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Equity Offering - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
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Jul. 01, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Equity Offering [Abstract] |  |  |  |
Number of shares of common stock sold | 7,590,000 |  |  |
Public offering price per share | $ 24.00 |  |  |
Net proceeds to NN from the offering | $ 173,100 |  |  |
Repayment of term loan and ABL facilities | $ 148,700 | $ 314,313 | $ 55,000 | $ 401,438

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- Definition The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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