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Acquisitions - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Business
Dec. 31, 2013
Dec. 31, 2012
Aug. 29, 2014
Sep. 30, 2014
Jul. 15, 2014
Jun. 20, 2014
Jan. 30, 2014
Business Acquisition [Line Items]                                
Business acquisition, transaction costs                 $ 9,433us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed              
Business combinations net income during period from acquired business 1,619us-gaap_NetIncomeLoss (3,840)us-gaap_NetIncomeLoss 5,200us-gaap_NetIncomeLoss 5,238us-gaap_NetIncomeLoss 4,485us-gaap_NetIncomeLoss 5,052us-gaap_NetIncomeLoss 4,770us-gaap_NetIncomeLoss 2,871us-gaap_NetIncomeLoss 8,217us-gaap_NetIncomeLoss 17,178us-gaap_NetIncomeLoss 24,268us-gaap_NetIncomeLoss          
Payments to Acquire Businesses 20,995us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets               20,995us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets              
Business acquisition, transaction costs 1,242us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts               1,242us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts              
Goodwill from acquisition                 76,486us-gaap_GoodwillAcquiredDuringPeriod              
Non-controlling interest                 (32)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest              
Operating assets acquired in cash                 257,664us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired              
Number of businesses acquired                 4us-gaap_NumberOfBusinessesAcquired              
Payment for acquisition of non-controlling interest                 2,528us-gaap_PaymentsToMinorityShareholders              
Metal Bearing Components Segment [Member]                                
Business Acquisition [Line Items]                                
Goodwill from acquisition                 2,494us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_MetalBearingComponentsSegmentMember		              
Autocam Precision Components Segment [Member]                                
Business Acquisition [Line Items]                                
Goodwill from acquisition                 73,992us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_AutocamPrecisionComponentsSegmentMember		              
Autocam [Member]                                
Business Acquisition [Line Items]                                
Date of acquisition                 Aug. 29, 2014              
Payments to acquire                       256,837us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		        
Debt and capital lease obligations                       29,848nnbr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDebtAndCapitalLeaseObligation
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		        
Business acquisition, consideration transferred in NN stock                       31,717us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		        
Term loan facility 350,000us-gaap_LoansPayable
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		               350,000us-gaap_LoansPayable
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		              
Business acquisition, transaction costs                 3,846us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		              
Increase in cost of sales   1,158nnbr_NonrecurringCostOfGoodsSoldIncrease
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		             1,158nnbr_NonrecurringCostOfGoodsSoldIncrease
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		              
Business combinations revenue during period from acquired business                 80,821us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		       80,821us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		      
Business combinations net income during period from acquired business                 3,686us-gaap_NetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		       3,686us-gaap_NetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		      
Payments to Acquire Businesses 407,847us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		 401,060us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		             407,847us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		       401,060us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		      
Intangible assets subject to amortization 51,660us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		 51,098us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		             51,660us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		       51,098us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		      
Net assets acquired 288,554us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		 288,554us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		             288,554us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		       288,554us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember		      
Autocam [Member] | Twelve Month [Member]                                
Business Acquisition [Line Items]                                
Business acquisition, transaction costs                 6,912us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember
/ us-gaap_StatementScenarioAxis
= nnbr_TwelveMonthMember		              
Business acquisition, deferred financing costs write off                 2,974nnbr_BusinessCombinationDeferredFinancingCostsWriteOff
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember
/ us-gaap_StatementScenarioAxis
= nnbr_TwelveMonthMember		              
Increase in cost of sales                 1,158nnbr_NonrecurringCostOfGoodsSoldIncrease
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember
/ us-gaap_StatementScenarioAxis
= nnbr_TwelveMonthMember		              
RFK and Chelsea [Member] | Metal Bearing Components Segment [Member]                                
Business Acquisition [Line Items]                                
Goodwill from acquisition                 2,494us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= nnbr_RfkAndChelseaGrindingMember
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_MetalBearingComponentsSegmentMember		              
RFK and Chelsea [Member] | Customer Contracts and Trade Names [Member]                                
Business Acquisition [Line Items]                                
Intangible assets subject to amortization 2,705us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= nnbr_RfkAndChelseaGrindingMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= nnbr_CustomerContractsAndTradeNamesMember		               2,705us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= nnbr_RfkAndChelseaGrindingMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= nnbr_CustomerContractsAndTradeNamesMember		              
Finite-lived intangible assets, weighted-average useful life                 11 years              
Chelsea Grinding [Member]                                
Business Acquisition [Line Items]                                
Date of acquisition                 Jul. 15, 2014              
Payments to acquire                           3,100us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= nnbr_ChelseaGrindingMember		    
Revenue during period from acquired business                           1,100us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= nnbr_ChelseaGrindingMember		    
RFK [Member]                                
Business Acquisition [Line Items]                                
Date of acquisition                 Jun. 20, 2014              
Payments to acquire   2,527us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= nnbr_RfkValjciciKonjicMember		                         9,756us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= nnbr_RfkValjciciKonjicMember		  
Business combinations revenue during period from acquired business                 5,100us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= nnbr_RfkValjciciKonjicMember		              
Business combinations net income during period from acquired business                 165us-gaap_NetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= nnbr_RfkValjciciKonjicMember		              
Percentage of shares acquired   99.70%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= nnbr_RfkValjciciKonjicMember		                     99.70%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= nnbr_RfkValjciciKonjicMember		   79.20%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= nnbr_RfkValjciciKonjicMember		  
Non-controlling interest                 32us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ us-gaap_BusinessAcquisitionAxis
= nnbr_RfkValjciciKonjicMember		              
Percentage of shares owned by non controlling owners 0.30%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_BusinessAcquisitionAxis
= nnbr_RfkValjciciKonjicMember		               0.30%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_BusinessAcquisitionAxis
= nnbr_RfkValjciciKonjicMember		              
VS [Member]                                
Business Acquisition [Line Items]                                
Date of acquisition                 Jan. 30, 2014              
Business combinations revenue during period from acquired business                 14,742us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= nnbr_VsIndustriesVsPrecisionLlcAndVsPrecisionSaDeDvMember		              
Business combinations net income during period from acquired business                 (1,011)us-gaap_NetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= nnbr_VsIndustriesVsPrecisionLlcAndVsPrecisionSaDeDvMember		              
Operating assets acquired in cash                 260,192us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= nnbr_VsIndustriesVsPrecisionLlcAndVsPrecisionSaDeDvMember		             5,580us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= nnbr_VsIndustriesVsPrecisionLlcAndVsPrecisionSaDeDvMember
Liabilities assumed                               2,968us-gaap_LiabilitiesAssumed1
/ us-gaap_BusinessAcquisitionAxis
= nnbr_VsIndustriesVsPrecisionLlcAndVsPrecisionSaDeDvMember
Integration costs net of tax                 503us-gaap_BusinessCombinationIntegrationRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= nnbr_VsIndustriesVsPrecisionLlcAndVsPrecisionSaDeDvMember		              
Number of businesses acquired                 4us-gaap_NumberOfBusinessesAcquired
/ us-gaap_BusinessAcquisitionAxis
= nnbr_VsIndustriesVsPrecisionLlcAndVsPrecisionSaDeDvMember		              
Net assets acquired 277,832us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= nnbr_VsIndustriesVsPrecisionLlcAndVsPrecisionSaDeDvMember		               277,832us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= nnbr_VsIndustriesVsPrecisionLlcAndVsPrecisionSaDeDvMember		              
Net cash received in the acquisition                 17,640us-gaap_CashAcquiredFromAcquisition
/ us-gaap_BusinessAcquisitionAxis
= nnbr_VsIndustriesVsPrecisionLlcAndVsPrecisionSaDeDvMember		              
Payment for acquisition of non-controlling interest                 2,528us-gaap_PaymentsToMinorityShareholders
/ us-gaap_BusinessAcquisitionAxis
= nnbr_VsIndustriesVsPrecisionLlcAndVsPrecisionSaDeDvMember		              
VS [Member] | Autocam Precision Components Segment [Member]                                
Business Acquisition [Line Items]                                
Net assets acquired 256,837us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= nnbr_VsIndustriesVsPrecisionLlcAndVsPrecisionSaDeDvMember
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_AutocamPrecisionComponentsSegmentMember		               256,837us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= nnbr_VsIndustriesVsPrecisionLlcAndVsPrecisionSaDeDvMember
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_AutocamPrecisionComponentsSegmentMember		              
VS [Member] | Other Segments [Member]                                
Business Acquisition [Line Items]                                
Net assets acquired $ 20,995us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= nnbr_VsIndustriesVsPrecisionLlcAndVsPrecisionSaDeDvMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		               $ 20,995us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= nnbr_VsIndustriesVsPrecisionLlcAndVsPrecisionSaDeDvMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember