| Cover Page | Aug. 05, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | NN, Inc. |
| Document Type | 8-K |
| Document Period End Date | Aug. 5, 2021 |
| Amendment Flag | false |
| Entity Central Index Key | 0000918541 |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 000-23486 |
| Entity Tax Identification Number | 62-1096725 |
| Entity Address, Address Line One | 6210 Ardrey Kell Road, Suite 600 |
| Entity Address, City or Town | Charlotte |
| Entity Address, State or Province | NC |
| Entity Address, Postal Zip Code | 28277 |
| City Area Code | 980 |
| Local Phone Number | 264-4300 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | NNBR |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
