Note 4 - Goodwill and Acquired Intangible Assets (Detail) - Goodwill Reconciliation (USD $)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Beginning balance (January 1, 2011 and 2010, respectively) (1)	$ 190,120,000	[1],[2]	$ 188,600,000	[1]
Additions to goodwill through acquisitions(2)(3)	63,700,000	[3]	1,600,000	[4]
Foreign currency translation	(3,900,000)		(100,000)
Goodwill at end of period(4)	$ 249,888,000	[2]	$ 190,120,000	[1],[2]

[1] During 2011, the Company revised previously reported goodwill balances related to foreign currency translation. As a result of this revision, goodwill as of January 1, 2010 was revised from the previously reported amount of $182.1 million to $188.6 million. See Note 2 for additional information.

[2] The Company does not have any accumulated impairment charges.

[3] During 2011, the Company recorded goodwill of $18.5 million related to the acquisition of CRTS, $2.0 million related to the acquisition of Hockway and $43.2 million related to the acquisition of Fyfe NA as discussed in Note 1.

[4] During 2010, the Company recorded goodwill of $1.6 million related to the acquisition of its licensee in Singapore.