Note 1 - Description of Business (Detail) - Business Acquisitions - Proforma Information (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Revenues	$ 1,031,709		$ 990,241
Net income(1)	$ 54,023	[1]	$ 31,701	[1]

[1] Includes pro-forma adjustments for purchase price depreciation and amortization as if those intangibles were recorded as of January 1, of the year preceding the respective acquisition date.