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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Commitments and Contingencies (Textual) [Abstract]
Costs associated with remediation	$ 10,000
Allocated share of remediation costs	$ 132

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- Definition

Allocated share of remediation costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	nnbr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

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Namespace Prefix:	nnbr_
Data Type:	xbrli:stringItemType
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- Definition

Costs associated with remediation.

+ References

No definition available.

+ Details

Name:	nnbr_CostsAssociatedWithRemediation
Namespace Prefix:	nnbr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration