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v3.25.2

Early Retirement Program (Details) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2025 USD ($)
Restructuring and Related Activities [Abstract] |
PostemploymentBenefitsTotalExpense | $ 1,600
Postemployment Benefits, Period Expense | $ 400

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