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Acquisitions - Summary of Final Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 02, 2017 | Oct. 19, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017
Consideration: |  |  |  |  |
Property, plant and equipment |  |  |  | $ 58,100 | $ 14,000
Intangible assets subject to amortization |  |  |  |  | 6,900
Goodwill |  |  | $ 443,529 | 448,399 | 454,612
NN Life Sciences Vandalia LLC [Member] |  |  |  |  |
Consideration: |  |  |  |  |
Cash paid | $ 38,700 |  |  |  |
Current assets | 10,166 |  |  |  | 10,166
Property, plant and equipment | 13,981 |  |  |  | 13,981
Intangible assets subject to amortization | 6,900 |  |  |  | 6,900
Other non-current assets | 29 |  |  |  | 29
Goodwill | 9,452 |  |  |  | 9,452
Total assets acquired | 40,528 |  |  |  |
Current liabilities | 1,794 |  |  |  |
Total liabilities assumed | 1,794 |  |  |  | 1,794
Net assets acquired | $ 38,734 |  |  |  | $ 38,734
Precision Engineered Products Group [Member] |  |  |  |  |
Consideration: |  |  |  |  |
Cash paid |  |  | 621,196 | 621,196 |
Cash adjustment |  |  | (1,635) |  |
Total consideration |  |  | 619,561 | 621,196 |
Current assets |  |  | 69,783 | 69,331 |
Property, plant and equipment |  |  | 55,201 | 56,163 |
Intangible assets subject to amortization |  |  | 240,490 | 240,490 |
Other non-current assets |  |  | 1,500 | 1,500 |
Goodwill |  |  | 370,904 | 372,709 |
Total assets acquired |  |  | 737,878 | 740,193 |
Current liabilities |  |  | 21,354 | 21,354 |
Non-current deferred tax liabilities |  |  | 94,755 | 95,435 |
Other non-current liabilities |  |  | 2,208 | 2,208 |
Total liabilities assumed |  |  | 118,317 | 118,997 |
Net assets acquired |  |  | $ 619,561 | $ 621,196 |
Precision Engineered Products Group [Member] | Subsequent Adjustments to Fair Value [Member] |  |  |  |  |
Consideration: |  |  |  |  |
Cash adjustment |  | $ (1,635) |  |  |
Total consideration |  | (1,635) |  |  |
Current assets |  | 452 |  |  |
Property, plant and equipment |  | (962) |  |  |
Goodwill |  | (1,805) |  |  |
Total assets acquired |  | (2,315) |  |  |
Non-current deferred tax liabilities |  | (680) |  |  |
Total liabilities assumed |  | (680) |  |  |
Net assets acquired |  | $ (1,635) |  |  |

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