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Earnings Per Share - Narrative (Detail) (USD $) | 3 Months Ended | 0 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 27, 2015 employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Issued (shares) | 1,506,700 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod |  |
Weighted-average common shares outstanding (in shares) | 46,262,000 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 34,172,000 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted |
Weighted-average options, RSUs, and ESPP shares outstanding (shares) | 5,483,254 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 5,120,187 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |
Feeney Wireless |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of grant recipients (employees) |  |  | 91 nvtl_SharedBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodNumberofGrantees / us-gaap_BusinessAcquisitionAxis = nvtl_FeeneyWirelessMember
Issued (shares) |  |  | 323,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_BusinessAcquisitionAxis = nvtl_FeeneyWirelessMember
Exercise price ($ per share) |  |  | $ 4.65 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_BusinessAcquisitionAxis = nvtl_FeeneyWirelessMember
Employee Stock Option | Feeney Wireless |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expected term |  |  | 10 years
Vesting on First Anniversary | Employee Stock Option | Feeney Wireless |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage |  |  | 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_BusinessAcquisitionAxis = nvtl_FeeneyWirelessMember / us-gaap_VestingAxis = nvtl_ShareBasedCompensationAwardTrancheOneMember
Monthly Vesting After First Anniversary | Employee Stock Option | Feeney Wireless |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage |  |  | 75.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_BusinessAcquisitionAxis = nvtl_FeeneyWirelessMember / us-gaap_VestingAxis = nvtl_ShareBasedCompensationAwardTrancheTwoMember

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- Definition Shared-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Number of Grantees + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS). + References No definition available. + Details
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