Note 5 - Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

	United States		Canada			United Kingdom			Australia			Total
Balance at December 31, 2013	$	273,070		19,279			39,593			37,370			369,312
Goodwill acquired during the year		128,426		—			1,640			5,968			136,034
Adjustments to prior year acquisitions		64		—			(324	)		—			(260	)
Effect of foreign currency translation		—		(2,101	)		(2,555	)		(4,751	)		(9,407	)
Balance at December 31, 2014		401,560	$	17,178		$	38,354		$	38,587		$	495,679
Goodwill acquired during the year		10,742		222			13,332			—			24,296
Adjustments to prior year acquisitions		200		—			—			—			200
Effect of foreign currency translation		—		(2,036	)		(2,258	)		(7,584	)		(11,878	)
Balance at December 31, 2015	$	412,502	$	15,364		$	49,428		$	31,003		$	508,297

Schedule of Finite-Lived Intangible Assets [Table Text Block]

				December 31, 2014
	Estimated useful lives (months)			Gross carrying amount		Accumulated amortization			Net carrying value
Amortizable intangible assets:
Customer relationships	40	to	60	$	244,211	$	(167,943	)	$	76,268
Tradenames	45	to	84		68,264		(45,901	)		22,363
Covenants not to compete		36			6,761		(4,116	)		2,645
Technology	24	to	40		9,188		(7,881	)		1,307
Totals				$	328,424	$	(225,841	)	$	102,583

				December 31, 2015
	Estimated useful lives (months)			Gross carrying amount		Accumulated amortization			Net carrying value
Amortizable intangible assets:
Customer relationships	40	to	60	$	263,293	$	(199,266	)	$	64,027
Tradenames	45	to	84		68,172		(52,354	)		15,818
Covenants not to compete		36			10,254		(6,047	)		4,207
Technology	24	to	40		9,014		(8,393	)		621
Totals				$	350,733	$	(266,060	)	$	84,673

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

	Amount
Years ended December 31:
2016	$	41,461
2017		29,222
2018		10,147
2019		3,796
2020		47
Total	$	84,673