XML 102 R49.htm IDEA: XBRL DOCUMENT v2.4.1.9

Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended			1 Months Ended		0 Months Ended	3 Months Ended	36 Months Ended	1 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 31, 2011	Jan. 23, 2014	Aug. 01, 2011	Mar. 31, 2014	Dec. 31, 2012	Apr. 30, 2013	Sep. 30, 2013	Dec. 31, 2009	Apr. 27, 2012
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Adjustments to Additional Paid in Capital, Other			$ (116,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalOther
Related Party Transaction, Amounts of Transaction			400,000us-gaap_RelatedPartyTransactionAmountsOfTransaction	400,000us-gaap_RelatedPartyTransactionAmountsOfTransaction	400,000us-gaap_RelatedPartyTransactionAmountsOfTransaction
Liquidation Value Multiplier					4.5strl_LiquidationValueMultiplier
			3,200,000strl_MandatoryRedemptionEarningsDistributed
Obligation For Noncontrolling Owners Interest In Subsidiaries And Joint Ventures		196,000strl_ObligationForNoncontrollingOwnersInterestInSubsidiariesAndJointVentures		196,000strl_ObligationForNoncontrollingOwnersInterestInSubsidiariesAndJointVentures								17,800,000strl_ObligationForNoncontrollingOwnersInterestInSubsidiariesAndJointVentures
Redeemable Noncontrolling Interest, Equity, Fair Value												14,100,000us-gaap_RedeemableNoncontrollingInterestEquityFairValue
Undistributed Earnings of Domestic Subsidiaries		3,989,000us-gaap_UndistributedEarningsOfDomesticSubsidiaries	6,079,000us-gaap_UndistributedEarningsOfDomesticSubsidiaries	3,989,000us-gaap_UndistributedEarningsOfDomesticSubsidiaries								3,700,000us-gaap_UndistributedEarningsOfDomesticSubsidiaries
Increase in Undistributed Earnings		300,000strl_IncreaseInUndistributedEarnings
Sale of Ancillary Company Equity Percentage	50.00%strl_SaleOfAncillaryCompanyEquityPercentage
Net Income (Loss) Attributable to Noncontrolling Interest			4,556,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	3,903,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	18,009,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Payments to Noncontrolling Interests			1,191,000us-gaap_PaymentsToMinorityShareholders	3,565,000us-gaap_PaymentsToMinorityShareholders	10,185,000us-gaap_PaymentsToMinorityShareholders
Net Income Attributable To Noncontrolling Interest Included In Liabilities				2,024,000strl_NetIncomeAttributableToNoncontrollingInterestIncludedInLiabilities	16,941,000strl_NetIncomeAttributableToNoncontrollingInterestIncludedInLiabilities
Net Income Attributable To Noncontrolling Interest Included In Equity			4,556,000strl_NetIncomeAttributableToNoncontrollingInterestIncludedInEquity	1,879,000strl_NetIncomeAttributableToNoncontrollingInterestIncludedInEquity	1,068,000strl_NetIncomeAttributableToNoncontrollingInterestIncludedInEquity
Other Operating Income (Expense) [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Undistributed Earnings, Basic			2,100,000us-gaap_UndistributedEarnings / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherOperatingIncomeExpenseMember
RHB [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Business Acquisition Pre-Tax Adjustment					1,300,000strl_BusinessAcquisitionPreTaxAdjustment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = strl_RHBMember
Upon Death [Member] | CEO of RHB [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Obligation to Purchase Member Interest		20,000,000strl_ObligationToPurchaseMemberInterest / us-gaap_StatementScenarioAxis = strl_UponDeathMember / us-gaap_TitleOfIndividualAxis = strl_CEOOfRHBMember		20,000,000strl_ObligationToPurchaseMemberInterest / us-gaap_StatementScenarioAxis = strl_UponDeathMember / us-gaap_TitleOfIndividualAxis = strl_CEOOfRHBMember
