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Consolidated 50% Owned Subsidiaries, including Variable Interest Entities ("VIE") - Components of Noncontrolling Interest Subject to Mandatory Redemption (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Noncontrolling Interest [Abstract] |  |
Members’ interest subject to mandatory redemption | $ 40,000 | $ 40,000
Net accumulated earnings | 8,844 | 7,386
Total liability | $ 48,844 | $ 47,386

X
- Definition The Member's interest subject to mandatory redemption. + References No definition available. + Details
Name: | strl_MembersInterestSubjectToMandatoryRedemption
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The element that represents the member's interest subject to mandatory redemption and undistributed earnings. + References No definition available. + Details
Name: | strl_MembersInterestSubjectToMandatoryRedemptionAndUndistributedEarnings
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The net amount of undistributed earnings (distributed earnings) of domestic subsidiaries or domestic joint ventures intended to be permanent. + References No definition available. + Details
Name: | strl_UndistributedEarningsOfDomesticSubsidiariesNet
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_NoncontrollingInterestAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration