XML 83 R71.htm IDEA: XBRL DOCUMENT
v3.21.2

Net Income (Loss) Per Common Share - Additional Information (Detail) - $ / shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Earnings Per Share [Abstract] |  |  |  |
Antidilutive securities excluded from computation of earnings per share, minimum price range (in dollars per share) | $ 7.93 | $ 7.93 | $ 7.93 | $ 7.93
Anti dilutive securities excluded from computation of earnings per share, maximum price range (in dollars per share) | $ 25.16 | $ 25.16 | $ 25.16 | $ 25.16

X
- Definition Antidilutive securities excluded from computation of earnings per share maximum price range one. + References No definition available. + Details
Name: | nnbr_AntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareMaximumPriceRangeOne
Namespace Prefix: | nnbr_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Antidilutive securities excluded from computation of earnings per share minimum price range. + References No definition available. + Details
Name: | nnbr_AntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareMinimumPriceRange
Namespace Prefix: | nnbr_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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