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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net loss attributable to Sterling common stockholders $ (9,781)us-gaap_NetIncomeLoss $ (73,929)us-gaap_NetIncomeLoss $ (297)us-gaap_NetIncomeLoss
Plus: Noncontrolling owners’ interests in earnings of subsidiaries and joint ventures 4,556us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 3,903us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 18,009us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net (loss) income (5,225)us-gaap_IncomeLossIncludingPortionAttributableToNoncontrollingInterest (70,026)us-gaap_IncomeLossIncludingPortionAttributableToNoncontrollingInterest 17,712us-gaap_IncomeLossIncludingPortionAttributableToNoncontrollingInterest
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:      
Depreciation and amortization 18,348us-gaap_DepreciationDepletionAndAmortization 18,650us-gaap_DepreciationDepletionAndAmortization 18,997us-gaap_DepreciationDepletionAndAmortization
Gain on disposal of property and equipment (995)us-gaap_GainLossOnSaleOfPropertyPlantEquipment (1,837)us-gaap_GainLossOnSaleOfPropertyPlantEquipment (3,184)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Deferred tax expense (benefit)   5,150us-gaap_IncreaseDecreaseInDeferredIncomeTaxes (1,167)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Interest expense accreted on noncontrolling interests     993strl_InterestExpenseAccretedOnNoncontrollingInterest
Stock-based compensation expense 849us-gaap_ShareBasedCompensation 928us-gaap_ShareBasedCompensation 694us-gaap_ShareBasedCompensation
Gain on sale of securities   (91)us-gaap_GainLossOnSaleOfOtherInvestments (785)us-gaap_GainLossOnSaleOfOtherInvestments
Tax impact from exercise of stock options and restricted stock   15us-gaap_DeferredTaxExpenseFromStockOptionsExercised 79us-gaap_DeferredTaxExpenseFromStockOptionsExercised
Changes in operating assets and liabilities:      
Contracts receivable (1,651)us-gaap_IncreaseDecreaseInContractReceivablesNet (6,430)us-gaap_IncreaseDecreaseInContractReceivablesNet 4,060us-gaap_IncreaseDecreaseInContractReceivablesNet
Costs and estimated earnings in excess of billings on uncompleted contracts (21,719)us-gaap_IncreaseDecreaseInUnbilledReceivables 8,908us-gaap_IncreaseDecreaseInUnbilledReceivables (4,083)us-gaap_IncreaseDecreaseInUnbilledReceivables
Receivables from and equity in construction joint ventures (3,035)strl_IncreaseDecreaseInEquityInvestmentInUnconsolidatedJointVentures 4,887strl_IncreaseDecreaseInEquityInvestmentInUnconsolidatedJointVentures (4,948)strl_IncreaseDecreaseInEquityInvestmentInUnconsolidatedJointVentures
Income tax receivable 4,784us-gaap_IncreaseDecreaseInIncomeTaxesReceivable (6,011)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable  
Other current assets 2,480us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (6,722)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (9,234)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable 5,192us-gaap_IncreaseDecreaseInAccountsPayable 13,794us-gaap_IncreaseDecreaseInAccountsPayable 7,730us-gaap_IncreaseDecreaseInAccountsPayable
Billings in excess of costs and estimated earnings on uncompleted contracts (5,927)us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings 12,658us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings 335us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings
Accrued compensation and other liabilities (2,504)us-gaap_IncreaseDecreaseInAccruedLiabilities 4,055us-gaap_IncreaseDecreaseInAccruedLiabilities (2,410)us-gaap_IncreaseDecreaseInAccruedLiabilities
Member’s interest subject to mandatory redemption and undistributed earnings (1,110)strl_IncreaseDecreaseInMembersInterestSubjectToMandatoryRedemptionAndUndistributedEarnings    
Net cash (used in) provided by operating activities (10,513)us-gaap_NetCashProvidedByUsedInOperatingActivities (22,072)us-gaap_NetCashProvidedByUsedInOperatingActivities 24,789us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:      
Acquisition of noncontrolling interests     (23,144)us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries
Additions to property and equipment (13,509)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (14,390)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (37,359)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of property and equipment 6,078us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 6,787us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 12,464us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Purchases of short-term securities, available-for-sale   (1,638)us-gaap_PaymentsToAcquireAvailableForSaleSecurities (30,154)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Sales of short-term securities, available-for-sale   49,874us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 26,661us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Net cash (used in) provided by investing activities (7,431)us-gaap_NetCashProvidedByUsedInInvestingActivities 40,633us-gaap_NetCashProvidedByUsedInInvestingActivities (51,532)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:      
Cumulative daily drawdowns – Credit Facility 330,338us-gaap_ProceedsFromLinesOfCredit 219,026us-gaap_ProceedsFromLinesOfCredit 75,012us-gaap_ProceedsFromLinesOfCredit
Cumulative daily repayments – Credit Facility (303,545)us-gaap_RepaymentsOfLinesOfCredit (235,230)us-gaap_RepaymentsOfLinesOfCredit (51,000)us-gaap_RepaymentsOfLinesOfCredit
Distributions to noncontrolling interest owners (1,191)us-gaap_PaymentsToMinorityShareholders (3,565)us-gaap_PaymentsToMinorityShareholders (10,185)us-gaap_PaymentsToMinorityShareholders
Net proceeds from stock issued 14,046us-gaap_ProceedsFromIssuanceOfCommonStock    
Issuance of common stock pursuant to warrants and options exercised 12us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 26us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 68us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Tax impact from exercise of stock options   (15)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities (79)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Other (745)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (73)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (302)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash provided by (used in) financing activities 38,915us-gaap_NetCashProvidedByUsedInFinancingActivities (19,831)us-gaap_NetCashProvidedByUsedInFinancingActivities 13,514us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase (decrease) in cash and cash equivalents 20,971us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (1,270)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (13,229)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 1,872us-gaap_CashAndCashEquivalentsAtCarryingValue 3,142us-gaap_CashAndCashEquivalentsAtCarryingValue 16,371us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 22,843us-gaap_CashAndCashEquivalentsAtCarryingValue 1,872us-gaap_CashAndCashEquivalentsAtCarryingValue 3,142us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosures of cash flow information:      
Cash paid during the period for interest 1,075us-gaap_InterestPaid 595us-gaap_InterestPaid 88us-gaap_InterestPaid
Cash paid during the period for income taxes 1us-gaap_IncomeTaxesPaid 170us-gaap_IncomeTaxesPaid 2,990us-gaap_IncomeTaxesPaid
Non-cash items:      
Revaluation of noncontrolling interests   (7,686)strl_IncreaseDecreaseInRevaluationOfNoncontrollingInterestRLWPutcallLiabilityNetOfTax 3,992strl_IncreaseDecreaseInRevaluationOfNoncontrollingInterestRLWPutcallLiabilityNetOfTax
Issuance of noncontrolling interest in RHB in exchange for net assets of acquired companies     9,767us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1
Goodwill adjustments     410us-gaap_OtherNoncashIncomeExpense
Transportation and construction equipment acquired through financing arrangements $ 3,159us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1 $ 510us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1