XML 118 R101.htm IDEA: XBRL DOCUMENT
v3.20.4

Share-Based Compensation - Schedule of Performance Based Awards Goals with Respect to TSR and ROIC (Detail) | 2 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 12, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
TSR Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Threshold performance, percentage |  | 35.00% | 35.00% | 35.00%
Percentage of shares issuable based on threshold performance |  | 50.00% |  |
Target Performance, percentage |  | 50.00% | 50.00% | 50.00%
Percentage of shares issuable based on target performance |  | 100.00% |  |
Maximum Performance, percentage |  | 75.00% | 75.00% | 75.00%
Percentage of shares issuable based on maximum performance |  | 150.00% |  |
ROIC Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Threshold performance, percentage |  | 4.90% | 4.70% | 15.50%
Percentage of shares issuable based on threshold performance |  | 35.00% |  |
Target Performance, percentage |  | 5.10% | 5.80% | 18.00%
Percentage of shares issuable based on target performance |  | 100.00% |  |
Maximum Performance, percentage |  | 5.60% | 7.00% | 19.50%
Percentage of shares issuable based on maximum performance |  | 150.00% |  |
ROIC Awards | Subsequent Event |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Threshold performance, percentage | 6.70% |  |  |
Percentage of shares issuable based on threshold performance | 50.00% |  |  |
Target Performance, percentage | 7.90% |  |  |
Percentage of shares issuable based on target performance | 100.00% |  |  |
Maximum Performance, percentage | 8.70% |  |  |
Percentage of shares issuable based on maximum performance | 150.00% |  |  |

X
- Definition Share based compensation arrangement by share based payment award based on threshold performance achievement percentage. + References No definition available. + Details
Name: | nnbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardBasedOnThresholdPerformanceAchievementPercentage
Namespace Prefix: | nnbr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation arrangement by share based payment award percentage of shares issuable based on threshold performance. + References No definition available. + Details
Name: | nnbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfSharesIssuableBasedOnThresholdPerformance
Namespace Prefix: | nnbr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation arrangement by share-based payment award based on maximum performance achievement percentage. + References No definition available. + Details
Name: | nnbr_ShareBasedCompensationArrangementBySharebasedPaymentAwardBasedOnMaximumPerformanceAchievementPercentage
Namespace Prefix: | nnbr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation arrangement by share-based payment award based on target performance achievement percentage. + References No definition available. + Details
Name: | nnbr_ShareBasedCompensationArrangementBySharebasedPaymentAwardBasedOnTargetPerformanceAchievementPercentage
Namespace Prefix: | nnbr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation arrangement by share-based payment award percentage of shares issuable based on maximum performance. + References No definition available. + Details
Name: | nnbr_ShareBasedCompensationArrangementBySharebasedPaymentAwardPercentageOfSharesIssuableBasedOnMaximumPerformance
Namespace Prefix: | nnbr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation arrangement by share-based payment award, percentage of shares Issuable based on target performance. + References No definition available. + Details
Name: | nnbr_ShareBasedCompensationArrangementBySharebasedPaymentAwardPercentageOfSharesIssuableBasedOnTargetPerformance
Namespace Prefix: | nnbr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=nnbr_PerformanceSharesTsrAwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=nnbr_PerformanceSharesReturnOnInvestedCapitalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |