Note 5 - Goodwill and Intangible Assets (Details) - Goodwill (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Balance	$ 370,143	$ 300,260
Goodwill acquired during the year	3,024	60,373
Adjustments to prior year acquisitions	5,607	7,109
Effect of foreign currency translation	(9,462)	2,401
Balance	369,312	370,143
UNITED STATES
Goodwill [Line Items]
Balance	266,521	247,940
Goodwill acquired during the year	350	13,776
Adjustments to prior year acquisitions	6,199	4,805
Balance	273,070	266,521
CANADA
Goodwill [Line Items]
Balance	21,041	21,287
Goodwill acquired during the year		419
Adjustments to prior year acquisitions		(1,383)
Effect of foreign currency translation	(1,762)	718
Balance	19,279	21,041
UNITED KINGDOM
Goodwill [Line Items]
Balance	36,118	31,033
Goodwill acquired during the year	2,674
Adjustments to prior year acquisitions		3,687
Effect of foreign currency translation	801	1,398
Balance	39,593	36,118
AUSTRALIA
Goodwill [Line Items]
Balance	46,463
Goodwill acquired during the year		46,178
Adjustments to prior year acquisitions	(592)
Effect of foreign currency translation	(8,501)	285
Balance	$ 37,370	$ 46,463