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Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues	$ 117,682us-gaap_Revenues	$ 134,538us-gaap_Revenues
Cost of revenues	(124,518)us-gaap_CostOfGoodsSold	(126,669)us-gaap_CostOfGoodsSold
Gross (loss) profit	(6,836)us-gaap_GrossProfit	7,869us-gaap_GrossProfit
General and administrative expenses	(11,603)us-gaap_GeneralAndAdministrativeExpense	(8,484)us-gaap_GeneralAndAdministrativeExpense
Other operating income, net	1,761us-gaap_OtherOperatingIncomeExpenseNet	1,056us-gaap_OtherOperatingIncomeExpenseNet
Operating (loss) income	(16,678)us-gaap_OperatingIncomeLoss	441us-gaap_OperatingIncomeLoss
Interest income	363us-gaap_InterestIncomeOther	358us-gaap_InterestIncomeOther
Interest expense	(382)strl_InterestExpenseAndAccretedInterest	(319)strl_InterestExpenseAndAccretedInterest
(Loss) income before income taxes and earnings attributable to noncontrolling owners’ interests	(16,697)strl_IncomeBeforeIncomeTaxesAndEarningsAttributableToNoncontrollingInterests	480strl_IncomeBeforeIncomeTaxesAndEarningsAttributableToNoncontrollingInterests
Income tax expense	(3)us-gaap_IncomeTaxExpenseBenefit
Net (loss) income	(16,700)us-gaap_ProfitLoss	480us-gaap_ProfitLoss
Noncontrolling owners’ interests in earnings of subsidiaries	(292)us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable	(275)us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable
Net (loss) income attributable to Sterling common stockholders	$ (16,992)us-gaap_NetIncomeLoss	$ 205us-gaap_NetIncomeLoss
Net (loss) earnings per share attributable to Sterling common stockholders:
Basic (in Dollars per share)	$ (0.90)us-gaap_EarningsPerShareBasic	$ 0.01us-gaap_EarningsPerShareBasic
Diluted (in Dollars per share)	$ (0.90)us-gaap_EarningsPerShareDiluted	$ 0.01us-gaap_EarningsPerShareDiluted
Weighted average number of common shares outstanding used in computing per share amounts:
Basic (in Shares)	18,901,739us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	16,667,939us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in Shares)	18,901,739us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	16,855,173us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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