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Acquisitions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Aug. 29, 2014 Autocam [Member] | Sep. 30, 2014 Autocam [Member] | Sep. 30, 2014 Autocam [Member] | Sep. 30, 2014 Autocam [Member] | Sep. 30, 2014 Autocam [Member] Third Quarter [Member] | Sep. 30, 2014 Autocam [Member] First Nine Months [Member] | Sep. 30, 2014 Rfk And Chelsea Grinding [Member] Customer Contracts and Trade Names [Member] | Sep. 30, 2014 Rfk And Chelsea Grinding [Member] Metal Bearing Components Segment [Member] | Jul. 15, 2014 Chelsea Grinding [Member] | Sep. 30, 2014 Chelsea Grinding [Member] | Jun. 20, 2014 RFK [Member] | Sep. 30, 2014 RFK [Member] | Sep. 30, 2014 RFK [Member] | Jan. 30, 2014 VS [Member] | Sep. 30, 2014 VS [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition |  |  |  |  |  |  |  | Aug. 29, 2014 |  |  |  |  |  | Jul. 15, 2014 |  |  | Jun. 20, 2014 |  | Jan. 30, 2014
Payments to acquire |  |  |  |  | $ 256,837 |  |  |  |  |  |  |  | $ 3,100 |  | $ 9,756 | $ 2,528 |  |  |
Debt and capital lease obligations |  |  |  |  | 29,160 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, consideration transferred in NN stock |  |  |  |  | 31,717 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan facility |  |  |  |  |  | 350,000 | 350,000 | 350,000 |  |  |  |  |  |  |  |  |  |  |
Business acquisition, transaction costs | 8,509 |  | 8,933 |  |  |  | 3,010 | 3,125 | 5,316 | 5,857 |  |  |  |  |  |  |  |  |
Business acquisition, deferred financing costs write off |  |  |  |  |  |  |  |  |  | 2,974 |  |  |  |  |  |  |  |  |
Increase in cost of sales |  |  |  |  |  |  |  |  | 1,992 | 1,274 |  |  |  |  |  |  |  |  |
Business combinations revenue during period from acquired business |  |  |  |  |  | 21,639 |  |  |  |  |  |  |  |  |  |  | 2,564 |  | 10,518
Business combinations net income during period from acquired business | (3,840) | 5,052 | 6,599 | 12,693 |  | 1,382 |  |  |  |  |  |  |  |  |  |  | 88 |  | (957)
Payments to Acquire Businesses | 20,995 |  | 20,995 |  | 401,060 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, transaction costs | 1,179 |  | 1,179 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  | 51,098 |  |  |  |  |  | 2,705 |  |  |  |  |  |  |  |
Goodwill from acquisition |  |  | 79,586 |  |  |  |  |  |  |  |  | 2,038 |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Weighted-Average Useful Life |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Revenue during period from acquired business |  |  |  |  |  |  |  |  |  |  |  |  | 500 |  |  |  |  |  |
Percentage of shares acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 79.20% | 99.70% | 99.70% |  |
Expected sales of acquired entity | 166,979 | 152,708 | 505,891 | 457,466 |  |  |  |  |  |  |  |  |  |  |  |  | 12,000 |  |
Non-controlling interest |  |  | (38) |  |  |  |  |  |  |  |  |  |  |  |  |  | 38 |  |
Percentage of shares owned by non controlling owners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.30% | 0.30% |  |
Operating assets acquired in cash |  |  | 259,504 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,580 |
Liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,968 |

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