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Note 17 - Employee Benefit Plans (Details) - Participation in Multiemployer Defined Benefit Pension Plan (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 17 - Employee Benefit Plans (Details) - Participation in Multiemployer Defined Benefit Pension Plan [Line Items] |  |  |  |  |  |
Contributions | $ 10,808,000 us-gaap_MultiemployerPlanPeriodContributions | [1] | $ 6,435,000 us-gaap_MultiemployerPlanPeriodContributions |  | $ 5,541,000 us-gaap_MultiemployerPlanPeriodContributions |
Pension Trust Fund for Operating Engineers Pension Plan [Member] |  |  |  |  |  |
Note 17 - Employee Benefit Plans (Details) - Participation in Multiemployer Defined Benefit Pension Plan [Line Items] |  |  |  |  |  |
Certified Zone Status | Red | [2] | Red | [2] |  |
FIP/RP Status Pending/ Implemented | Yes | [1] |  |  |  |
Contributions | 1,757,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = strl_PensionTrustFundForOperatingEngineersPensionPlanMember |  | 1,654,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = strl_PensionTrustFundForOperatingEngineersPensionPlanMember |  | 508,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = strl_PensionTrustFundForOperatingEngineersPensionPlanMember |
Surcharge Imposed | No |  |  |  |  |
Expiration Date of Collective Bargaining Agreement | Jun. 30, 2016 | [3] |  |  |  |
Laborers Pension Trust for Northern California [Member] |  |  |  |  |  |
Note 17 - Employee Benefit Plans (Details) - Participation in Multiemployer Defined Benefit Pension Plan [Line Items] |  |  |  |  |  |
Certified Zone Status | Yellow | [2] | Yellow | [2] |  |
FIP/RP Status Pending/ Implemented | Yes | [1] |  |  |  |
Contributions | 1,447,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = strl_LaborersPensionTrustForNorthernCaliforniaMember |  | 897,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = strl_LaborersPensionTrustForNorthernCaliforniaMember |  | 431,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = strl_LaborersPensionTrustForNorthernCaliforniaMember |
Surcharge Imposed | No |  |  |  |  |
Expiration Date of Collective Bargaining Agreement | Jun. 30, 2019 | [3] |  |  |  |
Carpenter Funds Administrative Office [Member] |  |  |  |  |  |
Note 17 - Employee Benefit Plans (Details) - Participation in Multiemployer Defined Benefit Pension Plan [Line Items] |  |  |  |  |  |
Certified Zone Status | Red | [2] | Red | [2] |  |
FIP/RP Status Pending/ Implemented | Yes | [1] |  |  |  |
Contributions | 1,015,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = strl_CarpenterFundsAdministrativeOfficeMember |  | 759,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = strl_CarpenterFundsAdministrativeOfficeMember |  | 47,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = strl_CarpenterFundsAdministrativeOfficeMember |
Surcharge Imposed | No |  |  |  |  |
Expiration Date of Collective Bargaining Agreement | Jun. 30, 2019 | [3] |  |  |  |
Cement Mason Pension Trust Fund For Northern California [Member] |  |  |  |  |  |
Note 17 - Employee Benefit Plans (Details) - Participation in Multiemployer Defined Benefit Pension Plan [Line Items] |  |  |  |  |  |
Certified Zone Status | Yellow | [2] | Yellow | [2] |  |
FIP/RP Status Pending/ Implemented | Yes | [1] |  |  |  |
Contributions | 322,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = strl_CementMasonPensionTrustFundForNorthernCaliforniaMember |  | 517,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = strl_CementMasonPensionTrustFundForNorthernCaliforniaMember |  | 265,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = strl_CementMasonPensionTrustFundForNorthernCaliforniaMember |
Surcharge Imposed | No |  |  |  |  |
Expiration Date of Collective Bargaining Agreement | Jun. 30, 2016 | [3] |  |  |  |
All Other Funds [Member] |  |  |  |  |  |
Note 17 - Employee Benefit Plans (Details) - Participation in Multiemployer Defined Benefit Pension Plan [Line Items] |  |  |  |  |  |
Contributions | $ 6,267,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = strl_AllOtherFundsMember | [4] | $ 2,608,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = strl_AllOtherFundsMember | [4] | $ 4,290,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = strl_AllOtherFundsMember | [4]
[1] | Indicates whether the plan has a financial improvement plan ("FIP") or a rehabilitation plan ("RP") which is either pending or has been implemented.
[2] | The most recent PPA zone status available in 2014 and 2013 is for the plan's year-end during 2013 and 2012, respectively. The zone status is based on information that we received from the plan and is certified by the plan's actuary. Among other factors, plans in the red zone are generally less than 65 percent funded, plans in the orange zone are less than 80 percent funded and have an Accumulated Funding Deficiency in the current year or projected into the next six years, plans in the yellow zone are less than 80 percent funded, and plans in the green zone are at least 80 percent funded.
[3] | Lists the expiration date(s) of the collective-bargaining agreement(s) to which the plans are subject.
[4] | These funds include multiemployer plans for pensions and other employee benefits. The total individually insignificant multiemployer pension costs contributed were $903,000, $603,000 and $466,000 for 2014, 2013 and 2012, respectively, and are included in the contributions to all other funds along with contributions to other types of benefit plans. Other employee benefits include certain coverage for medical, prescription drug, dental, vision, life and accidental death and dismemberment, disability and other benefit costs.

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- Definition Describes pertinent information about the defined benefit plan that is not otherwise reflected in the taxonomy. + References No definition available. + Details
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- Definition Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition Indicate the multiemployer plan's certified zone status as currently required by the Pension Protection Act of 2006 or a subsequent amendment thereof. The zone status categories are red (critical status), orange (seriously endangered), yellow (endangered), and green (none of the above). The acceptable values are "red", "orange", "yellow", "green", "other", and "NA". A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition Expiration date of the collective bargaining arrangement requiring contributions to the multiemployer plan, in CCYY-MM-DD format. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition Indicate whether the employer paid a surcharge to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. The acceptable values are "no", "yes", and "NA". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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