Balance Sheet Details - Schedule of Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Roll Forward]
Balance at December 31, 2012 and 2011	$ 180,838	$ 168,609
Change in Phygen goodwill	(1,610)	10,124
Effect of foreign exchange rate on goodwill	3,776	2,105
Balance at December 31,	$ 183,004	$ 180,838