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Goodwill, net - Changes in Carrying Amount of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Goodwill [Line Items]    
Beginning Balance $ 83,941us-gaap_Goodwill  
Currency translation impacts (937)us-gaap_GoodwillTranslationAdjustments  
Ending Balance 83,004us-gaap_Goodwill  
Metal Bearing Components Segment [Member]    
Goodwill [Line Items]    
Beginning Balance 9,949us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_MetalBearingComponentsSegmentMember		  
Currency translation impacts (937)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_MetalBearingComponentsSegmentMember		  
Ending Balance 9,012us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_MetalBearingComponentsSegmentMember		  
Autocam Precision Components Segment [Member]    
Goodwill [Line Items]    
Beginning Balance   73,992us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_AutocamPrecisionComponentsSegmentMember
Ending Balance $ 73,992us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_AutocamPrecisionComponentsSegmentMember		 $ 73,992us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= nnbr_AutocamPrecisionComponentsSegmentMember