Segment Information, Geographic Regions, and Major Customers - Reconciliation of Operating Segment Gross Profit to Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Stock-based compensation expense	$ (11,557)	$ (8,892)
Gross profit	118,372	105,440
Cost of Revenue [Member]
Segment Reporting Information [Line Items]
Stock-based compensation expense	(722)	(824)
Material Reconciling Items [Member]
Segment Reporting Information [Line Items]
Other items excluded from segment profit	(314)	(117)
Gross profit	118,372	105,440
Material Reconciling Items [Member] \| Segment Profit [Member]
Segment Reporting Information [Line Items]
Segment gross profit	119,408	106,381
Material Reconciling Items [Member] \| Cost of Revenue [Member]
Segment Reporting Information [Line Items]
Stock-based compensation expense	$ (722)	$ (824)

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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