XML 54 R40.htm IDEA: XBRL DOCUMENT
v3.19.2

Acquisitions - Additional Information (Detail) | Aug. 09, 2018 | May 07, 2018 | Feb. 22, 2018
--- | --- | --- | ---
Paragon Medical Inc |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition percentage |  | 100.00% |
Bridgemedica, LLC |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition percentage |  |  | 100.00%
Southern California Technical Arts, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition percentage | 100.00% |  |

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

X
- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=nnbr_ParagonMedicalIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=nnbr_BridgemedicaLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=nnbr_SouthernCaliforniaTechnicalArtsInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |