Segment Information, Geographic Regions, and Major Customers - Reconciliation of Operating Segment Gross Profit to Condensed Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Stock-based compensation expense	$ (7,613)	$ (7,105)	$ (17,893)	$ (18,390)
Gross profit	127,252	125,047	250,782	243,444
Cost of Revenue [Member]
Segment Reporting Information [Line Items]
Stock-based compensation expense	(665)	(534)	(1,499)	(1,231)
Material Reconciling Items [Member]
Segment Reporting Information [Line Items]
Other items excluded from segment profit				(315)
Gross profit	127,252	125,047	250,782	243,444
Material Reconciling Items [Member] \| Segment Profit [Member]
Segment Reporting Information [Line Items]
Segment gross profit	127,917	125,581	252,281	244,990
Material Reconciling Items [Member] \| Cost of Revenue [Member]
Segment Reporting Information [Line Items]
Stock-based compensation expense	$ (665)	$ (534)	$ (1,499)	$ (1,231)

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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