Segment Information and Concentrations of Risk - Schedule of Geographic Concentration of Net Revenues (Detail) (Net Revenues [Member], Geographic Concentration [Member])	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration percentage	100.00%	100.00%	100.00%
United States and Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration percentage	95.60%	93.10%	93.50%
Latin America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration percentage	0.80%	2.40%	0.00%
Europe, Middle East and Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration percentage	3.40%	4.10%	4.00%
Asia and Australia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration percentage	0.20%	0.40%	2.50%