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Restructuring and Integration - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Restructuring and Related Activities [Abstract] |  |  |  |
Restructuring and integration expense, net | $ 0 | $ 1,591,000 | $ (12,000) | $ 2,346,000
Pay period for accrued restructuring and integration costs |  |  | 1 year 7 months 25 days |
Restructuring and related cost, expected cost remaining | $ 500,000 |  | $ 500,000 |

X
- Definition Pay Period For Accrued Restructuring And Integration Costs + References No definition available. + Details
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Namespace Prefix: | nnbr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Restructuring and integration charges. + References No definition available. + Details
Name: | nnbr_RestructuringAndIntegrationCharges
Namespace Prefix: | nnbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of expected cost remaining for the specified restructuring cost. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant