Note 3 - Acquisitions (Detail) - Final Allocation of Purchase Price (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012 Preliminary Purchase Price Allocation [Member] MES Group [Member] Customer Relationships [Member]	Jun. 30, 2012 Preliminary Purchase Price Allocation [Member] MES Group [Member] Trade Names [Member]	Jun. 30, 2012 Preliminary Purchase Price Allocation [Member] MES Group [Member] Noncompete Agreements [Member]	Jun. 30, 2012 Preliminary Purchase Price Allocation [Member] MES Group [Member] Unpatented Technology [Member]	Jun. 30, 2012 Preliminary Purchase Price Allocation [Member] MES Group [Member] Goodwill [Member]	Jun. 30, 2012 Preliminary Purchase Price Allocation [Member] MES Group [Member]	Jun. 30, 2012 Preliminary Purchase Price Allocation [Member] Premex Group [Member] Customer Relationships [Member]	Jun. 30, 2012 Preliminary Purchase Price Allocation [Member] Premex Group [Member] Trade Names [Member]	Jun. 30, 2012 Preliminary Purchase Price Allocation [Member] Premex Group [Member] Noncompete Agreements [Member]	Jun. 30, 2012 Preliminary Purchase Price Allocation [Member] Premex Group [Member] Unpatented Technology [Member]	Jun. 30, 2012 Preliminary Purchase Price Allocation [Member] Premex Group [Member] Goodwill [Member]	Jun. 30, 2012 Preliminary Purchase Price Allocation [Member] Premex Group [Member]	Jun. 30, 2012 Preliminary Purchase Price Allocation [Member] Other 2011 Acquisitions [Member] Customer Relationships [Member]	Jun. 30, 2012 Preliminary Purchase Price Allocation [Member] Other 2011 Acquisitions [Member] Trade Names [Member]	Jun. 30, 2012 Preliminary Purchase Price Allocation [Member] Other 2011 Acquisitions [Member] Noncompete Agreements [Member]	Jun. 30, 2012 Preliminary Purchase Price Allocation [Member] Other 2011 Acquisitions [Member] Unpatented Technology [Member]	Jun. 30, 2012 Preliminary Purchase Price Allocation [Member] Other 2011 Acquisitions [Member] Goodwill [Member]	Jun. 30, 2012 Preliminary Purchase Price Allocation [Member] Other 2011 Acquisitions [Member]	Jun. 30, 2012 Purchase Price Adjustments and Reclassifications [Member] MES Group [Member] Goodwill [Member]	Jun. 30, 2012 Purchase Price Adjustments and Reclassifications [Member] MES Group [Member]	Jun. 30, 2012 Purchase Price Adjustments and Reclassifications [Member] Premex Group [Member] Goodwill [Member]	Jun. 30, 2012 Purchase Price Adjustments and Reclassifications [Member] Premex Group [Member]	Jun. 30, 2012 Purchase Price Adjustments and Reclassifications [Member] Other 2011 Acquisitions [Member] Goodwill [Member]	Jun. 30, 2012 Purchase Price Adjustments and Reclassifications [Member] Other 2011 Acquisitions [Member]	Jun. 30, 2012 Final Purchase Price Allocation [Member] MES Group [Member] Customer Relationships [Member]	Jun. 30, 2012 Final Purchase Price Allocation [Member] MES Group [Member] Trade Names [Member]	Jun. 30, 2012 Final Purchase Price Allocation [Member] MES Group [Member] Noncompete Agreements [Member]	Jun. 30, 2012 Final Purchase Price Allocation [Member] MES Group [Member] Unpatented Technology [Member]	Jun. 30, 2012 Final Purchase Price Allocation [Member] MES Group [Member] Goodwill [Member]	Jun. 30, 2012 Final Purchase Price Allocation [Member] MES Group [Member]	Jun. 30, 2012 Final Purchase Price Allocation [Member] Premex Group [Member] Customer Relationships [Member]	Jun. 30, 2012 Final Purchase Price Allocation [Member] Premex Group [Member] Trade Names [Member]	Jun. 30, 2012 Final Purchase Price Allocation [Member] Premex Group [Member] Noncompete Agreements [Member]	Jun. 30, 2012 Final Purchase Price Allocation [Member] Premex Group [Member] Unpatented Technology [Member]	Jun. 30, 2012 Final Purchase Price Allocation [Member] Premex Group [Member] Goodwill [Member]	Jun. 30, 2012 Final Purchase Price Allocation [Member] Premex Group [Member]	Jun. 30, 2012 Final Purchase Price Allocation [Member] Other 2011 Acquisitions [Member] Customer Relationships [Member]	Jun. 30, 2012 Final Purchase Price Allocation [Member] Other 2011 Acquisitions [Member] Trade Names [Member]	Jun. 30, 2012 Final Purchase Price Allocation [Member] Other 2011 Acquisitions [Member] Noncompete Agreements [Member]	Jun. 30, 2012 Final Purchase Price Allocation [Member] Other 2011 Acquisitions [Member] Unpatented Technology [Member]	Jun. 30, 2012 Final Purchase Price Allocation [Member] Other 2011 Acquisitions [Member] Goodwill [Member]	Jun. 30, 2012 Final Purchase Price Allocation [Member] Other 2011 Acquisitions [Member]	Dec. 31, 2011 MES Group [Member]	Dec. 31, 2011 Premex Group [Member]	Dec. 31, 2011 Other 2011 Acquisitions [Member]
Building, equipment and leasehold improvements						$ 1,800						$ 650						$ 213												$ 1,800						$ 650						$ 213
Intangible Assets	38,190	17,426	511	762	159,988		32,886	10,602	109	2,356	28,131		18,577	2,989	197	334	21,500		2,048		3,686		(1,678)		38,190	17,426	511	762	162,036		32,886	10,602	109	2,356	31,817		18,577	2,989	197	334	19,822
Net deferred tax asset (liability) associated with step-up in book basis						(18,244)						603						(356)		693		(3,695)		50						(17,551)						(3,092)						(306)
Assets acquired and liabilities assumed, net						14,581						33,019						2,598		(2,741)		9		129						11,840						33,028						2,727
Totals						$ 215,014						$ 108,356						$ 46,052						$ (1,499)						$ 215,014						$ 108,356						$ 44,553	$ 215,000	$ 108,400	$ 44,600