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Preferred Stock and Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Apr. 15, 2020
Dec. 11, 2019
Nov. 01, 2019
Sep. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items]              
Class of warrant or right, number of securities called by warrants or rights (in shares)   1,500,000          
Class of warrant or right, exercise price of warrants or rights (in dollars per share)   $ 12.00     $ 12.00    
Proceeds from issuance of preferred stock         $ 0 $ 95,741 $ 0
Temporary equity, carrying amount         105,086 93,012  
Accrual of in-kind dividends         $ 13,000    
Number of shares of common stock sold (in shares)     14,400,000 14,400,000      
Public offering price per share (in dollars per shares)       $ 16.00      
Net proceeds to NN from the offering       $ 217,300      
Common Stock              
Subsidiary, Sale of Stock [Line Items]              
Number of shares of common stock sold (in shares)             14,375,000
Series C Preferred Stock              
Subsidiary, Sale of Stock [Line Items]              
Class of warrant or right, exercise price of warrants or rights (in dollars per share) $ 31.50            
Purchase right, beneficial owner threshold, percentage 15.00%            
Series C Preferred Stock | Common Stock              
Subsidiary, Sale of Stock [Line Items]              
Class of warrant or right, exercise price of warrants or rights (in dollars per share) $ 0.001            
Purchase right, number of shares called by each right (in shares) 1            
Series B Convertible Preferred Stock              
Subsidiary, Sale of Stock [Line Items]              
Temporary equity, liquidation price per share (in dollars per share)   $ 1,000          
Proceeds from issuance of preferred stock   $ 95,700          
Temporary equity, dividend rate, percentage         10.625%    
Temporary equity, carrying amount         $ 105,086 93,012 $ 0
Accrual of in-kind dividends         $ 11,121 $ 590  
Series B Convertible Preferred Stock | Private Placement              
Subsidiary, Sale of Stock [Line Items]              
Sale of stock, number of shares issued in transaction (in shares)   100,000          
Temporary equity, par value (in dollars per share)   $ 0.01          
Sale of stock, price per share (in dollars per share)   $ 1,000