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Segment Information and Concentrations of Risk - Schedule of Geographic Concentration of Net Revenues (Detail) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 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 | 95.80% | 92.70% | 95.60% | 92.20%
Operating Segments [Member] | Latin America [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenues by geographic region | 0.80% | 1.50% | 0.60% | 3.00%
Operating Segments [Member] | Europe, Middle East and Africa [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenues by geographic region | 3.30% | 5.50% | 3.70% | 4.40%
Operating Segments [Member] | Asia and Australia [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenues by geographic region | 0.10% | 0.30% | 0.10% | 0.40%

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

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