Cash Surrender Value of Life Insurance		20,000,000us-gaap_CashSurrenderValueOfLifeInsurance / us-gaap_StatementScenarioAxis = strl_UponDeathMember / us-gaap_TitleOfIndividualAxis = strl_CEOOfRHBMember		20,000,000us-gaap_CashSurrenderValueOfLifeInsurance / us-gaap_StatementScenarioAxis = strl_UponDeathMember / us-gaap_TitleOfIndividualAxis = strl_CEOOfRHBMember
Upon Permanent Disability [Member] | CEO of RHB [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Obligation to Purchase Member Interest		18,000,000strl_ObligationToPurchaseMemberInterest / us-gaap_StatementScenarioAxis = strl_UponPermanentDisabilityMember / us-gaap_TitleOfIndividualAxis = strl_CEOOfRHBMember		18,000,000strl_ObligationToPurchaseMemberInterest / us-gaap_StatementScenarioAxis = strl_UponPermanentDisabilityMember / us-gaap_TitleOfIndividualAxis = strl_CEOOfRHBMember
Years 2011 to 2015 [Member] | JBC [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Business Acquisition Earn-Out Calculated Floor						2,000,000strl_BusinessAcquisitionEarnOutCalculatedFloor / us-gaap_BusinessAcquisitionAxis = strl_JBCMember / us-gaap_StatementScenarioAxis = strl_Years2011To2015Member
Seven Months Ended 2016 [Member] | JBC [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Business Acquisition Earn-Out Calculated Floor						1,200,000strl_BusinessAcquisitionEarnOutCalculatedFloor / us-gaap_BusinessAcquisitionAxis = strl_JBCMember / us-gaap_StatementScenarioAxis = strl_SevenMonthsEndedTwoThousandSixteenMember
Original Earn-out Liability [Member] | JBC [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Business Acquisition Undiscounted Earn-Out Liability							5,000,000strl_BusinessAcquisitionUndiscountedEarnOutLiability / us-gaap_BusinessAcquisitionAxis = strl_JBCMember / us-gaap_StatementScenarioAxis = strl_OriginalEarnoutLiabilityMember
If certain EBITDA thresholds are met [Member] | JBC [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Business Acquisition Undiscounted Earn-Out Liability							10,000,000strl_BusinessAcquisitionUndiscountedEarnOutLiability / us-gaap_BusinessAcquisitionAxis = strl_JBCMember / us-gaap_StatementScenarioAxis = strl_IfCertainEBITDAThresholdsAreMetMember
For 2014 and 2015 [Member] | JBC [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Business Acquisition Earn-Out Calculated Floor							1,500,000strl_BusinessAcquisitionEarnOutCalculatedFloor / us-gaap_BusinessAcquisitionAxis = strl_JBCMember / us-gaap_StatementScenarioAxis = strl_ForTwoThousandFourteenAndTwoThousandFifteenMember
For 2016 and 2017 [Member] | JBC [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Business Acquisition Earn-Out Calculated Floor							2,000,000strl_BusinessAcquisitionEarnOutCalculatedFloor / us-gaap_BusinessAcquisitionAxis = strl_JBCMember / us-gaap_StatementScenarioAxis = strl_ForTwoThousandSixteenAndTwoThousandSeventeenMember
For the Years 2015 Through 2017 [Member] | JBC [Member] | Minimum [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Forcasted EBITDA Percentage							0.00%strl_ForcastedEBITDAPercentage / us-gaap_BusinessAcquisitionAxis = strl_JBCMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementScenarioAxis = strl_ForTheYears2015Through2017Member
For the Years 2015 Through 2017 [Member] | JBC [Member] | Maximum [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Forcasted EBITDA Percentage							22.40%strl_ForcastedEBITDAPercentage / us-gaap_BusinessAcquisitionAxis = strl_JBCMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementScenarioAxis = strl_ForTheYears2015Through2017Member
RHBP [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net					9,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = strl_RHBPMember					9,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = strl_RHBPMember
Adjustments to Additional Paid in Capital, Other					233,000us-gaap_AdjustmentsToAdditionalPaidInCapitalOther / us-gaap_BusinessAcquisitionAxis = strl_RHBPMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent					360,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = strl_RHBPMember					360,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = strl_RHBPMember
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual					152,000us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = strl_RHBPMember
Net Income (Loss) Attributable to Noncontrolling Interest					1,900,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = strl_RHBPMember
Contracts Assumed [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual					26,100,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = strl_ContractsAssumedMember
JBC [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Business Acquisition Additional Price Payments Term						5 years
Business Acquisition Additional Price Payments						5,000,000strl_BusinessAcquisitionAdditionalPricePayments / us-gaap_BusinessAcquisitionAxis = strl_JBCMember
Business Acquisition Earn-Out Percentage						50.00%strl_BusinessAcquisitionEarnOutPercentage / us-gaap_BusinessAcquisitionAxis = strl_JBCMember
Business Acquisition Discounted Earn-Out Liability		600,000strl_BusinessAcquisitionDiscountedEarnOutLiability / us-gaap_BusinessAcquisitionAxis = strl_JBCMember		600,000strl_BusinessAcquisitionDiscountedEarnOutLiability / us-gaap_BusinessAcquisitionAxis = strl_JBCMember
Business Acquisition Undiscounted Earn-Out Liability		1,400,000strl_BusinessAcquisitionUndiscountedEarnOutLiability / us-gaap_BusinessAcquisitionAxis = strl_JBCMember	300,000strl_BusinessAcquisitionUndiscountedEarnOutLiability / us-gaap_BusinessAcquisitionAxis = strl_JBCMember	1,400,000strl_BusinessAcquisitionUndiscountedEarnOutLiability / us-gaap_BusinessAcquisitionAxis = strl_JBCMember
Payment for Amendment to the Earn-out Liability									800,000strl_PaymentforAmendmenttotheEarnoutLiability / us-gaap_BusinessAcquisitionAxis = strl_JBCMember
Business Acquisition, Cost of Acquired Entity, Discounted Present Value of Additional Purchase Price			300,000strl_BusinessAcquisitionCostOfAcquiredEntityDiscountedPresentValueOfAdditionalPurchasePrice / us-gaap_BusinessAcquisitionAxis = strl_JBCMember					2,400,000strl_BusinessAcquisitionCostOfAcquiredEntityDiscountedPresentValueOfAdditionalPurchasePrice / us-gaap_BusinessAcquisitionAxis = strl_JBCMember
Business Acquisition Undiscounted Earn-Out Liability Increase			9,000,000strl_BusinessAcquisitionUndiscountedEarnOutLiabilityIncrease / us-gaap_BusinessAcquisitionAxis = strl_JBCMember
EBITDA Earn-Out Increase Floor			18,000,000strl_EBITDAEarnOutIncreaseFloor / us-gaap_BusinessAcquisitionAxis = strl_JBCMember
Interest Expense			300,000us-gaap_InterestExpense / us-gaap_BusinessAcquisitionAxis = strl_JBCMember	100,000us-gaap_InterestExpense / us-gaap_BusinessAcquisitionAxis = strl_JBCMember	100,000us-gaap_InterestExpense / us-gaap_BusinessAcquisitionAxis = strl_JBCMember
RLW [Member] | Minimum [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Business Acquisition Purchase Price Multiplier										4strl_BusinessAcquisitionPurchasePriceMultiplier / us-gaap_BusinessAcquisitionAxis = strl_RLWMember / us-gaap_RangeAxis = us-gaap_MinimumMember
RLW [Member] | Maximum [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Business Acquisition Purchase Price Multiplier										4.5strl_BusinessAcquisitionPurchasePriceMultiplier / us-gaap_BusinessAcquisitionAxis = strl_RLWMember / us-gaap_RangeAxis = us-gaap_MaximumMember
RLW [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Business Acquisition Additional Price Payments					23,100,000strl_BusinessAcquisitionAdditionalPricePayments / us-gaap_BusinessAcquisitionAxis = strl_RLWMember						509,000strl_BusinessAcquisitionAdditionalPricePayments / us-gaap_BusinessAcquisitionAxis = strl_RLWMember
Business Acquisition Remaining Percentage Of Voting Interests				20.00%strl_BusinessAcquisitionRemainingPercentageOfVotingInterests / us-gaap_BusinessAcquisitionAxis = strl_RLWMember
Business Acquisition Purchase Price Percentage										20.00%strl_BusinessAcquisitionPurchasePricePercentage / us-gaap_BusinessAcquisitionAxis = strl_RLWMember
Derivative, Basis Spread on Variable Rate													2.00%us-gaap_DerivativeBasisSpreadOnVariableRate / us-gaap_BusinessAcquisitionAxis = strl_RLWMember
Accretion Expense					1,000,000us-gaap_AccretionExpense / us-gaap_BusinessAcquisitionAxis = strl_RLWMember
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners					20.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_BusinessAcquisitionAxis = strl_RLWMember					20.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_BusinessAcquisitionAxis = strl_RLWMember
Business Acquisition, Payments of Undistributed Earnings											2,300,000strl_BusinessAcquisitionPaymentsOfUndistributedEarnings / us-gaap_BusinessAcquisitionAxis = strl_RLWMember
Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest					6,700,000us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity / us-gaap_BusinessAcquisitionAxis = strl_RLWMember
Increase (Decrease) in Income Taxes					2,400,000us-gaap_IncreaseDecreaseInIncomeTaxes / us-gaap_BusinessAcquisitionAxis = strl_RLWMember
Net Income (Loss) Attributable to Noncontrolling Interest					15,000,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = strl_RLWMember
Myers [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Net Income (Loss) Attributable to Noncontrolling Interest					1,100,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = strl_MyersMember
CEO of RHB [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Adjustment to Member's Interest		5,900,000strl_AdjustmentToMembersInterest / us-gaap_TitleOfIndividualAxis = strl_CEOOfRHBMember
Current obligations for noncontrolling owners [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Net Income Attributable To Noncontrolling Interest Included In Liabilities				100,000strl_NetIncomeAttributableToNoncontrollingInterestIncludedInLiabilities / us-gaap_BalanceSheetLocationAxis = strl_CurrentObligationsForNoncontrollingOwnersMember
Member’s interest subject to mandatory redemption [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Net Income Attributable To Noncontrolling Interest Included In Liabilities				2,100,000strl_NetIncomeAttributableToNoncontrollingInterestIncludedInLiabilities / us-gaap_BalanceSheetLocationAxis = strl_MembersInterestSubjectToMandatoryRedemptionMember
RHB [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent														50.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = strl_RHBMember
Related Party Transaction, Amounts of Transaction					5,000,000us-gaap_RelatedPartyTransactionAmountsOfTransaction / dei_LegalEntityAxis = strl_RHBMember
Noncontrolling Interests Offer To Buy Percentage					50.00%strl_NoncontrollingInterestsOfferToBuyPercentage / dei_LegalEntityAxis = strl_RHBMember
Noncontrolling Interests Offer To Sell Percentage					50.00%strl_NoncontrollingInterestsOfferToSellPercentage / dei_LegalEntityAxis = strl_RHBMember
Revaluation Pre-Tax Charge				1,900,000strl_RevaluationPreTaxCharge / dei_LegalEntityAxis = strl_RHBMember	2,500,000strl_RevaluationPreTaxCharge / dei_LegalEntityAxis = strl_RHBMember
RLW [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Increase (Decrease) in Put/Call Liability					3,800,000strl_IncreaseDecreaseInPut_CallLiability / dei_LegalEntityAxis = strl_RLWMember
SWR, Inc. [Member[
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) [Line Items]
Number of Assumed Construction Contracts					6strl_NumberOfAssumedConstructionContracts / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = strl_SWRIncMember
Deferred Revenue					$ 25,000,000us-gaap_DeferredRevenue / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = strl_SWRIncMember					25,000,000us-gaap_DeferredRevenue / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = strl_SWRIncMember

X

- Definition

Adjustment to Member's Interest

+ References

No definition available.

+ Details

Name:	strl_AdjustmentToMembersInterest
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Business Acquisition Additional Price Payments.

+ References

No definition available.

+ Details

Name:	strl_BusinessAcquisitionAdditionalPricePayments
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Business Acquisition Additional Price Payments Term.

+ References

No definition available.

+ Details

Name:	strl_BusinessAcquisitionAdditionalPricePaymentsTerm
Namespace Prefix:	strl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Business Acquisition, Cost of Acquired Entity, Discounted Present Value of Additional Purchase Price

+ References

No definition available.

+ Details

Name:	strl_BusinessAcquisitionCostOfAcquiredEntityDiscountedPresentValueOfAdditionalPurchasePrice
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the business acquisition discounted earn-out liability.

+ References

No definition available.

+ Details

Name:	strl_BusinessAcquisitionDiscountedEarnOutLiability
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Business Acquisition Earn-Out Calculated Floor.

+ References

No definition available.

+ Details

Name:	strl_BusinessAcquisitionEarnOutCalculatedFloor
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Business Acuisition Earn-Out Percentage

+ References

No definition available.

+ Details

Name:	strl_BusinessAcquisitionEarnOutPercentage
Namespace Prefix:	strl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Business Acquisition, Payments of Undistributed Earnings

+ References

No definition available.

+ Details

Name:	strl_BusinessAcquisitionPaymentsOfUndistributedEarnings
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Business Acquisition Pre-Tax Adjustment

+ References

No definition available.

+ Details

Name:	strl_BusinessAcquisitionPreTaxAdjustment
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Business Acquisition Purchase Price Multiplier.

+ References

No definition available.

+ Details

Name:	strl_BusinessAcquisitionPurchasePriceMultiplier
Namespace Prefix:	strl_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Business Acquisition Purchase Price Percentage

+ References

No definition available.

+ Details

Name:	strl_BusinessAcquisitionPurchasePricePercentage
Namespace Prefix:	strl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Business Acquisition Remaining Percentage Of Voting Interests

+ References

No definition available.

+ Details

Name:	strl_BusinessAcquisitionRemainingPercentageOfVotingInterests
Namespace Prefix:	strl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Business Acquisition Un-discounted Earn-Out Liability.

+ References

No definition available.

+ Details

Name:	strl_BusinessAcquisitionUndiscountedEarnOutLiability
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Business Acquisition Undiscounted Earn-Out Liability Increase

+ References

No definition available.

+ Details

Name:	strl_BusinessAcquisitionUndiscountedEarnOutLiabilityIncrease
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

EBITDA Earn-Out Increase Floor

+ References

No definition available.

+ Details

Name:	strl_EBITDAEarnOutIncreaseFloor
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Forcasted EBITDA Percentage.

+ References

No definition available.

+ Details

Name:	strl_ForcastedEBITDAPercentage
Namespace Prefix:	strl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Increase (Decrease) in Put/Call Liability

+ References

No definition available.

+ Details

Name:	strl_IncreaseDecreaseInPut_CallLiability
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Increase in Undistributed Earnings

+ References

No definition available.

+ Details

Name:	strl_IncreaseInUndistributedEarnings
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Liquidation value multiplier.

+ References

No definition available.

+ Details

Name:	strl_LiquidationValueMultiplier
Namespace Prefix:	strl_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the mandatory earnings distribution to non-controlling interest.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of net income or loss for the period allocated to the noncontrolling interest included in equity in order to derive to the portion attributable to the parent.

+ References

No definition available.

+ Details

Name:	strl_NetIncomeAttributableToNoncontrollingInterestIncludedInEquity
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of net income or loss for the period allocated to the noncontrolling interest included in liabilities in order to derive to the portion attributable to the parent.

+ References

No definition available.

+ Details

Name:	strl_NetIncomeAttributableToNoncontrollingInterestIncludedInLiabilities
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Noncontrolling interests offer to buy percentage.

+ References

No definition available.

+ Details

Name:	strl_NoncontrollingInterestsOfferToBuyPercentage
Namespace Prefix:	strl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Noncontrolling interests offer to sell percentage.

