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Post-Employment Benefit Liabilities (Details Textual)	3 Months Ended
	Mar. 31, 2013
Maximum [Member]
Post-Employment Benefit Liabilities (Textual) [Abstract]
Award for employees	40 years
Minimum [Member]
Post-Employment Benefit Liabilities (Textual) [Abstract]
Award for employees	25 years

X

- Definition

Award for employees for years of service.

+ References

No definition available.

+ Details

Name:	nnbr_AwardForEmployeesForYearsOfService
Namespace Prefix:	nnbr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	nnbr_PostEmploymentBenefitLiabilitiesTextualAbstract
Namespace Prefix:	nnbr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration