Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2020	May 07, 2020
Document And Entity Information [Abstract]
Entity Registrant Name	NN INC
Entity Central Index Key	0000918541
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus (i.e. Q1,Q2,Q3,FY)	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		42,757,128
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false