+ References

No definition available.

+ Details

Name:	strl_NoncontrollingInterestsOfferToSellPercentage
Namespace Prefix:	strl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	strl_Note2AcquisitionsandSubsidiariesandJointVentureswithNoncontrollingOwnersInterestsDetailsLineItems
Namespace Prefix:	strl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of Assumed Construction Contracts

+ References

No definition available.

+ Details

Name:	strl_NumberOfAssumedConstructionContracts
Namespace Prefix:	strl_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Long-term liability for noncontrolling owners' interests in subsidiaries and joint ventures, including rights to put remaining ownership interest to the company.

+ References

No definition available.

+ Details

Name:	strl_ObligationForNoncontrollingOwnersInterestInSubsidiariesAndJointVentures
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Obligation to Purchase Member Interest

+ References

No definition available.

+ Details

Name:	strl_ObligationToPurchaseMemberInterest
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the payment for the amendment to the earn-out liability.

+ References

No definition available.

+ Details

Name:	strl_PaymentforAmendmenttotheEarnoutLiability
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Revaluation pre-tax charge.

+ References

No definition available.

+ Details

Name:	strl_RevaluationPreTaxCharge
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the percentage of an ancillary company that has been sold.

+ References

No definition available.

+ Details

Name:	strl_SaleOfAncillaryCompanyEquityPercentage
Namespace Prefix:	strl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 35

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6394232&loc=d3e17558-110866

+ Details

Name:	us-gaap_AccretionExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of other increase (decrease) in additional paid in capital (APIC).

+ References

No definition available.

+ Details

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

X

- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ 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 (h)(1)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

+ Details

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

X

- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ 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 (h)(1)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

+ Details

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

X

- Definition

Amount of deferred tax liability attributable to taxable temporary differences due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 55

-Paragraph 37

-URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 4

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765

+ Details

Name:	us-gaap_CashSurrenderValueOfLifeInsurance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 13

-Section A



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)

-URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780

+ Details

Name:	us-gaap_DeferredRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of income (loss) from continuing operations attributable to the noncontrolling interest. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 19

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4568447-111683

+ Details

Name:	us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes, and in deferred and other tax liabilities and assets.

+ References

No definition available.

+ Details

Name:	us-gaap_IncreaseDecreaseInIncomeTaxes
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.9)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 9

-Article 9

+ Details

Name:	us-gaap_InterestExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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

X

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of Net Income (Loss) attributable to noncontrolling interest.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4J

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

+ Details

Name:	us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

+ Details

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

X

- Definition

The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

-SubTopic 10

-Section S99

-Paragraph 3A

-Subparagraph 14

-URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

-SubTopic 10

-Section S99

-Paragraph 3A

-Subparagraph (16)(c)

-URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

-SubTopic 10

-Section S99

-Paragraph 3A

-Subparagraph 15

-URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

-SubTopic 10

-Section S99

-Paragraph 3A

-Subparagraph (12)(c)

-URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764

+ Details

Name:	us-gaap_RedeemableNoncontrollingInterestEquityFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of transactions with related party during the financial reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

Name:	us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 60B

-URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780133-109256



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 60A

-URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780132-109256



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 60

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2740-109256



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 66

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2814-109256



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 65

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2793-109256

+ Details

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

X

- 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

Name:	us-gaap_UndistributedEarningsOfDomesticSubsidiaries
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	dei_LegalEntityAxis=strl_RHBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=strl_RLWMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=strl_SWRIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=strl_CurrentObligationsForNoncontrollingOwnersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=strl_MembersInterestSubjectToMandatoryRedemptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=strl_ContractsAssumedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=strl_JBCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=strl_RHBPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=strl_RLWMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_OtherOperatingIncomeExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_StatementScenarioAxis=strl_ForTheYears2015Through2017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

Name:	us-gaap_StatementScenarioAxis=strl_SevenMonthsEndedTwoThousandSixteenMember
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_StatementScenarioAxis=strl_UponPermanentDisabilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementScenarioAxis=strl_Years2011To2015Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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