Segment Information and Geographic Data - Revenue by Ship-to Destination (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues For Geographical Areas In Which Company Operates [Line Items]
Total revenue	$ 180,298	$ 163,901	$ 351,657	$ 323,957
Reportable Geographical Components [Member]
Revenues For Geographical Areas In Which Company Operates [Line Items]
Total revenue	180,298	163,901	351,657	323,957
Reportable Geographical Components [Member] | Americas [Member]
Revenues For Geographical Areas In Which Company Operates [Line Items]
Total revenue	100,516	82,725	194,413	164,906
Reportable Geographical Components [Member] | Europe, Middle East and Africa ('EMEA") [Member]
Revenues For Geographical Areas In Which Company Operates [Line Items]
Total revenue	49,984	51,560	100,030	106,686
Reportable Geographical Components [Member] | Asia Pacific ("APAC") [Member]
Revenues For Geographical Areas In Which Company Operates [Line Items]
Total revenue	29,798	29,616	57,214	52,365
Reportable Geographical Components [Member] | Japan [Member]
Revenues For Geographical Areas In Which Company Operates [Line Items]
Total revenue	5,815	7,867	13,034	14,819
Reportable Geographical Components [Member] | APAC, ex Japan [Member]
Revenues For Geographical Areas In Which Company Operates [Line Items]
Total revenue	$ 23,983	$ 21,749	$ 44,180	$ 37,546