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v2.4.0.8

Post-Employment Benefit Liabilities - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2014
Minimum [Member] |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |
Awards for employees | 25 years
Maximum [Member] |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |
Awards for employees | 40 years

X
- Definition Post employment benefit period of service for award grant. + References No definition available. + Details
Name: | nnbr_PostEmploymentBenefitPeriodOfServiceForAwardGrant
Namespace Prefix: | nnbr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration