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Early Retirement Program (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($)
Restructuring and Related Activities [Abstract]
PostemploymentBenefitsTotalExpense	$ 1,600
Postemployment Benefits, Period Expense	$ 200

X

- Definition

The total expense, both incurred and future, to be incurred related to postemployment benefits.

+ References

No definition available.

+ Details

Name:	nnbr_PostemploymentBenefitsTotalExpense
Namespace Prefix:	nnbr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Period expense related to postemployment benefits.

+ References

No definition available.

+ Details

Name:	us-gaap_PostemploymentBenefitsPeriodExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_RestructuringAndRelatedActivitiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration