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Acquisitions and Dispositions - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 29, 2016 | Mar. 17, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 588,585 | $ 199,703 | $ 591,047
Total purchase price, net of cash and cash equivalents acquired |  |  | 939,591 | $ 9,910 |
Newport [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current assets (including cash) | $ 186,137 |  |  |  |
Inventory | 142,714 |  |  |  |
Intangible assets | 404,506 |  |  |  |
Goodwill | 396,027 |  | $ 396,027 |  |
Property, plant and equipment | 119,932 |  |  |  |
Long-term assets | 22,725 |  |  |  |
Total assets acquired | 1,272,041 |  |  |  |
Current liabilities | 95,156 |  |  |  |
Intangible liability | 4,302 |  |  |  |
Other long-term liabilities | 165,305 |  |  |  |
Total liabilities assumed | 264,763 |  |  |  |
Fair value of assets acquired and liabilities assumed | 1,007,278 |  |  |  |
Less: cash and cash equivalents acquired | (61,463) |  |  |  |
Total purchase price, net of cash and cash equivalents acquired | $ 945,815 |  |  |  |
Precisive, LLC [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current assets (including cash) |  | $ 693 |  |  |
Non-current assets |  | 18 |  |  |
Intangible assets |  | 5,110 |  |  |
Goodwill |  | 7,042 |  |  |
Total assets acquired |  | 12,863 |  |  |
Current liabilities |  | 343 |  |  |
Fair value of assets acquired and liabilities assumed |  | 12,520 |  |  |
Less: cash and cash equivalents acquired |  | (435) |  |  |
Total purchase price, net of cash and cash equivalents acquired |  | $ 12,085 |  |  |

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