Segment Information and Geographic Data - Revenue by Ship-to Destination (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Total revenue	$ 228,694	$ 197,674	$ 625,969	$ 579,327
Americas [Member]
Segment Reporting Information [Line Items]
Total revenue	121,116	116,137	337,050	318,685
Europe, Middle East, and Africa ("EMEA") [Member]
Segment Reporting Information [Line Items]
Total revenue	79,934	54,212	205,191	181,652
Asia Pacific ("APAC") [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 27,644	$ 27,325	$ 83,728	$ 78,990