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Note 20 - Quarterly Financial Information (Details) - Quarterly Financial Information (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information [Abstract]
Revenues	$ 153,611us-gaap_Revenues	$ 189,275us-gaap_Revenues	$ 194,806us-gaap_Revenues	$ 134,538us-gaap_Revenues	$ 125,916us-gaap_Revenues	$ 185,935us-gaap_Revenues	$ 133,350us-gaap_Revenues	$ 111,035us-gaap_Revenues	$ 672,230us-gaap_Revenues	$ 556,236us-gaap_Revenues	$ 630,507us-gaap_Revenues
Gross profit	3,697us-gaap_GrossProfit	8,356us-gaap_GrossProfit	12,499us-gaap_GrossProfit	7,869us-gaap_GrossProfit	(23,053)us-gaap_GrossProfit	8,359us-gaap_GrossProfit	(16,635)us-gaap_GrossProfit	1,385us-gaap_GrossProfit	32,421us-gaap_GrossProfit	(29,944)us-gaap_GrossProfit	47,472us-gaap_GrossProfit
Income (loss) before income taxes and earnings attributable to noncontrolling interests	(5,875)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(1,671)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2,473us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	480us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(37,333)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1,715us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(25,967)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(7,219)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(4,593)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(68,804)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Net income (loss) attributable to Sterling common stockholders	$ (7,251)us-gaap_NetIncomeLoss	$ (3,935)us-gaap_NetIncomeLoss	$ 1,200us-gaap_NetIncomeLoss	$ 205us-gaap_NetIncomeLoss	$ (52,135)us-gaap_NetIncomeLoss	$ (189)us-gaap_NetIncomeLoss	$ (17,025)us-gaap_NetIncomeLoss	$ (4,580)us-gaap_NetIncomeLoss	$ (9,781)us-gaap_NetIncomeLoss	$ (73,929)us-gaap_NetIncomeLoss	$ (297)us-gaap_NetIncomeLoss
Basic (in Dollars per share)	$ (0.39)us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic	$ (0.21)us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic	$ 0.07us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic	$ 0.01us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic	$ (3.52)us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic	$ (0.06)us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic	$ (0.93)us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic	$ (0.39)us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic	$ (0.54)us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic	$ (4.91)us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Diluted (in Dollars per share)	$ (0.39)us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted	$ (0.21)us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted	$ 0.07us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted	$ 0.01us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted	$ (3.52)us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted	$ (0.06)us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted	$ (0.93)us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted	$ (0.39)us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted	$ (0.54)us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted	$ (4.91)us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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