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Segment Information and Concentrations of Risk - Schedule of Geographic Concentration of Net Revenues (Detail) (Net Revenues [Member], Geographic Concentration [Member]) | 12 Months Ended
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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%

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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 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: 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=6927468&loc=d3e6404-108592 Reference 3: 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=28364263&loc=d3e13531-108611 Reference 4: 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=6927468&loc=d3e6351-108592 + Details
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