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Geographic Information and Concentrations of Risk - Schedule of Geographic Concentration of Net Revenues (Detail) - Net Revenues - Geographic Concentration	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration percentage	100.00%	100.00%	100.00%	100.00%
United States and Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration percentage	96.40%	90.30%	96.20%	90.30%
Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration percentage	0.40%	1.60%	0.60%	1.30%
Europe, Middle East, Africa and other
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration percentage	2.90%	7.30%	3.00%	7.30%
Asia and Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration percentage	0.30%	0.80%	0.20%	1.10%

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 275



-SubTopic 10



-Section 50



-Paragraph 18



-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 825



-SubTopic 10



-Section 50



-Paragraph 20



-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 275



-SubTopic 10



-Section 50



-Paragraph 20



-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592



Reference 4: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 825



-SubTopic 10



-Section 50



-Paragraph 21



-Subparagraph (a)



-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611

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