Note 5 - Goodwill and Intangible Assets (Details) - Intangible Assets - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Amortizable intangible assets:
Gross carrying amount	$ 350,733	$ 328,424
Accumulated amortization	(266,060)	(225,841)
Net carrying value	84,673	102,583
Customer Relationships [Member]
Amortizable intangible assets:
Gross carrying amount	263,293	244,211
Accumulated amortization	(199,266)	(167,943)
Net carrying value	64,027	76,268
Trade Names [Member]
Amortizable intangible assets:
Gross carrying amount	68,172	68,264
Accumulated amortization	(52,354)	(45,901)
Net carrying value	$ 15,818	$ 22,363
Noncompete Agreements [Member]
Amortizable intangible assets:
Estimated useful lives	36 months	36 months
Gross carrying amount	$ 10,254	$ 6,761
Accumulated amortization	(6,047)	(4,116)
Net carrying value	4,207	2,645
Unpatented Technology [Member]
Amortizable intangible assets:
Gross carrying amount	9,014	9,188
Accumulated amortization	(8,393)	(7,881)
Net carrying value	$ 621	$ 1,307
Minimum [Member] | Customer Relationships [Member]
Amortizable intangible assets:
Estimated useful lives	40 months	40 months
Minimum [Member] | Trade Names [Member]
Amortizable intangible assets:
Estimated useful lives	45 months	45 months
Minimum [Member] | Unpatented Technology [Member]
Amortizable intangible assets:
Estimated useful lives	24 months	24 months
Maximum [Member] | Customer Relationships [Member]
Amortizable intangible assets:
Estimated useful lives	60 months	60 months
Maximum [Member] | Trade Names [Member]
Amortizable intangible assets:
Estimated useful lives	84 months	84 months
Maximum [Member] | Unpatented Technology [Member]
Amortizable intangible assets:
Estimated useful lives	40 months	40 months