Segment and Geographic Information - Revenue by Ship-to Destination (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenue	$ 261,072	$ 247,047	$ 500,938	$ 475,738
Americas
Segment Reporting Information [Line Items]
Revenue	122,294	114,014	239,679	223,909
Europe, Middle East, and Africa (“EMEA”)
Segment Reporting Information [Line Items]
Revenue	94,010	101,513	182,185	189,546
Asia Pacific (“APAC”)
Segment Reporting Information [Line Items]
Revenue	$ 44,768	$ 31,520	$ 79,074	$ 62,283