Note 5 - Goodwill and Intangible Assets (Detail) - Goodwill (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Balance at beginning of period	$ 300,260	$ 90,582
Goodwill acquired during the period	45,103	209,619
Adjustments to prior year acquisitions	3,983	1,799
Effect of foreign currency translation	2,680	(1,740)
Balance at end of period	$ 352,026	$ 300,260