XML 45 R39.htm IDEA: XBRL DOCUMENT
v2.4.0.8

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%

X
- Definition Revenue from external customers by geographic region. + References No definition available. + Details
Name: | nvtl_RevenueFromExternalCustomersByGeographicRegion
Namespace Prefix: | nvtl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration