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Note 6 - Construction Joint Ventures (Detail) - Summary of noncontrolling venture partner income: (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Total combined:
Revenues	$ 630,507	$ 501,156	$ 459,893
Income before tax	17,133	(51,716)
Corporate Joint Venture [Member]
Total combined:
Revenues	438,756	440,085	302,289
Income before tax	95,765	46,683	24,573
Sterling’s noncontrolling interest:
Share of revenues	82,519	62,763	37,684
Share of income before tax	$ 12,424	$ 6,417	$ 3,018