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Segment Information and Concentrations of Risk - Schedule of Geographic Concentration of Net Revenues (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region	100.00%	100.00%	100.00%	100.00%
Operating Segments [Member] | United States and Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region	96.50%	94.00%	95.90%	92.70%
Operating Segments [Member] | Latin America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region	0.80%	0.00%	0.70%	2.20%
Operating Segments [Member] | Europe, Middle East and Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region	2.40%	5.70%	3.20%	4.70%
Operating Segments [Member] | Asia and Australia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region	0.30%	0.30%	0.20%	0.40%

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- Definition

Revenue from external customers by geographic region.

+ References

No definition available.

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- Details

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