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Note 3 - Variable Interest Entities (Detail) - Summary financial information of Myers included in the consolidated statements of operations: (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues	$ 630,507	$ 501,156	$ 459,893
Operating income	14,979	(52,234)	35,910
Variable Interest Entity, Primary Beneficiary [Member]
Revenues	84,877	7,153
Operating income	2,152	531
Net income (loss) attributable to Sterling common stockholders	$ 694	$ 170