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Earnings Per Share - Narrative (Detail) (USD $)
3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 27, 2015
employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Issued (shares) 1,506,700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod    
Weighted-average common shares outstanding (in shares) 46,262,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 34,172,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted  
Weighted-average options, RSUs, and ESPP shares outstanding (shares) 5,483,254us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 5,120,187us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount  
Feeney Wireless      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of grant recipients (employees)     91nvtl_SharedBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodNumberofGrantees
/ us-gaap_BusinessAcquisitionAxis
= nvtl_FeeneyWirelessMember
Issued (shares)     323,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_BusinessAcquisitionAxis
= nvtl_FeeneyWirelessMember
Exercise price ($ per share)     $ 4.65us-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