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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended			12 Months Ended
	Dec. 27, 2012	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2012	Dec. 31, 2014 Business	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Line Items]
U.S. federal statutory rate					34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Loss realized from continuing operation					$ (9,341)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	$ 8,259us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	$ 7,385us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Acquisition related cost of which loss realized		1,473us-gaap_BusinessCombinationAcquisitionRelatedCosts	8,407us-gaap_BusinessCombinationAcquisitionRelatedCosts		9,248us-gaap_BusinessCombinationAcquisitionRelatedCosts
Foreign tax credit expiration					1,302us-gaap_IncomeTaxReconciliationTaxCreditsForeign
Non-deductible mergers and acquisition costs					1,971nnbr_IncomeTaxReconciliationMergerRelatedExpenses
Effective tax rate on non deductible expense					44.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations	32.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations	19.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Non-U.S. earnings taxed at different rates					1,714us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	834us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	1,606us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Decrease in valuation allowance					(1,434)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(818)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(12,740)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Acquisition related cost non - deductible					6,000nnbr_BusinessCombinationAcquisitionNonDeductibleRelatedCosts
Valuation allowance on deferred tax assets		1,434us-gaap_DeferredTaxAssetsValuationAllowance		2,252us-gaap_DeferredTaxAssetsValuationAllowance	1,434us-gaap_DeferredTaxAssetsValuationAllowance	1,434us-gaap_DeferredTaxAssetsValuationAllowance	2,252us-gaap_DeferredTaxAssetsValuationAllowance	12,066us-gaap_DeferredTaxAssetsValuationAllowance
Tax credit expiration date					Dec. 31, 2014
Number of acquisitions					4us-gaap_NumberOfBusinessesAcquired
2012 and 2011 Combined pre tax income							9,000nnbr_AggregateIncomeLossBeforeTax
Net operating losses used to offset tax expenses				9,000nnbr_NetOperatingLossesUtilizedToOffsetTaxExpense
Fully utilization period of net operating losses, Start year							2013
Fully utilization period of net operating losses, End year							2014
Reversal of Deferred tax assets valuation allowance							8,512nnbr_ReversalOfDeferredTaxAssetsValuationAllowance
Distribution to US Parent company	48,000nnbr_DistributionFromForeignHoldingCompany
Distribution pertained to earnings and profits earned							9,000nnbr_DistributionFromForeignHoldingCompanyRelatedToPriorPeriod
Impact of tax in earnings and profits							3,079nnbr_IncomeTaxReconciliationCapitalGainOnReturnOfBasis
Unrecognized tax benefits		3,834us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate			3,834us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Additional foreign interest and penalties		1,003us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued			1,003us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Autocam [Member]
Income Taxes [Line Items]
Deferred liability net of tax		43,803us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = nnbr_AutocamCorporationMember			43,803us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = nnbr_AutocamCorporationMember
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Interest accrued on income taxes		31us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember			31us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember	32us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Increase decrease in interest and penalties				443us-gaap_IncomeTaxExaminationIncreaseDecreaseInLiabilityFromPriorYear / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember			443us-gaap_IncomeTaxExaminationIncreaseDecreaseInLiabilityFromPriorYear / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Interest accrued on income taxes		17us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember			17us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Increase decrease in interest and penalties				245us-gaap_IncomeTaxExaminationIncreaseDecreaseInLiabilityFromPriorYear / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember			245us-gaap_IncomeTaxExaminationIncreaseDecreaseInLiabilityFromPriorYear / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
United States [Member]
Income Taxes [Line Items]
Acquisition related cost of which loss realized					$ 14,831us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_StatementGeographicalAxis = country_US

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