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Employee Benefit Plans - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Aug. 29, 2014
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]        
Minimum age for IRS catch up provision limit 50 years      
Vesting percentage 100.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage      
Matching contribution, Amount $ 764us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 349us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 335us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount  
Severance indemnities paid to the pension fund 1/13.5 of the gross salaries      
Measurement date December 31      
Discount rates assumed for calculating the actuarial present value 1.90%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate      
Compensation growth rate 2.90%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease      
Expected benefit payments under pension plan for 2015 0us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextRollingTwelveMonths      
Expected benefit payments under pension plan for 2016 0us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsRollingYearTwo      
Expected benefit payments under pension plan for 2017 16us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsRollingYearThree      
Expected benefit payments under pension plan for 2018 8us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsRollingYearFour      
Expected benefit payments under pension plan from 2020-2024 379us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveRollingYearsThereafter      
Assumed rate of return on assets of the Pension Plan 2.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets      
Targeted goal of allocating plan assets We have a targeted goal of allocating plan assets one-third to equity and two-thirds to fixed income securities.      
Expected funding obligation under pension plan $ 132us-gaap_DefinedBenefitPlanBenefitObligation     $ 1,549us-gaap_DefinedBenefitPlanBenefitObligation
Equity Securities [Member]        
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]        
Actual allocations of pension plan assets 19.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
     
Fixed Income Securities [Member]        
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]        
Actual allocations of pension plan assets 81.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeFundsMember
     
Minimum [Member]        
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]        
Compensation to the plans 1.00%nnbr_DefinedContributionPlanAnnualContributionPerEmployeePercent
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Award for employees 25 years      
Maximum [Member]        
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]        
Compensation to the plans 60.00%nnbr_DefinedContributionPlanAnnualContributionPerEmployeePercent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Award for employees 40 years