Note 5 - Goodwill and Intangible Assets (Details) - Intangible Assets - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Amortizable intangible assets:
Gross carrying amount	$ 332,977	$ 328,424
Accumulated amortization	(248,781)	(225,841)
Net carrying value	84,196	102,583
Customer Relationships [Member]
Amortizable intangible assets:
Gross carrying amount	245,332	244,211
Accumulated amortization	(185,655)	(167,943)
Net carrying value	59,677	76,268
Trade Names [Member]
Amortizable intangible assets:
Gross carrying amount	68,627	68,264
Accumulated amortization	(49,826)	(45,901)
Net carrying value	$ 18,801	$ 22,363
Noncompete Agreements [Member]
Amortizable intangible assets:
Estimated useful lives	36 months	36 months
Gross carrying amount	$ 9,834	$ 6,761
Accumulated amortization	(5,080)	(4,116)
Net carrying value	4,754	2,645
Unpatented Technology [Member]
Amortizable intangible assets:
Gross carrying amount	9,184	9,188
Accumulated amortization	(8,220)	(7,881)
Net carrying value	$ 964	$ 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