Note 5 - Goodwill and Intangible Assets (Detail) - Goodwill (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Balance at beginning of period	$ 300,260	$ 90,582
Goodwill acquired during the period		209,619
Adjustments to prior year acquisitions	1,078	1,799
Effect of foreign currency translation	1,681	(1,740)
Balance at end of period	$ 303,019	$ 300,260