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Segment Information - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended 1 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
Segment
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Segment Reporting Information [Line Items]                        
Number of reportable segments                 3us-gaap_NumberOfReportableSegments      
Non-recurring costs related to the merger with Autocam and the other three acquisitions                 $ 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  
Autocam [Member]                        
Segment Reporting Information [Line Items]                        
Non-recurring costs related to the merger with Autocam and the other three acquisitions                 3,846us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed
/ 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
Increase in cost of sales   1,158nnbr_NonrecurringCostOfGoodsSoldIncrease
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember
            1,158nnbr_NonrecurringCostOfGoodsSoldIncrease
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember
     
Corporate and Consolidations [Member] | Autocam [Member]                        
Segment Reporting Information [Line Items]                        
Non-recurring costs related to the merger with Autocam and the other three acquisitions                 9,837us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed
/ us-gaap_BusinessAcquisitionAxis
= nnbr_AutocamCorporationMember
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_CorporateAndConsolidationsMember
     
Corporate and Consolidations [Member] | Other Acquisitions [Member]                        
Segment Reporting Information [Line Items]                        
Non-recurring costs related to the merger with Autocam and the other three acquisitions                 $ 9,837us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed
/ us-gaap_BusinessAcquisitionAxis
= nnbr_OtherAcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_CorporateAndConsolidationsMember