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Consolidated Statement of Stockholders' Equity (USD $) | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Noncontrolling Interest [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 163,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 196,143,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 16,509,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 496,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 1,527,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ 214,838,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in Shares) at Dec. 31, 2011 | 16,321,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Net income (loss) |  |  | (297,000)strl_NetIncomeLossIncludingPortionAttributableToNoncontrollingInterest1 / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 1,068,000 strl_NetIncomeLossIncludingPortionAttributableToNoncontrollingInterest1 / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 771,000 strl_NetIncomeLossIncludingPortionAttributableToNoncontrollingInterest1
Other comprehensive income (loss) |  |  |  | 200,000 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 200,000 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Stock issued upon option and warrant exercises |  | 66,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 66,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Stock issued upon option and warrant exercises (in Shares) | 24,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Excess tax benefits from exercise of stock options |  | (79,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (79,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
Issuance and amortization of restricted stock | 2,000 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 694,000 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 696,000 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross
Issuance and amortization of restricted stock (in Shares) | 150,000 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Revaluation of noncontrolling interest RHB put/call liability |  | 243,000 strl_AdjustmentsToAdditionalPaidInCapitalRevaluationOfNoncontrollingInterestPutCallLiability / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (3,992,000)strl_AdjustmentsToAdditionalPaidInCapitalRevaluationOfNoncontrollingInterestPutCallLiability / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (40,000)strl_AdjustmentsToAdditionalPaidInCapitalRevaluationOfNoncontrollingInterestPutCallLiability / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (3,789,000)strl_AdjustmentsToAdditionalPaidInCapitalRevaluationOfNoncontrollingInterestPutCallLiability
Distribution to owners |  |  |  |  | (117,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (117,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Balance at Dec. 31, 2012 | 165,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 197,067,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 12,220,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 696,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 2,438,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 212,586,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in Shares) at Dec. 31, 2012 | 16,495,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Net income (loss) |  |  | (73,929,000)strl_NetIncomeLossIncludingPortionAttributableToNoncontrollingInterest1 / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 1,879,000 strl_NetIncomeLossIncludingPortionAttributableToNoncontrollingInterest1 / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (72,050,000)strl_NetIncomeLossIncludingPortionAttributableToNoncontrollingInterest1
Other comprehensive income (loss) |  |  |  | (579,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | (579,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Stock issued upon option and warrant exercises |  | 26,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 26,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Stock issued upon option and warrant exercises (in Shares) | 9,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Excess tax benefits from exercise of stock options |  | (15,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (15,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
Issuance and amortization of restricted stock | 2,000 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 926,000 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 928,000 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross
Issuance and amortization of restricted stock (in Shares) | 154,000 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Revaluation of noncontrolling interest RHB put/call liability |  | (7,078,000)strl_AdjustmentsToAdditionalPaidInCapitalRevaluationOfNoncontrollingInterestPutCallLiability / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (608,000)strl_AdjustmentsToAdditionalPaidInCapitalRevaluationOfNoncontrollingInterestPutCallLiability / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (7,686,000)strl_AdjustmentsToAdditionalPaidInCapitalRevaluationOfNoncontrollingInterestPutCallLiability
Distribution to owners |  |  |  |  | (416,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (416,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Balance at Dec. 31, 2013 | 167,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 190,926,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (62,317,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 117,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 3,901,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 132,794,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in Shares) at Dec. 31, 2013 | 16,658,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Net income (loss) |  |  | (9,781,000)strl_NetIncomeLossIncludingPortionAttributableToNoncontrollingInterest1 / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 4,556,000 strl_NetIncomeLossIncludingPortionAttributableToNoncontrollingInterest1 / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (5,225,000)strl_NetIncomeLossIncludingPortionAttributableToNoncontrollingInterest1
Other comprehensive income (loss) |  |  |  | (218,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | (218,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Stock issued upon option and warrant exercises |  | 12,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 12,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Stock issued upon option and warrant exercises (in Shares) | 4,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issuance and amortization of restricted stock |  | 849,000 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 849,000 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross
Issuance and amortization of restricted stock (in Shares) | 41,000 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Distribution to owners |  |  |  |  | (994,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (994,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Stock issued in equity offering, net of expense | 21,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 14,025,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 14,046,000 us-gaap_StockIssuedDuringPeriodValueNewIssues
Stock issued in equity offering, net of expense (in Shares) | 2,100,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Other |  | (115,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (1,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalOther / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (116,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalOther
Balance at Dec. 31, 2014 | $ 188,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 205,697,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (72,098,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (101,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 7,462,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ 141,148,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in Shares) at Dec. 31, 2014 | 18,803,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |

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