Note 5 - Goodwill and Intangible Assets (Detail) - Goodwill (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Balance at beginning of period	$ 370,143	$ 300,260
Goodwill acquired during the period		60,374
Adjustments to prior year acquisitions	(592)	7,109
Effect of foreign currency translation	(2,693)	2,400
Balance at end of period	$ 366,858	$ 370,143