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Segment Information and Concentrations of Risk (Details 2) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Net revenues by geographic region |  |  |
Net revenues by geographic region | 100.00% | 100.00% | 100.00%
United States and Canada [Member] |  |  |
Net revenues by geographic region |  |  |
Net revenues by geographic region | 93.10% | 93.50% | 95.00%
Latin America [Member] |  |  |
Net revenues by geographic region |  |  |
Net revenues by geographic region | 2.40% | 0.00% | 0.00%
Europe, Middle East and Africa [Member] |  |  |
Net revenues by geographic region |  |  |
Net revenues by geographic region | 4.10% | 4.00% | 4.70%
Asia and Australia [Member] |  |  |
Net revenues by geographic region |  |  |
Net revenues by geographic region | 0.40% | 2.50% | 0.30%

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- Details
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Namespace Prefix: | nvtl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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