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Note 6 - Construction Joint Ventures (Detail) - Summary of noncontrolling venture partner share: (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Total combined:
Current assets	$ 164,758	$ 164,023
Less current liabilities	(77,274)	(69,285)
Sterling’s receivables from and equity in net assets of construction joint ventures	11,005	6,057
Corporate Joint Venture [Member]
Total combined:
Current assets	92,102	108,458
Less current liabilities	(48,002)	(86,023)
Net assets	44,100	22,435
Backlog	213,924	539,844
Sterling’s noncontrolling interest in backlog	77,222	127,130
Sterling’s receivables from and equity in net assets of construction joint ventures	$ 11,005	$ 6,057