Subsequent Events - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	1 Months Ended
	Mar. 02, 2013 Subsequent Event Ultrasonix Medical Corporation	Jan. 31, 2013 Dividend Declared
Subsequent Event [Line Items]
Business acquisition description	on March 2, 2013, we completed our acquisition of (i) all of the issued and outstanding shares of capital stock of Ultrasonix Medical Corporation (U.S.A.) and customer lists, intangibles and goodwill related solely to sales destined to the United States and (ii) through 8385998 Canada Inc., a Canadian corporation and our direct wholly-owned subsidiary, all of the outstanding equity securities of Ultrasonix Medical Corporation, which we refer to as Ultrasonix, a privately held company located in Vancouver, Canada, pursuant to a “plan of arrangement” under Canadian law. Ultrasonix is a supplier of advanced ultrasound systems for point-of-care and general imaging applications with over 5,000 systems installed worldwide.
Business acquisition, reason for acquisition	The acquisition was undertaken by us in order to accelerate our expansion into the point-of-care ultrasound market.
Business acquisition, net purchase price paid in cash	$ 83,000
Dividend declaration date		Mar. 07, 2013
Dividend declared		$ 0.10
Dividend payable date		Apr. 02, 2013
Dividend record date		Mar. 22, 2013