndividualAxis=strl_CEOOfRHBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementScenarioAxis=strl_UponDeathMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TitleOfIndividualAxis=strl_MyersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: