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Goodwill, Net - Changes in Carrying Amount of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Line Items]    
Beginning Balance $ 8,624us-gaap_Goodwill $ 8,254us-gaap_Goodwill
Currency impacts (1,169)us-gaap_GoodwillTranslationAdjustments 370us-gaap_GoodwillTranslationAdjustments
Goodwill acquired in acquisition 76,486us-gaap_GoodwillAcquiredDuringPeriod  
Ending Balance 83,941us-gaap_Goodwill 8,624us-gaap_Goodwill
Metal Bearing Components Segment [Member]    
Goodwill [Line Items]    
Beginning Balance 8,624us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_MetalBearingComponentsSegmentMember
8,254us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_MetalBearingComponentsSegmentMember
Currency impacts (1,169)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_MetalBearingComponentsSegmentMember
370us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_MetalBearingComponentsSegmentMember
Goodwill acquired in acquisition 2,494us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_MetalBearingComponentsSegmentMember
 
Ending Balance 9,949us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_MetalBearingComponentsSegmentMember
8,624us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_MetalBearingComponentsSegmentMember
Autocam Precision Components Segment [Member]    
Goodwill [Line Items]    
Goodwill acquired in acquisition 73,992us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_AutocamPrecisionComponentsSegmentMember
 
Ending Balance $ 73,992us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_AutocamPrecisionComponentsSegmentMember