Note 3 - Acquisitions (Detail) - Final Allocation of Purchase Price (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012
Customer Relationships [Member] | Preliminary Purchase Price Allocation [Member]
Intangible Assets	$ 38,190
Customer Relationships [Member] | Final Purchase Price Allocation [Member]
Intangible Assets	38,190
Trade Names [Member] | Preliminary Purchase Price Allocation [Member]
Intangible Assets	17,426
Trade Names [Member] | Final Purchase Price Allocation [Member]
Intangible Assets	17,426
Noncompete Agreements [Member] | Preliminary Purchase Price Allocation [Member]
Intangible Assets	511
Noncompete Agreements [Member] | Final Purchase Price Allocation [Member]
Intangible Assets	511
Unpatented Technology [Member] | Preliminary Purchase Price Allocation [Member]
Intangible Assets	762
Unpatented Technology [Member] | Final Purchase Price Allocation [Member]
Intangible Assets	762
Goodwill [Member] | Preliminary Purchase Price Allocation [Member]
Intangible Assets	159,988
Goodwill [Member] | Purchase Price Adjustments and Reclassifications [Member]
Intangible Assets	2,048
Goodwill [Member] | Final Purchase Price Allocation [Member]
Intangible Assets	162,036
Preliminary Purchase Price Allocation [Member]
Building, equipment and leasehold improvements	1,800
Net deferred tax liability associated with step-up in book basis	(18,244)
Assets acquired and liabilities assumed, net	14,581
Totals	215,014
Purchase Price Adjustments and Reclassifications [Member]
Net deferred tax liability associated with step-up in book basis	693
Assets acquired and liabilities assumed, net	(2,741)
Final Purchase Price Allocation [Member]
Building, equipment and leasehold improvements	1,800
Net deferred tax liability associated with step-up in book basis	(17,551)
Assets acquired and liabilities assumed, net	11,840
Totals	$ 215,014