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Consolidated Statements of Comprehensive Income (Loss) (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
Net income attributable to noncontrolling interest included in equity	4,556strl_NetIncomeAttributableToNoncontrollingInterestIncludedInEquity	1,879strl_NetIncomeAttributableToNoncontrollingInterestIncludedInEquity	1,068strl_NetIncomeAttributableToNoncontrollingInterestIncludedInEquity
Net income attributable to noncontrolling interest included in liabilities		2,024strl_NetIncomeAttributableToNoncontrollingInterestIncludedInLiabilities	16,941strl_NetIncomeAttributableToNoncontrollingInterestIncludedInLiabilities
Add /(deduct) other comprehensive income, net of tax:
Realized gain from available-for-sale securities		(90)us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet	(510)us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Change in unrealized holding gain (loss) on available-for-sale securities		(601)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	560us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Realized (gain) loss from settlement of derivatives	137us-gaap_GainLossOnSaleOfDerivatives	(48)us-gaap_GainLossOnSaleOfDerivatives	43us-gaap_GainLossOnSaleOfDerivatives
Change in the effective portion of unrealized (loss) gain in fair market value of derivatives	(355)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	160us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	107us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Comprehensive (loss) income	$ (5,443)us-gaap_ComprehensiveIncomeNetOfTax	$ (70,605)us-gaap_ComprehensiveIncomeNetOfTax	$ 17,912us-gaap_ComprehensiveIncomeNetOfTax

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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.

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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.

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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