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Fair Value Measurements - Summary of Fair Value Estimates for Financial and Nonfinancial Assets and Liabilities Measured at Fair Value on Nonrecurring basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Oct. 02, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Vandalia property, plant and equipment | $ 14,000 |  |  | $ 58,100
Vandalia intangible assets subject to amortization | 6,900 |  |  |
Vandalia goodwill | 454,612 |  | $ 443,529 | $ 448,399
NN Life Sciences Vandalia LLC [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Vandalia current assets | 10,166 | $ 10,166 |  |
Vandalia property, plant and equipment | 13,981 | 13,981 |  |
Vandalia intangible assets subject to amortization | 6,900 | 6,900 |  |
Vandalia other non-current assets | 29 | 29 |  |
Vandalia goodwill | 9,452 | 9,452 |  |
Vandalia non-current liabilities | (1,794) | (1,794) |  |
Net assets acquired | 38,734 | $ 38,734 |  |
Significant Unobservable Inputs (Level 3) [Member] | NN Life Sciences Vandalia LLC [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Vandalia current assets | 10,166 |  |  |
Vandalia property, plant and equipment | 13,981 |  |  |
Vandalia intangible assets subject to amortization | 6,900 |  |  |
Vandalia other non-current assets | 29 |  |  |
Vandalia goodwill | 9,452 |  |  |
Vandalia non-current liabilities | (1,794) |  |  |
Net assets acquired | $ 38,734 |  |  |

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