XML 38 R32.htm IDEA: XBRL DOCUMENT v3.2.0.727

Note 3 - Construction Joint Ventures (Details) - Jun. 30, 2015 - USD ($) $ in Millions	Total
Note 3 - Construction Joint Ventures (Details) [Line Items]
Construction Backlog Attributable to Project Performed by Joint Ventures	$ 13
Shimmick Construction Company [Member]
Note 3 - Construction Joint Ventures (Details) [Line Items]
Equity Method Investment, Ownership Percentage	30.00%

X

- Definition

Amount of construction backlog attributable to project performed by joint ventures.

+ References

No definition available.

+ Details

Name:	strl_ConstructionBacklogAttributableToProjectPerformedByJointVentures
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	strl_Note3ConstructionJointVenturesDetailsLineItems
Namespace Prefix:	strl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 323



-SubTopic 10



-Section 50



-Paragraph 3



-Subparagraph (a)(1)



-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

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

X

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=strl_ShimmickConstructionCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: