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Note 10 - Variable Interest Entities (Detail) - Summary financial information of Myers included in the consolidated statements of operations: (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Revenues $ 205,283 $ 159,427 $ 472,418 $ 387,167
Operating income 4,171 7,761 7,850 16,736
Net income attributable to Sterling common stockholders 990 3,461 (3,223) 7,716
Variable Interest Entity, Primary Beneficiary [Member]
        
Revenues 39,972   63,542 3,515
Operating income 1,917   2,519 162
Net income attributable to Sterling common stockholders $ 621   $ 813 $ 52