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Acquisitions - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
May. 29, 2015
Sep. 30, 2014
Aug. 29, 2014
Jun. 20, 2014
Jan. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Business Acquisition [Line Items]                    
Intangible assets subject to acquisition           $ 57,226,000   $ 57,226,000    
Purchase price allocation, goodwill           85,447,000   85,447,000   $ 83,941,000
Business acquisition, transaction costs           3,948,000 $ 5,651,000 3,948,000 $ 7,080,000  
Items include transaction, integration, and financing related costs incurred             8,509,000   8,933,000  
Operating assets acquired in cash               $ 9,017,000 259,504,000  
Autocam [Member]                    
Business Acquisition [Line Items]                    
Date of acquisition               Aug. 29, 2014    
Payments to acquire     $ 256,837,000              
Purchase price allocation, property plant and equipment     146,120,000              
Intangible assets subject to acquisition     51,098,000              
Purchase price allocation, goodwill     77,548,000              
Business acquisition, debt and capital lease obligations     29,160,000              
Business acquisition, consideration transferred in NN stock     31,717,000              
Loans payable     $ 350,000,000              
Goodwill expected to be deducted for tax purpose           0   $ 0    
Business acquisition, transaction costs             5,316,000   5,857,000  
Business acquisition, deferred financing costs write off             2,974,000   2,974,000  
Increase in cost of sales             1,992,000      
Items include transaction, integration, and financing related costs incurred             $ 3,010,000   $ 3,125,000  
Caprock [Member]                    
Business Acquisition [Line Items]                    
Date of acquisition               May 29, 2015    
Payments to acquire $ 9,000,000                  
Purchase price allocation, net working capital 1,452,000                  
Purchase price allocation, property plant and equipment 2,960,000                  
Intangible assets subject to acquisition 2,490,000         $ 2,490,000   $ 2,490,000    
Purchase price allocation, goodwill $ 2,099,000                  
VS [Member]                    
Business Acquisition [Line Items]                    
Date of acquisition               Jan. 30, 2014    
Operating assets acquired in cash         $ 5,580,000          
Liabilities assumed         $ 2,968,000          
RFK [Member]                    
Business Acquisition [Line Items]                    
Date of acquisition               Jun. 20, 2014    
Payments to acquire   $ 2,528,000   $ 9,756,000            
Percentage of shares acquired       79.20%            
Maximum [Member] | RFK [Member]                    
Business Acquisition [Line Items]                    
Percentage of shares acquired   99.70%         99.70%   99.70%