Note 5 - Goodwill and Intangible Assets (Details) - Goodwill (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Goodwill [Line Items]
Balance	$ 369,312
Goodwill acquired during the year	138,561
Adjustments to prior year acquisitions	(309)
Effect of foreign currency translation	(2,937)
Balance	504,627
UNITED STATES
Goodwill [Line Items]
Balance	273,070
Goodwill acquired during the year	127,691
Adjustments to prior year acquisitions	64
Balance	400,825
CANADA
Goodwill [Line Items]
Balance	19,279
Effect of foreign currency translation	(1,206)
Balance	18,073
UNITED KINGDOM
Goodwill [Line Items]
Balance	39,593
Goodwill acquired during the year	1,629
Adjustments to prior year acquisitions	(373)
Effect of foreign currency translation	(668)
Balance	40,181
AUSTRALIA
Goodwill [Line Items]
Balance	37,370
Goodwill acquired during the year	9,241
Effect of foreign currency translation	(1,063)
Balance	$ 45,548