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Early Retirement Program (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Postemployment Benefits, Period Expense | $ 1,200
Postemployment Benefits, Future Expense | 500
Postemployment Benefits, Total Expense | $ 1,700

X
- Definition Expense related to postemployment benefits expected to be incurred. + References No definition available. + Details
Name: | nnbr_PostemploymentBenefitsFutureExpense
Namespace Prefix: | nnbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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