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Quarterly Results of Operations (Unaudited) - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 02, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |
Merger and acquisition related costs before tax |  |  |  |  | $ 344 | $ 0 | $ 11,682
Loss on extinguishment of debt and write-off of unamortized debt issuance costs |  | $ 2,400 |  | $ 39,600 | 42,087 | $ 2,589 | $ 19,173
NN Life Sciences Vandalia LLC [Member] |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |
Merger and acquisition related costs before tax |  | 200 |  |  | 300 |  |
Merger and acquisition related costs after tax |  | 100 |  |  |  |  |
Net loss attributable to Vandalia acquisition |  | $ 500 |  |  |  |  |
Working capital adjustment and revisions | $ 300 |  |  |  |  |  |
Precision Bearing Components Group [Member] |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |
Merger and acquisition related costs after tax |  |  | $ 129,400 |  |  |  |
Working capital adjustment and revisions |  |  | $ 1,500 |  |  |  |
Discontinued operations final gain |  |  |  |  | $ 127,700 |  |

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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