Note 1 - Description of Business (Detail) - Business Acquisitions - Consideration Summary (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Aug. 31, 2011	Dec. 31, 2011 CRTS [Member]	Jun. 30, 2011 CRTS [Member]	Dec. 31, 2011 Hockway [Member]	Aug. 31, 2011 Hockway [Member]	Aug. 31, 2011 Fyfe [Member]
Cash	$ 146,919			$ 24,000		$ 4,606	$ 118,313	[1]
Estimated fair value of earnout payments to shareholders	16,214		14,800	14,760	1,500	1,454		[1]
Total consideration recorded	$ 163,133	$ 115,800		$ 38,760		$ 6,060	$ 118,313	[1]

[1] Includes the cash purchase price at closing of $115.8 million plus a preliminary working capital adjustment to the sellers of $2.5 million, of which $1.8 million was paid in 2011.