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Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) - Components of Noncontrolling Interest Subject to Mandatory Redemption (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013
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Components of Noncontrolling Interest Subject to Mandatory Redemption [Abstract] |  |  |
Member’s interest subject to mandatory redemption | $ 20,000 strl_MembersInterestSubjectToMandatoryRedemption | $ 20,000 strl_MembersInterestSubjectToMandatoryRedemption |
Undistributed earnings attributable to this interest | 6,079 us-gaap_UndistributedEarningsOfDomesticSubsidiaries | 3,989 us-gaap_UndistributedEarningsOfDomesticSubsidiaries | 3,700 us-gaap_UndistributedEarningsOfDomesticSubsidiaries
Earnings distributed | (3,200)strl_MandatoryRedemptionEarningsDistributed |  |
Total liability | $ 22,879 us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmountNoncurrent | $ 23,989 us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmountNoncurrent |

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- Details
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- Definition Represents the mandatory earnings distribution to non-controlling interest. + References No definition available. + Details
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- Definition Member’s interest subject to mandatory redemption. + References No definition available. + Details
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- Definition The amount that is required to be paid, determined under the conditions specified in the contract, if as of the reporting date, the holder of the share has exercised the right to or the shares are mandatorily redeemable after one year from the reporting date or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6940734&loc=d3e22047-110879 + Details
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- Definition Amount of undistributed earnings of domestic subsidiaries or domestic joint ventures intended to be permanent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(c) -URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 3 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28200-109314 + Details
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