Equity Offering - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended	9 Months Ended
	Jul. 01, 2015	Sep. 30, 2015	Sep. 30, 2015
Equity Offering [Abstract]
Number of shares of common stock sold	7,590	7,590
Public offering price per share	$ 24.00
Net proceeds to NN from the offering	$ 173,052
Repayment of term loan and ABL facilities		$ 148,739	$ 149,530