Note 5 - Goodwill and Intangible Assets (Detail) - Goodwill (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Balance at beginning of year	$ 300,260	$ 90,582
Goodwill acquired during the year	60,373	209,619
Adjustments to prior year acquisitions	7,109	1,799
Effect of foreign currency translation	2,401	(1,740)
Balance at end of year	$ 370,143	$ 300,260